Planning a trip to Gili Trawangan often raises more weather-related questions than expected. Is it worth visiting during the rainy season? Can rough seas cause boat cancellations? Which month is best for snorkeling, and do you need to pack a light jacket?
Temperatures in Gili Trawangan remain warm throughout the year, but rainfall, humidity, wind, waves, and underwater visibility can vary considerably from one season to another. Choosing your travel dates based only on the daytime temperature may leave you with fewer opportunities for snorkeling, diving, cycling, or boat trips.
This detailed Gili Trawangan weather guide explains the dry and rainy seasons, monthly temperatures, sea conditions, recommended clothing, and weather risks to consider before booking your trip.
Understanding Gili Trawangan’s Climate
Gili Trawangan does not have four distinct seasons like many destinations in Europe, North America, or East Asia. Its tropical climate is generally divided into a dry season and a rainy season.
The dry season usually runs from May to October, while the rainy season generally lasts from November to March. April and October are transitional months, so conditions can vary from year to year.
Average daytime temperatures remain around 28°C to 31°C throughout most of the year. Nighttime temperatures typically range from approximately 23°C to 26°C.
Although the temperature difference between months may appear small, the actual weather can feel very different. High humidity during the rainy season can make the air feel hotter and heavier. During the dry season, strong sunshine is common, but lower humidity and coastal breezes can make shaded areas feel more comfortable.
Sea temperatures generally remain around 28°C to 30°C, making swimming and snorkeling possible throughout the year. However, warm water does not necessarily mean ideal snorkeling conditions. Heavy rain, strong wind, currents, and waves can reduce underwater visibility or cause tour schedules to change.
Gili Trawangan Monthly Weather Comparison
The figures below are general climate ranges intended to help compare different travel periods. Actual temperatures, rainfall, wind, and sea conditions will vary according to the year and specific travel dates.
| Month | Daytime Temperature | Night Temperature | Sea Temperature | Rainfall Pattern | General Conditions | Travel Rating | Main Weather Concerns |
|---|---|---|---|---|---|---|---|
| January | 28°C to 30°C | 24°C to 26°C | Around 29°C | Frequent and heavy rain | Hot and very humid | Fair to low | Heavy rain, thunderstorms, strong wind, rough seas |
| February | 28°C to 30°C | 24°C to 26°C | Around 29°C | Frequent showers | Humid and muggy | Fair to low | Boat delays, waves, tour cancellations |
| March | 29°C to 31°C | 24°C to 26°C | Around 29°C | Rain gradually decreases | Hot and humid | Fair | Sudden rain, lightning, changing sea conditions |
| April | 29°C to 31°C | 24°C to 26°C | 29°C to 30°C | Transitional weather | Hot and humid | Good | Intense sun, short heavy showers |
| May | 29°C to 31°C | 24°C to 26°C | Around 29°C | Noticeably less rain | Warm and relatively comfortable | Very good | UV exposure, heat, dehydration |
| June | 28°C to 30°C | 23°C to 25°C | 28°C to 29°C | Mostly dry and sunny | Pleasant in the morning and evening | Very good | Strong UV radiation, dry wind |
| July | 28°C to 30°C | 23°C to 25°C | Around 28°C | Dry-season conditions | Sunny and relatively comfortable | Very good | Strong sun, coastal wind, crowds |
| August | 28°C to 30°C | 22°C to 24°C | Around 28°C | One of the driest periods | Hot days and cooler evenings | Very good | UV exposure, dust, dry conditions |
| September | 29°C to 31°C | 23°C to 25°C | 28°C to 29°C | Mostly dry | Warm and generally comfortable | Very good | Midday heat, strong sunshine |
| October | 29°C to 32°C | 24°C to 26°C | Around 29°C | Transitional weather | Hot with rising humidity | Good | Showers, thunderstorms, heat |
| November | 29°C to 32°C | 24°C to 26°C | Around 29°C | Rain becomes more frequent | Very warm and humid | Fair | Heavy showers, lightning, waves |
| December | 28°C to 30°C | 24°C to 26°C | Around 29°C | Established rainy season | Humid with frequent rain | Fair to low | Heavy rain, boat delays, strong wind |
Gili Trawangan Dry Season Weather
The dry season in Gili Trawangan generally lasts from May to October. Rain is less frequent during this period, and visitors have a better chance of experiencing sunny conditions suitable for beach activities, cycling, snorkeling, and diving.
July through September is usually considered the most dependable period for outdoor activities. This makes these months particularly suitable for first-time visitors and travelers staying for only two or three nights.
However, dry-season weather does not guarantee calm seas every day. Strong winds can occasionally create higher waves and make fast-boat journeys uncomfortable. Snorkeling routes or departure times may also be changed according to currents and daily sea conditions.
July and August are popular travel months. Accommodation, diving programs, and group snorkeling tours may sell out earlier than usual. Travelers who want a beachfront room, a quieter property, or a specific diving schedule should book in advance.
May, June, and September are attractive alternatives for travelers who want a balance of favorable weather, manageable crowds, and potentially better accommodation availability.
Gili Trawangan Rainy Season Weather
The rainy season generally extends from November to March. December, January, and February tend to have higher humidity and a greater likelihood of heavy showers or thunderstorms.
A rainy-season visit does not necessarily mean continuous rain from morning to night. Some days begin with sunshine before a powerful afternoon shower arrives. On other days, cloudy periods may alternate with clear skies.
If you visit during the rainy season, schedule your most important outdoor activities in the morning. Keep the afternoon flexible for activities such as visiting a café, booking a massage, relaxing at your hotel, or exploring areas close to your accommodation.
Boat transportation is the most important consideration during this period. Strong winds and high waves can delay or cancel services between Gili Trawangan, Lombok, Bali, and the other Gili Islands.
Avoid leaving Gili Trawangan on the same day as an international flight. Spending the final night of your trip in Bali or on mainland Lombok provides a useful buffer in case your boat is delayed.
Gili Trawangan Weather by Month
Gili Trawangan Weather in January
January is one of the wettest months in Gili Trawangan. Daytime temperatures usually remain between approximately 28°C and 30°C, but high humidity can make the weather feel considerably warmer.
Rain may arrive as a short tropical downpour or continue for several hours. Thunderstorms and sudden gusts of wind can lead to snorkeling tour delays or cancellations. Heavy rainfall may also temporarily reduce underwater visibility near the shore.
Pack lightweight, quick-drying T-shirts, shorts, and a thin rain jacket. A rain jacket is often more practical than an umbrella because it leaves both hands free and is easier to use in windy weather.
A waterproof phone pouch or dry bag is strongly recommended for protecting passports, electronic devices, cameras, and other valuables.
The main weather concerns in January are intense rain, thunderstorms, strong wind, and rough sea conditions. Check the latest boat status before leaving your accommodation.
Gili Trawangan Weather in February
February remains part of the rainy season. Daytime temperatures generally range from 28°C to 30°C, while warm nights and high humidity can make sleeping uncomfortable in rooms without efficient air conditioning or ventilation.
Sunny periods and sudden downpours can occur on the same day. Sea conditions may also change quickly, so a day trip with a fixed return time can be less reliable than a stay of two or more nights.
Pack quick-drying clothing, non-slip sandals, a lightweight rain jacket, and a waterproof bag. Sunscreen is still necessary because UV exposure can remain high even when the sky appears cloudy.
Strong wind, high waves, and thunderstorms are the main concerns. Choose snorkeling and boat reservations with flexible rescheduling or weather-related cancellation policies.
Gili Trawangan Weather in March
March is the later part of the rainy season. Rain is still possible, but sunny periods usually become more frequent as the island approaches the dry season.
Daytime temperatures can reach approximately 29°C to 31°C. Combined with high humidity, this can make the middle of the day feel particularly hot.
Schedule snorkeling, cycling, and beach activities in the morning. Keep the afternoon flexible in case a shower or thunderstorm develops.
Lightweight T-shirts and shorts are suitable for most activities. Add a compact rain jacket and waterproof pouch for sudden showers.
The main risks are unexpected rain and lightning. If thunder continues after the rain appears to stop, wait before returning to the water.
Gili Trawangan Weather in April
April is a transitional month between the rainy and dry seasons. Sunny and hot conditions become more frequent, although short tropical showers can still occur.
Temperatures are commonly around 29°C to 31°C. Humidity may remain high, especially on days with little wind.
Rainfall is generally lower than during the main rainy season, but individual showers can still be intense. Allow additional time between outdoor activities, particularly if you need to travel across the island by bicycle or on foot.
Pack breathable summer clothing, swimwear, a rash guard, and a thin long-sleeved shirt. A lightweight rain jacket remains useful.
The main concerns are intense UV exposure, heat, and short heavy showers. Take regular breaks in the shade and drink water throughout the day.
Gili Trawangan Weather in May
May marks the beginning of a relatively dry and stable period. Daytime temperatures generally remain around 29°C to 31°C, while lower humidity can make conditions feel more comfortable than during the rainy season.
This is a good month for travelers who want favorable weather before the busiest part of the dry-season travel period. Snorkeling, diving, cycling, and sunset activities can usually be combined within the same itinerary.
Occasional showers remain possible, so it is still worth carrying a small waterproof pouch when leaving your hotel.
Pack T-shirts, shorts, a lightweight long-sleeved shirt, and a rash guard. A hat and sunglasses will provide essential protection during midday.
Strong sunshine and dehydration are the main concerns. Try to avoid extended exposure between approximately 11 a.m. and 3 p.m.
Gili Trawangan Weather in June
June offers relatively dry weather and frequent sunshine. Daytime temperatures usually range from 28°C to 30°C, while mornings and evenings may feel more comfortable due to coastal breezes.
This is an excellent period for snorkeling, diving, cycling around the island, and watching the sunset. Short-stay visitors also face a lower risk of losing an entire day of activities to heavy rain.
Prolonged dry conditions can create dusty paths, especially on unpaved sections of the island. Sunglasses are helpful when cycling, and valuables should be kept inside a closed bag.
Pack lightweight summer clothing, a rash guard, a broad-brimmed hat, sunglasses, and sunscreen. A thin long-sleeved shirt may be useful during breezy evenings.
Strong UV radiation and dry wind are the main weather considerations. Carry drinking water even if the breeze makes the air feel cooler.
Gili Trawangan Weather in July
July is in the middle of the dry season. Rainfall is relatively low, and there is a good chance of sunny weather suitable for beach and water activities.
Temperatures are generally between 28°C and 30°C during the day. Lower humidity can make shaded areas feel comfortable, while nighttime temperatures of approximately 23°C to 25°C may feel slightly cool after swimming.
July’s favorable weather attracts more visitors. Hotels, sunset-view rooms, snorkeling tours, and popular diving programs may need to be booked in advance.
Pack breathable summer clothing, a long-sleeved UV-protection shirt, sunglasses, and a hat.
The primary concerns are strong sunshine and persistent coastal wind. Sunburn can develop quickly during boat trips because the breeze reduces the sensation of heat.
Gili Trawangan Weather in August
August is one of the driest months in Gili Trawangan. Daytime temperatures usually range from 28°C to 30°C, while nighttime temperatures can fall to approximately 22°C to 24°C.
The island’s unpaved paths may become dusty after an extended period without rain. Sunglasses and a thin face covering can be useful when cycling through busier parts of the island.
Snorkeling and diving conditions are often favorable, but strong wind can still produce waves or currents. Travelers with limited swimming experience should not enter unfamiliar water alone.
Pack a hat, sunglasses, sunscreen, a lightweight long-sleeved shirt, and an optional thin layer for breezy evenings.
The main weather issues are UV exposure, dehydration, dust, and occasional strong winds.
Gili Trawangan Weather in September
September generally continues the stable dry-season pattern. Temperatures rise slightly, with daytime conditions often reaching approximately 29°C to 31°C.
The busiest July and August period may begin to ease, making September a good choice for travelers who want favorable weather with somewhat lower visitor numbers.
Beach time, snorkeling, diving, cycling, and sunset viewing can all fit comfortably into the same itinerary. However, midday heat can still be intense.
Pack breathable summer clothing, a rash guard, a hat, sunglasses, and a lightweight long-sleeved shirt.
The main concerns are strong UV radiation and heat during the middle of the day. Divide outdoor activities between the morning and late afternoon whenever possible.
Gili Trawangan Weather in October
October is a transition from the dry season to the rainy season. Temperatures may reach approximately 29°C to 32°C, while humidity gradually increases.
Conditions early in the month may resemble the dry season. Later in October, cloudy periods and sudden showers can become more frequent.
Even when it does not rain, limited wind and rising humidity may make the weather feel hotter than the temperature suggests.
Pack breathable summer clothing, extra shirts, a compact rain jacket, a waterproof pouch, and non-slip sandals.
The main concerns are afternoon showers, thunderstorms, high humidity, and heat exhaustion. Drink water regularly and avoid prolonged cycling during the hottest part of the day.
Gili Trawangan Weather in November
Rain becomes more frequent in November, and sea conditions may become less predictable. Daytime temperatures can reach 29°C to 32°C, with high humidity making conditions feel extremely warm.
A clear morning can be followed by a strong afternoon shower. Schedule your most important outdoor activity early and check whether your tour allows date changes.
Heavy rain may temporarily reduce underwater visibility near certain sections of the coast. Ask your snorkeling or diving operator about current water conditions before departure.
Pack quick-drying clothing, a waterproof bag, non-slip footwear, and a lightweight rain jacket.
Heavy showers, thunderstorms, gusty wind, and higher waves are the main weather risks. Leave the water immediately if you hear thunder.
Gili Trawangan Weather in December
December falls within the established rainy season. Daytime temperatures usually remain around 28°C to 30°C, while nights are warm and humid.
Rain is frequent, but it may not continue throughout the entire day. Some mornings begin with clear or partly cloudy conditions before heavier rain develops in the afternoon.
December can still be busy because of Christmas and New Year travel. The rainy season does not automatically guarantee low accommodation prices or quiet beaches.
Pack breathable summer clothing, a lightweight rain jacket, a thin long-sleeved layer, a dry bag, and non-slip sandals.
The main concerns are intense rainfall, wind, lightning, rough seas, and boat delays. Allow additional travel time if you have flights or fixed accommodation reservations after leaving the island.
Best Time to Visit Gili Trawangan for Good Weather
Travelers prioritizing sunshine and beach activities should consider June through September. Rain is generally less frequent, making it easier to organize snorkeling, diving, cycling, and sunset activities.
July and August can offer dependable weather but may also bring more visitors and stronger demand for accommodation.
May, June, and September are particularly useful alternatives for travelers looking for a balance of weather, availability, and crowd levels.
Best Time for Snorkeling and Diving
May through September is generally a practical period for snorkeling and diving because rainfall is lower and schedules may be less vulnerable to weather-related disruption.
However, underwater visibility is influenced by more than the season. Wind, currents, wave height, recent rainfall, and the specific dive or snorkeling location all affect conditions.
Ask your tour operator about the latest sea conditions before departure. Follow the guide’s instructions, wear a flotation vest if necessary, and stay within the designated snorkeling area.
Best Time for Lower Prices and Fewer Crowds
Travelers seeking a quieter experience can consider the rainy-season months, particularly outside Christmas, New Year, and major holiday periods.
Lower visitor numbers do not guarantee low prices on every date. Accommodation rates vary according to local holidays, weekends, room type, location, and booking demand.
If traveling during the rainy season, stay for at least three nights if possible. A longer visit makes it easier to move snorkeling or diving to another day if the weather changes.
Best Time for Families and First-Time Visitors
June through September is generally easier for families and first-time visitors because the risk of prolonged heavy rain and major schedule disruption is lower.
Families traveling with young children or older adults should still plan around midday heat. Schedule active sightseeing in the morning, rest at the hotel during the hottest hours, and return outdoors in the late afternoon.
Even during the dry season, spend your final night in Bali or mainland Lombok if you have an important international flight the following day.
Weather Conditions to Watch Out For
Heavy Rain and Thunderstorms
Short but intense tropical rain can occur during the rainy season. If thunder is audible, stop swimming and snorkeling even if the rainfall appears light.
Move to a proper building or covered area. Avoid waiting immediately beneath a large isolated tree during a thunderstorm.
Strong Wind and High Waves
Wind and waves can affect travel plans more than rainfall. The sky may look clear while the sea remains too rough for a comfortable crossing.
Travelers prone to seasickness should prepare appropriate personal medication in advance. Avoid heavy meals immediately before boarding and follow crew instructions throughout the journey.
Fast-Boat Delays and Cancellations
Boat services between Gili Trawangan, Bali, and Lombok may be delayed or canceled when sea conditions deteriorate.
Do not plan to travel from Gili Trawangan to the airport on the same day as an important international flight. Move to Bali or mainland Lombok at least one day earlier. During unstable rainy-season weather, a two-day buffer may be worth considering.
Strong UV Radiation
UV exposure can be intense during both the dry and rainy seasons. Cloud cover and coastal wind can make the sun feel weaker than it actually is.
Apply sunscreen before leaving your accommodation and reapply it after swimming or heavy sweating. Use a hat, sunglasses, a rash guard, and lightweight long sleeves for additional protection.
Humidity, Heat, and Dehydration
High humidity can make the body feel tired during the rainy season. During the dry season, wind may cause sweat to evaporate quickly, delaying the sensation of thirst.
Carry water and drink regularly. Avoid long cycling journeys or extended walks during the hottest part of the day.
Strong Currents
Calm-looking water can still contain strong currents. Avoid swimming long distances alone or moving beyond designated safe areas.
Wear a flotation vest during snorkeling if you are not a confident swimmer. Inform your guide about your swimming ability before entering the water.
What to Wear in Gili Trawangan
Your Gili Trawangan packing list should focus on breathable clothing, sun protection, and items that dry quickly.
Recommended clothing and travel essentials include:
- Lightweight, quick-drying T-shirts
- Breathable shorts or loose trousers
- A thin long-sleeved shirt
- Swimwear and a rash guard
- Non-slip sandals or water shoes
- A broad-brimmed hat
- Sunglasses
- Sunscreen
- A waterproof phone pouch
- A dry bag
- A compact rain jacket
- A reusable water bottle
- Extra lightweight clothing
- Personal medication
- Seasickness supplies for boat journeys
Walking and cycling are common ways to get around Gili Trawangan. Lightweight footwear with a secure grip is generally more practical than heavy shoes.
During the rainy season, prioritize fabrics that dry quickly. During the dry season, focus on sun protection and ventilation.
What to Check Before Your Trip
Monthly climate averages can help you select a travel period, but they cannot predict the exact weather for your trip.
Begin checking the local forecast three to seven days before departure. Check wind, waves, and boat updates again the day before traveling to or from the island.
Schedule snorkeling or diving in the middle of your stay rather than on your final day. If poor weather causes a cancellation, you may then have time to reschedule.
When booking accommodation, boat transfers, or tours during the rainy season, check the following conditions:
- Free cancellation deadline
- Refund policy for weather-related cancellations
- Date-change availability
- Alternative transport options after a boat cancellation
- Late check-in policy
- Procedures for accommodation changes caused by transport disruption
Conclusion
The best time to visit Gili Trawangan for dependable weather is generally between July and September. Travelers looking for favorable conditions with a better balance of availability and crowd levels should also consider May, June, or September.
Travel during the November to March rainy season is still possible. The key is to schedule important outdoor activities in the morning, keep part of the itinerary flexible, and leave sufficient time between your island departure and any important flight.
Packing appropriate clothing, waterproof storage, sun protection, and practical footwear will make both dry-season and rainy-season travel more comfortable.
Before confirming your reservations, consider your travel month, length of stay, desired activities, and tolerance for possible weather disruption. Choose flexible accommodation, transport, and tour conditions whenever your itinerary depends on boat travel.
