Weather in Bangkok in August

How August compares

August is the 7th warmest month of the year in Bangkok and ranks 21st of 134 destinations we compare for August - see where else is hot in August. Within Thailand it is 1st of 6 (Thailand in August). Against London's average high of 21.4°C in August, Bangkok is 10.0°C warmer by day and 11.9°C warmer at night.

Daytime and night-time in August

The typical August day in Bangkok peaks at 31.4°C, but that is an average: the warmest 10% of days reach 33.3°C or more. About 100% of days top 25°C and almost every pass 30°C. Nights average 25.4°C; one night in ten drops to 24.7°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest August day here reached 36.5°C (2020-08-27) and the coldest night 23.7°C (2018-08-28).

Rain in August

Wet (more than 8 rainy days): about 24 days with 1 mm or more, 147 mm in total. Year to year it varies a lot - the wettest August was 1995 with 240 mm, the driest 2004 with 76 mm. Humidity averages 79%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in August

The sea averages 29.4°C - warm enough to swim (22°c+). Depending on the year it ranges from 28.9°C to 29.8°C. For the warmest sea here, come in May (30.6°C).

Sunshine and daylight

Around 1.1 hours of sunshine a day (estimated from cloud cover), 12.5 hours of daylight: the sun rises about 06:05 and sets about 18:40 local time in mid-August. Average cloud cover is 91%.

Is August a good time to visit Bangkok?

It is a reasonable choice: hot days but expect showers. The best months for Bangkok on our scoring are December, January, November; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Hot days and warm nights need a slower pace

Expect a noticeable step up from a British summer: Bangkok's average daytime high is 10°C above London's August average. With 84% of days reaching 30°C, heat is something to plan around, not an occasional inconvenience. Loose, lightweight clothing and regular breaks somewhere cool will make time outdoors more comfortable, especially around midday. Average night lows of 25°C mean evenings remain warm rather than offering a proper cool-down. Choose accommodation with air conditioning if you struggle to sleep in heat, and pack breathable evening clothes rather than expecting to need a warm layer outside. This is not a good fit if you prefer long, uninterrupted days on foot.

Plan for frequent rain, not dependable sunshine

About 24 rainy days make waterproofing your belongings and keeping plans changeable more useful than hoping to avoid rain altogether. Carry a compact umbrella and choose footwear that can cope with getting wet. There is about 1.1 hours of sunshine within 12.5 hours of daylight, so long days do not translate into much bright sun. Keep outdoor plans flexible rather than assuming rain will leave a particular part of the day clear. August can still work if you are happy to switch indoors when needed, but it is a poor match for a holiday built around clear skies and dry weather. Cloudier conditions do not remove the heat.