Destination guide
Bangkok weather by month
December, January and November are the best months to visit Bangkok for a balance of heat and relatively little rain. December is the clearest choice, with daytime averages of 31°C and just 2 rainy days; January offers similarly manageable conditions. The catch is that Bangkok never really cools down. April reaches around 35°C, while the wetter months call for flexible outdoor plans rather than an expectation of dry days.
- Hottest month
- 34.6°CApril
- Coolest month
- 30.5°COctober
- Warmest sea
- 30.6°CMay
- Flight from London
- 12 h 42 minLong-haul (7 h+) · estimated
Bangkok, month by month
A little perspective
Bangkok through the year
Every month at a glance; "best" marks our three top months on warmth, dryness and sunshine.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| Januarybest | 31.0°C | 21.8°C | 27.0°C | 6.7 | 15 | 3 | 100% |
| February | 32.3°C | 23.5°C | 27.8°C | 7.5 | 14 | 3 | 100% |
| March | 33.6°C | 25.5°C | 29.0°C | 6.9 | 40 | 6 | 99% |
| April | 34.6°C | 26.7°C | 30.1°C | 5.5 | 71 | 11 | 100% |
| May | 33.3°C | 26.5°C | 30.6°C | 2.6 | 135 | 20 | 100% |
| June | 32.3°C | 26.0°C | 30.1°C | 1.5 | 130 | 22 | 100% |
| July | 31.7°C | 25.6°C | 29.5°C | 1.4 | 137 | 23 | 100% |
| August | 31.4°C | 25.4°C | 29.4°C | 1.1 | 147 | 24 | 100% |
| September | 30.9°C | 24.9°C | 29.4°C | 1.5 | 241 | 26 | 100% |
| October | 30.5°C | 24.1°C | 29.3°C | 3.0 | 194 | 21 | 100% |
| Novemberbest | 31.0°C | 23.1°C | 28.6°C | 5.2 | 42 | 6 | 100% |
| Decemberbest | 30.6°C | 21.7°C | 27.4°C | 5.9 | 10 | 2 | 99% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
When to go to Bangkok
For beach weather, look at months where the daytime average clears 25°C and rainy days stay low: January, February, March, April, May, June, July, August, September, October, November, December. September is the wettest month (241 mm, about 26 rainy days) and December the driest (10 mm). The sea is warmest in May at 30.6°C and coolest in January at 27.0°C.
Getting there
A direct flight from London Gatwick to Don Mueang International Airport (DMK, 21 km from Bangkok) takes roughly 12 h 42 min - long-haul (7 h+) by UK standards. Time-zone: Asia/Bangkok.
Records and extremes, 1991-2020
The hottest day recorded in Bangkok between 1991 and 2020 reached 39.3°C on 10 May 2010; the coldest fell to 12.5°C on 25 December 1999. In April one day in ten tops 37.2°C and about 98% of days pass 30°C; in October one night in ten drops to 23.2°C or below. The wettest single month of the period was September 2012 with 530 mm, against a September average of 241 mm.
Sunrise, sunset and daylight in Bangkok
Local time on the 15th of each month; daylight-saving rules as of 2020.
| Month (15th) | Sunrise | Sunset | Daylight | Sunshine/day |
|---|---|---|---|---|
| January | 06:45 | 18:09 | 11.4 h | 6.7 h |
| February | 06:42 | 18:23 | 11.7 h | 7.5 h |
| March | 06:25 | 18:28 | 12.0 h | 6.9 h |
| April | 06:05 | 18:31 | 12.4 h | 5.5 h |
| May | 05:51 | 18:37 | 12.8 h | 2.6 h |
| June | 05:51 | 18:46 | 12.9 h | 1.5 h |
| July | 05:58 | 18:50 | 12.9 h | 1.4 h |
| August | 06:05 | 18:40 | 12.6 h | 1.1 h |
| September | 06:07 | 18:20 | 12.2 h | 1.5 h |
| October | 06:09 | 17:59 | 11.8 h | 3.0 h |
| November | 06:18 | 17:47 | 11.5 h | 5.2 h |
| December | 06:34 | 17:53 | 11.3 h | 5.9 h |
November to February: the easiest weather for exploring
November marks a useful shift towards drier weather, making it a good choice if rain would disrupt your plans. December and January offer the most comfortable balance: days remain hot, but nights average 22°C, giving evenings more relief than in spring. December is the driest month, while January is almost as dependable for outdoor time. February stays relatively dry and has the most sunshine, averaging 8 hours a day, though warmer nights make it less cooling after dark. This period suits travellers who want to spend plenty of time outside. Pack light clothing and sun protection, and still leave room for breaks from the midday heat.
March and April: plan around the heat
March brings a noticeable rise in heat, with daytime averages of 34°C and nights that offer less relief than in winter. April is the hottest month, reaching around 35°C by day and staying at 27°C overnight. It is not simply a hotter version of the dry season: rain also becomes more frequent, so sunshine is less dependable than in February. These months suit travellers who tolerate heat well and can keep their days flexible. Aim for outdoor time earlier or later in the day, reserve midday for indoor breaks, and choose light, loose clothing. April is a poor fit if comfortable walking weather is your priority.
May to October: frequent rain, with little cooling
May starts the much wetter stretch, with 20 rainy days on average, so outdoor plans need alternatives. June stays hot as rain becomes more frequent, while July and August have the least sunshine, averaging just 1 hour a day. September is the wettest month, with rain recorded on an average of 26 days. October brings some easing, but it is still too rainy to treat as a reliably dry option. Its cooler daytime average of 30°C also shows the catch: wetter weather does not mean cool weather. This period suits flexible travellers who do not need long sunny spells. Carry rain protection and choose clothing that dries easily.
A little more detail
Bangkok weather FAQs
Plain answers, grounded in the averages.
What is the best time to visit Bangkok?
Judged on warmth, low rainfall and sunshine, the best months in Bangkok are December, January and November. April is the hottest month (average high 34.6°C) and October the coolest (30.5°C).
How many months a year is Bangkok over 25°C?
12 months in Bangkok average a daytime high of 25°C or more, and 12 average 20°C or more.
When is the rainy season in Bangkok?
September is the wettest month in Bangkok (241 mm on average) and December the driest (10 mm). Annual rainfall averages 1176 mm.
What is the hottest temperature recorded in Bangkok?
The hottest day recorded in Bangkok between 1991 and 2020 reached 39.3°C on 10 May 2010; the coldest fell to 12.5°C on 25 December 1999. Records come from daily data for 1991-2020, not from a single station's all-time history.
Which month has the most sunshine in Bangkok?
February has the most sunshine, averaging 8 hours a day, alongside just 3 rainy days. It is a strong option for outdoor plans, but daytime temperatures average 32°C, so more sunshine also means planning shade and indoor breaks.
Will I need warm clothes for Bangkok evenings?
Outdoor evenings are generally warm throughout the year. Average night temperatures range from 22°C in December and January to 27°C in April. Light clothing should cover most outdoor plans; a light layer is a practical option if you prefer more coverage.
Does the rainy season mean rain all day?
Frequent rainy days do not necessarily mean continuous rain, but the monthly figures cannot tell you how long individual showers will last. Expect outdoor plans to be less dependable from May to October, and keep indoor alternatives rather than relying on a particular dry window.
See also: Thailand weather by month · where else is hot in April
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Bangkok. Sea temperature from the nearest 5 km sea cell, 26.6 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C