Weather in Bangkok in August

A hard month. August asks something of you. Go in knowing what. You should expect rain on 25 days of the month, which is more days wet than dry.

August ranks 8 of 12 in Bangkok: past the worst of the year but short of December, which is the month to book if the dates are open.

Rain on 25 of the month's 31 days, 6 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 82% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 27 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest August day reached 35.7 °C and the coldest night fell to 22 °C, and the wettest single day dropped 32 mm — roughly 18% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 312 mm against 101 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 181 mm average is a reasonable planning figure, not a promise.

Wind is light at 7.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 31.7 °C in July, 31.5 here, 30.6 in September. Nothing about the timing within the month matters much.

Daylight in August

Bangkok sits close enough to the equator that daylight barely moves all year — 12.6 hours in August, against a range of just 1.6 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 17.1 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Bangkok versus nearby

If Bangkok is one option among several, the nearby comparison is worth making. Lat Krabang is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Hua Hin is close enough to be a coin toss — within a degree on temperature, 4 days more rain.

So: August is a compromise. December is 36 points better and is what Bangkok is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Bangkok

See all twelve months in Bangkok, or where else to go in August.