Bangkok weather in September
Bangkok averages 31°C by day and 25°C at night in September and about 296 mm of rain in the month.
Day
31°C
Night
25°C
Sea
n/a
Rain
296 mm
Flight from London
11½h
What September feels like
September is hot but wet in Bangkok: rainy season, so pack for showers.
It is rainy season: about 296 mm of rain falls in the month.
That is 11°C warmer than an average September day in London.
Of the 56 sun destinations we track, Bangkok is the #12 warmest in September.
Going to Bangkok in September?
Share the TikToks and Instagram Reels you've saved for Bangkok to Dream Trip. It finds the places, pins them on a map and builds your days around them.
Want it warmer in September?
These are hotter than Bangkok this month for at most an hour and a half more flying:
Bangkok weather by month
September is highlighted. Compare with August and October, or see the full year in Bangkok.
Bangkok in September: quick answers
Is Bangkok hot in September?
September is hot but wet in Bangkok: rainy season, so pack for showers. Average highs are 31°C and lows 25°C.
Does it rain in Bangkok in September?
It is rainy season: about 296 mm of rain falls in the month.
What is the warmest month in Bangkok?
April, at an average high of 34°C. The coolest is October at 31°C.
How long is the flight to Bangkok from the UK?
About 11½h direct from London, estimated from the 9,555 km distance. Check your airline for exact times.
Still choosing? See where is hot in September for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in September from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. Rain is the average monthly total. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Bangkok in September?
Save the restaurants, beaches and views you find on TikTok and Instagram for Bangkok straight to a map, then let Dream Trip turn them into a day-by-day plan.
