Bangkok weather in September
In September, Bangkok has an average high of 30 °C87 °F and an average low of 24 °C75 °F, with about 278 mm11 in of precipitation. It is the 8th warmest month of the year and the wettest.
How September compares with other months
Compared with August, September is about the same temperature and wetter by 97 mm3.8 in. Compared with October, September is about the same temperature and wetter by 75 mm2.9 in. Daylight lasts about 12.2 hours around the middle of the month. Average relative humidity is 85% and the average cloud amount 91%.
Is September a good time to visit Bangkok?
September is not among the most comfortable months by our comfort score: it is hot (average high 30 °C87 °F), it is fairly wet (278 mm11 in) and it is humid (85%). The most comfortable months in Bangkok are November and December.
What to wear in September
For Bangkok in September, pack very light, breathable clothing, a sun hat and plenty of water and a good rain jacket or umbrella and quick-drying shoes.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Bangkok | 3087 | 2475 | 27811 |
| Samut Prakan | 3086 | 2578 | 2519.9 |
| Khlong Luang | 3087 | 2475 | 27811 |
| Nakhon Pathom | 3187 | 2475 | 2359.2 |
| Ban I Chang | 3187 | 2476 | 2068.1 |
| Chon Buri | 3085 | 2476 | 29912 |
| Si Racha | 2984 | 2781 | 2399.4 |
| Pattaya | 2984 | 2781 | 2399.4 |
| Kanchanaburi | 3187 | 2475 | 2208.6 |
Other months in Bangkok
- January33 °C91 °F / 20 °C68 °F
- February35 °C95 °F / 22 °C72 °F
- March36 °C97 °F / 24 °C76 °F
- April36 °C97 °F / 25 °C78 °F
- May33 °C92 °F / 25 °C78 °F
- June32 °C89 °F / 25 °C77 °F
- July31 °C88 °F / 24 °C75 °F
- August31 °C88 °F / 24 °C75 °F
- September30 °C87 °F / 24 °C75 °F
- October30 °C86 °F / 24 °C74 °F
- November30 °C86 °F / 21 °C71 °F
- December31 °C87 °F / 19 °C67 °F
Frequently asked questions
How warm is Bangkok in September?
In September the average high in Bangkok is 30 °C (87 °F) and the average low is 24 °C (75 °F).
Does it rain a lot in Bangkok in September?
On average about 278 mm (10.9 in) of precipitation falls in September; it ranks 1st of the 12 months.
Is September the warmest month in Bangkok?
No. The warmest month in Bangkok is March, with an average high of 36 °C (97 °F). The coldest month is December, with an average low of 19 °C (67 °F).
How long is the day in Bangkok in September?
In the middle of September the day in Bangkok lasts about 12.2 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Bangkok in September?
The average relative humidity in September is about 85%. Combined with warm days, it can feel muggy.
How cloudy is Bangkok in September?
On average about 91% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.