Bangkok weather in September
September is one of the least pleasant months in Bangkok: highs of 30°C (87°F) and about 278 mm (10.9 in) of rain on average. Nights average 24°C (75°F) and cloud cover 91% (NASA POWER, 2001–2025 averages). It is the wettest month of the year and the 3rd coolest. Compared with August, it is cooler and wetter; October brings highs of 30°C (87°F) and 203 mm (8.0 in) of rain.
Is September a good time to visit Bangkok?
least pleasant month Weather score 35/100.
September is one of the least pleasant months for weather in Bangkok. For better conditions, consider Nov–Feb.
Does it rain a lot in Bangkok in September?
Yes, it is one of the rainy months: about 278 mm (10.9 in) falls in an average September. It is the wettest month of the year.
How warm is Bangkok in September?
Days average 30°C (87°F) and nights 24°C (75°F).
Bangkok weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 33°C (91°F) | 20°C (68°F) | 16 mm | 40% | best |
| February | 35°C (96°F) | 22°C (72°F) | 14 mm | 35% | best |
| March | 36°C (97°F) | 24°C (76°F) | 47 mm | 48% | fair |
| April | 36°C (97°F) | 26°C (78°F) | 75 mm | 61% | fair |
| May | 34°C (92°F) | 26°C (78°F) | 164 mm | 84% | least pleasant |
| June | 32°C (89°F) | 25°C (77°F) | 165 mm | 89% | least pleasant |
| July | 31°C (89°F) | 24°C (76°F) | 169 mm | 91% | fair |
| August | 31°C (88°F) | 24°C (75°F) | 181 mm | 92% | least pleasant |
| September | 30°C (87°F) | 24°C (75°F) | 278 mm | 91% | least pleasant |
| October | 30°C (87°F) | 24°C (74°F) | 203 mm | 78% | least pleasant |
| November | 30°C (87°F) | 22°C (71°F) | 39 mm | 59% | best |
| December | 31°C (87°F) | 19°C (67°F) | 10 mm | 47% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months