Haikou is a warm coastal destination where travelers can enjoy urban sightseeing, parks, historic neighborhoods, and seaside scenery throughout the year. However, the city’s weather changes more than many first-time visitors expect.
January and February can feel surprisingly cool when cloudy skies and coastal winds arrive. From May onward, temperatures and humidity rise quickly, while frequent rain and occasional tropical weather can affect outdoor plans.
Checking the average temperature alone is not enough when planning a trip. Rainfall patterns, humidity, wind, air conditioning, and possible tropical storms can all influence what you should pack and how you should organize your itinerary.
This guide explains Haikou weather by month, seasonal conditions, what to wear, and the best time to visit. It also includes practical booking tips for flights, hotels, and outdoor activities.
Haikou Weather Overview
Haikou has mild winters and hot, humid summers. Rainfall generally increases from May and remains relatively high through October. September is usually one of the wettest months of the year.
Daytime temperatures typically range from around 21°C to 22°C in winter and rise to approximately 32°C to 33°C in summer. Winter nights can fall to around 15°C, while summer nighttime temperatures often remain close to 25°C.
The most comfortable period for many travelers is from mid-November to March. Temperatures are milder, humidity is generally lower than in summer, and heavy rain is less likely to disrupt outdoor activities.
However, winter is not always sunny. Cloudy skies, light drizzle, and coastal winds can occasionally make the weather feel cooler than the thermometer suggests.
From May through October, travelers should prepare for heat, humidity, and sudden rain. Tropical storms can also affect the region during the warmer months, so flexible reservations are especially valuable.
Haikou Weather by Season
Spring Weather in Haikou: March to May
Spring begins with comfortable temperatures but becomes noticeably hotter and more humid as May approaches.
March usually feels warm during the day and slightly cooler in the morning and evening. April brings early-summer conditions, while May marks the beginning of the genuinely hot and rainy period.
A short-sleeved shirt with a light overshirt or cardigan works well in March. From April onward, breathable T-shirts, lightweight trousers, shorts, and summer dresses become more practical.
Rain becomes more frequent toward the end of spring. A compact umbrella and a light waterproof jacket are useful additions to your packing list, particularly for trips in May.
Summer Weather in Haikou: June to August
Summer in Haikou is hot, humid, and rainy. Average daytime highs are generally around 32°C to 33°C, while nighttime temperatures remain close to 25°C.
High humidity can make the weather feel hotter than the recorded temperature. Even short walks may feel tiring during the middle of the day, especially when there is little wind.
Sudden afternoon showers and thunderstorms are possible. Rain may be brief and intense, with bright sunshine returning soon afterward.
Wear breathable, quick-drying clothes and carry more spare clothing than you normally would. Hotels, shopping centers, restaurants, and vehicles may use strong air conditioning, so a light cardigan or overshirt is still useful.
Summer travelers should also monitor tropical weather updates. Flexible hotel reservations and activities with reasonable cancellation policies can reduce the financial risk of last-minute weather disruptions.
Autumn Weather in Haikou: September to November
September remains hot, humid, and rainy. It is often one of the most weather-sensitive months for outdoor sightseeing and coastal activities.
Conditions gradually improve during October, although early October can still feel like summer. By November, temperatures become milder and walking outdoors is generally more comfortable.
Summer clothes, a compact umbrella, and water-resistant shoes are recommended for September and early October. Later in the season, add a light long-sleeved shirt or jacket for mornings and evenings.
If you plan to visit in September or October, check the change and cancellation conditions for flights, ferries, hotels, and outdoor tours before paying.
Winter Weather in Haikou: December to February
Winter is mild compared with many destinations, but it is not consistently hot. Average daytime highs are generally around 21°C to 23°C, while nighttime temperatures can fall to approximately 15°C to 16°C.
Sunny afternoons can feel pleasantly warm. Cloudy days and strong coastal winds, however, may feel much cooler.
Do not rely on short-sleeved clothing alone. Pack long-sleeved tops, lightweight knitwear, long trousers, and a wind-resistant jacket. Travelers who are sensitive to cool weather may also appreciate a thin insulated jacket.
Layered clothing is the most practical option because indoor and daytime conditions can be considerably warmer than early mornings, evenings, and exposed seaside areas.
Haikou Weather by Month and What to Wear
The temperature ranges below are approximate long-term averages. Conditions can vary from year to year, so check the local forecast seven days before departure and again one or two days before your flight.
Haikou Weather in January
January is one of the coolest months in Haikou. Average temperatures are approximately 15°C to 21°C.
Afternoons are often mild enough for walking and sightseeing. Cloudy skies and northeasterly winds can nevertheless make the city feel cooler, particularly near the coast.
Rainfall is relatively limited compared with summer, but overcast weather and occasional light drizzle are possible. On cooler days, city attractions and cultural sites may be more comfortable than long visits to exposed beaches.
What to Wear in January
Pack long-sleeved shirts, a thin sweater or sweatshirt, a wind-resistant jacket, long trousers, and comfortable walking shoes.
Travelers who feel the cold easily may want to bring a lightweight insulated jacket. A small umbrella can also be useful for cloudy or drizzly days.
Layered outfits work best because indoor areas and sunny afternoons may feel considerably warmer.
Haikou Weather in February
February temperatures usually range from approximately 16°C to 22°C.
It becomes slightly warmer than January, but cloudy conditions and high humidity can still create a cool sensation. Morning fog, low cloud, and occasional light rain are possible.
A short-sleeved shirt may be comfortable during a warm afternoon. Temperatures can feel cooler after sunset, so travelers should carry a light outer layer.
Conditions often become warmer toward the end of the month, although temperature changes can vary considerably between years.
What to Wear in February
Bring both short-sleeved and long-sleeved shirts, a thin cardigan or sweater, a light windproof jacket, long trousers, and comfortable shoes.
Carry a compact umbrella. A wind-resistant outer layer is particularly useful for seaside walks, open terraces, and evening activities.
Haikou Weather in March
March temperatures are generally around 19°C to 26°C. The city begins to feel distinctly warmer, but mornings and evenings may remain comfortable and slightly cool.
Early March can still bring cloudy or mild conditions. Daytime temperatures rise more quickly later in the month, and sunny afternoons may feel hot during extended walks.
Rainfall is lower than in summer, although humidity gradually increases. Cloudy days and occasional showers are still possible.
March is often a convenient month for combining city sightseeing, parks, historic districts, and coastal drives without the extreme heat of summer.
What to Wear in March
Pack short-sleeved shirts for daytime use, a lightweight long-sleeved shirt, a cardigan or windbreaker, thin trousers, and comfortable walking shoes.
A hat, sunscreen, and compact umbrella are also recommended. Keep a light layer in your day bag for mornings, evenings, and air-conditioned spaces.
Haikou Weather in April
April temperatures generally range from approximately 22°C to 29°C.
The weather begins to feel like early summer, particularly during the second half of the month. Humidity increases, and daytime highs may approach or exceed 30°C on hotter days.
Sunshine can be strong, making the apparent temperature feel higher than the forecast suggests. Rainfall also begins to increase, with short and sometimes heavy showers becoming more likely.
Outdoor activities are most comfortable in the morning and late afternoon. The hottest hours can be reserved for lunch, museums, shopping centers, or cafés.
What to Wear in April
Choose breathable T-shirts, lightweight trousers, shorts, or a summer dress. Bring a thin shirt for heavily air-conditioned indoor spaces.
A hat, sunglasses, sunscreen, and compact umbrella are useful. Breathable walking shoes are preferable if your itinerary includes long periods outdoors.
Haikou Weather in May
May temperatures usually range from approximately 24°C to 32°C. This is when genuinely hot, humid, and rainy conditions become more established.
Even a short walk can result in heavy perspiration. After rainfall, temperatures may remain high, creating a warm and humid atmosphere rather than immediate relief.
Rainfall becomes noticeably more frequent. Afternoon showers and thunderstorms can disrupt outdoor plans, so an itinerary entirely dependent on good weather is not recommended.
Arrange major outdoor attractions for the morning and prepare indoor alternatives for later in the day.
What to Wear in May
Pack quick-drying T-shirts, shorts, lightweight trousers, or loose summer dresses. Bring spare clothing and extra socks.
A compact umbrella, waterproof pouch, sunscreen, hat, and well-ventilated shoes are useful. A thin cardigan can help in strongly air-conditioned buildings and vehicles.
Keep passports, electronics, and other valuable items in a water-resistant pouch or protected section of your bag.
Haikou Weather in June
June temperatures are generally around 25°C to 33°C. It is one of the hottest and most humid periods of the year.
Temperatures rise quickly in the morning and often remain high after sunset. Afternoon showers and thunderstorms can be intense, although they may not last all day.
Humidity can increase before a storm, making the air feel particularly heavy. Travelers should plan regular breaks, drink water frequently, and avoid overly ambitious walking itineraries.
Cloud cover does not eliminate the risk of strong ultraviolet exposure. Sunscreen remains necessary even when the sky appears overcast.
Tropical weather may begin to affect travel plans during this period. Monitor local forecasts and flight updates as your departure date approaches.
What to Wear in June
Choose moisture-wicking T-shirts, breathable shorts, thin summer trousers, and quick-drying clothing.
Bring extra clothes, spare socks, a wide-brimmed hat, sunglasses, sunscreen, a portable fan, and a compact umbrella or lightweight rain jacket.
A thin outer layer is also useful in aggressively air-conditioned hotels, shopping centers, restaurants, and vehicles.
Haikou Weather in July
July temperatures usually range from approximately 25°C to 33°C. Days are hot and humid, while nights often remain warm.
Strong sunshine can be followed by a sudden afternoon shower. Travelers should carry both sun protection and rain protection, even when the morning forecast appears favorable.
Periods of heavy rain and strong wind are possible when tropical systems affect the region. Flights, ferries, and outdoor activities may be delayed, rescheduled, or canceled.
Avoid connecting important activities too closely. Leaving extra time between transportation and tours makes it easier to manage weather-related changes.
What to Wear in July
Wear breathable, quick-drying T-shirts, shorts, or thin summer trousers. Pack extra underwear, clothing, and socks.
Bring shoes with good traction that can dry quickly, along with a hat, sunglasses, high-protection sunscreen, a sun umbrella, and a water-resistant bag or cover.
Plan outdoor sightseeing for the morning. Spend the hottest hours in museums, shopping centers, cafés, or other air-conditioned locations.
Haikou Weather in August
August temperatures are commonly around 25°C to 32°C. Conditions remain very hot, humid, and rainy.
Sunny periods and heavy showers can alternate throughout the day. A clear morning does not guarantee a dry afternoon.
Intense rain may temporarily make roads slippery or slow traffic. Allow more travel time if moving between distant attractions, the airport, ferry terminals, or scheduled activities.
Weather can change quickly near the coast. Check the latest forecast before beginning a long seaside walk, boat excursion, or other outdoor activity.
What to Wear in August
Pack thin, breathable T-shirts, shorts, summer dresses, extra clothing, and spare socks.
Quick-drying shoes, a waterproof pouch, umbrella or rain jacket, sunscreen, hat, and portable fan are recommended.
Avoid delicate leather footwear or shoes that become uncomfortable when wet. Footwear with reliable traction is more practical during heavy rain.
Haikou Weather in September
September temperatures generally range from approximately 24°C to 31°C.
Although it can be slightly cooler than July and August, the weather remains hot and humid. September is also one of the rainiest periods of the year.
Both short, intense showers and longer periods of rain are possible. Tropical weather may bring stronger winds, rough coastal conditions, and transportation delays.
Check operating conditions before visiting coastal attractions, arranging boat trips, or booking water-based activities. Avoid placing a weather-dependent tour on the final day of your trip.
Scheduling outdoor activities in the middle of your stay provides an opportunity to rearrange them if conditions become unsuitable.
What to Wear in September
Bring quick-drying T-shirts, lightweight shorts or trousers, extra clothing, spare socks, and a light waterproof jacket.
A compact umbrella, shoes with good traction, waterproof bag cover, sunscreen, and a thin shirt for air-conditioned spaces are also useful.
Choose flexible tours and hotel rates whenever possible, especially if your itinerary depends heavily on outdoor activities.
Haikou Weather in October
October temperatures usually range from approximately 22°C to 28°C.
Early October can still feel hot and humid, with rainfall and tropical weather remaining possible. Conditions generally become milder and more comfortable toward the end of the month.
Rain followed by coastal wind can make evenings feel cooler than expected. Daytime temperatures may still be suitable for short-sleeved clothing, but a thin outer layer is helpful after sunset.
October is a transitional month. Travelers visiting early in the month should pack for summer and rain, while late-October visitors may need an additional light jacket.
What to Wear in October
Pack T-shirts, a lightweight long-sleeved shirt, thin trousers or shorts, and a light windbreaker.
Comfortable walking shoes, a compact umbrella, hat, and sunscreen are recommended.
Keep both summer clothing and one light outer layer available because conditions can differ considerably between the beginning and end of the month.
Haikou Weather in November
November temperatures generally range from approximately 19°C to 25°C.
Humidity and temperatures decrease, making outdoor activities more comfortable. Walking tours, park visits, historic neighborhoods, and coastal drives become easier to enjoy.
Short-sleeved or thin long-sleeved shirts may be sufficient during the day. Cloudy weather, wind, and lower evening temperatures can still require a light jacket or cardigan.
Rain remains possible, but it is generally less disruptive than during summer and early autumn.
What to Wear in November
Pack both short-sleeved and long-sleeved tops, a lightweight shirt or cardigan, a light jacket, long trousers, and comfortable walking shoes.
A compact umbrella, hat, and sunscreen are still useful. Light layers provide the best flexibility between warm afternoons and cooler evenings.
Haikou Weather in December
December temperatures usually range from approximately 16°C to 22°C.
Afternoons are often mild, while mornings and evenings feel noticeably cooler. Coastal wind can make beaches and waterfront promenades feel colder than sheltered city streets.
Sunny weather is suitable for outdoor sightseeing, but cloudy skies and northeasterly winds can cause temperatures to fall quickly.
Heavy winter clothing is rarely necessary for most travelers. However, packing only summer clothing may leave you uncomfortable during cool or windy periods.
What to Wear in December
Bring long-sleeved shirts, a thin sweater, a light jacket or windbreaker, long trousers, and comfortable walking shoes.
Travelers who are sensitive to cool weather may want a thin insulated jacket. A compact umbrella is useful for occasional drizzle.
Wear layers that can be removed during warm afternoons and added again after sunset.
Best Time to Visit Haikou
Best Time for Comfortable Weather
Mid-November through March is generally the most comfortable period for sightseeing. Temperatures are milder, and heavy summer rain is less likely to interfere with outdoor plans.
November and March are suitable for travelers who prefer warmer conditions without the most intense summer heat. December through February may appeal to visitors who want cooler walking weather.
Winter visitors should still prepare for cloudy days, coastal wind, and occasional light rain.
Best Time for a Balance of Weather and Cost
Late March through April and November can offer a practical balance between comfortable weather and travel costs.
These periods are generally less intense than midsummer and less vulnerable to prolonged rain than the peak wet-season months.
April can become hot toward the end of the month. November hotel demand may also increase around holidays, weekends, or major local events, so compare several dates before booking.
Best Time for Budget-Conscious Travelers
Travelers may find appealing flight or hotel prices on selected dates between June and October. Lower prices, however, should be weighed against heat, heavy rain, and possible tropical weather.
A nonrefundable room may cost less at the time of booking, but it can create a larger loss if weather affects the trip. Compare the total cost of flexible and nonrefundable reservations before making a decision.
Check airline change fees, hotel cancellation deadlines, activity refund policies, and any travel insurance coverage relevant to weather-related delays.
Planning a Haikou Trip During the Rainy Season
The rainy season does not necessarily mean continuous rain every day. Many days include a mixture of sunshine, cloud, and short periods of heavy rain.
A flexible itinerary can make a rainy-season visit much easier. Schedule important outdoor attractions in the morning and keep shopping centers, museums, cafés, and other indoor destinations as afternoon alternatives.
Avoid filling every day with weather-dependent excursions. Leave at least one flexible period that can be used to reschedule a canceled tour or coastal activity.
When booking outdoor experiences, check whether the activity continues in rain, whether customers can change the date, and how refunds are handled if the operator cancels.
Haikou Seasonal Packing List
Packing for Winter and the Drier Months
- Long-sleeved T-shirts
- Thin sweater or cardigan
- Lightweight jacket or windbreaker
- Long trousers
- Comfortable walking shoes
- Compact umbrella
- Sunscreen
- Hat
- Light clothing for warmer afternoons
Packing for Summer and the Rainy Season
- Breathable, quick-drying T-shirts
- Lightweight shorts or trousers
- Spare clothing and socks
- Compact umbrella or rain jacket
- Water-resistant pouch
- Bag rain cover
- Quick-drying shoes with good traction
- Sunscreen
- Wide-brimmed hat
- Sunglasses
- Portable fan
- Reusable water bottle
- Insect repellent
- Thin layer for air-conditioned spaces
- Personal medication
Booking Flights, Hotels, and Activities
Weather should be considered alongside price when booking a trip to Haikou.
For flights, compare baggage allowances, date-change fees, cancellation conditions, and airline policies for weather-related disruptions. Leave sufficient time between separate flight or ferry reservations.
For hotels, check the final date for free cancellation, whether payment is taken in advance, and whether the reservation can be modified without a penalty.
For tours and outdoor activities, review the rain policy before booking. Activities that depend heavily on sea conditions or clear weather should ideally be scheduled earlier in the trip rather than on the final day.
Travel insurance may offer useful protection, but coverage varies. Read the policy wording carefully to understand whether weather-related delays, cancellations, additional accommodation, or missed connections are included.
Haikou Weather FAQ
What is the best month to visit Haikou?
November through March generally offers the most comfortable combination of mild temperatures and lower rainfall.
November and March are good options for travelers who want warmer weather. December through February is more suitable for those who prefer cooler conditions for walking and sightseeing.
Can I Wear Only Short-Sleeved Clothes in Haikou During Winter?
Short sleeves may be comfortable on a sunny afternoon, but they are not sufficient for every winter day.
Mornings, evenings, cloudy periods, and windy coastal locations can feel cool. Pack at least one long-sleeved top and a lightweight jacket.
Is Haikou Worth Visiting During the Rainy Season?
Yes, provided you prepare a flexible itinerary. Rain does not always continue throughout the entire day, and dry periods can still be suitable for sightseeing.
Combine outdoor attractions with indoor alternatives and choose reservations that allow date changes or cancellations.
Should I Pack an Umbrella or a Rain Jacket?
A compact umbrella is convenient for general city sightseeing. A lightweight waterproof jacket is more practical during windy conditions or longer outdoor activities.
Travelers visiting during the wettest months may benefit from carrying both.
What Should I Check During Tropical Storm Season?
Monitor airline updates, local weather warnings, hotel notices, ferry services, and tour operating conditions.
Confirm that your phone number and email address are correct in every reservation so airlines, hotels, and activity providers can reach you quickly.
Summary of Haikou Weather by Month
Haikou has a mild winter and a hot, humid summer. Mid-November through March is generally the most comfortable period for sightseeing, while May through October requires more preparation for heat and rain.
Bring long trousers and a lightweight jacket in January and February. Pack a mixture of short sleeves and light outer layers in March and April.
From May through September, prioritize breathable clothing, spare clothes, rain protection, quick-drying shoes, and waterproof storage for electronics and documents. October is transitional, while November usually brings more comfortable outdoor conditions.
Understanding Haikou weather by month and what to wear can help you avoid unnecessary luggage, select more suitable travel dates, and reduce the risk of weather-related disruption.
Once your dates are confirmed, check the latest forecast and compare flexible flights, hotels with free cancellation, and activities that offer reasonable weather policies.