Bangkok weather in September
September in Bangkok: sweltering, soaked, with very humid — one of the weakest months to visit.
#12 of 12 months in Bangkok · #570 of 604 destinations to visit in September · comfort 48/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Bangkok climate normals — September
| Daytime high | 31°C / 88°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 267 mm / 10.5 in | ⛈ soaked |
| Rainy days | 26 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 7.7 h/day | |
| Daylight | 12.2 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 60 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Bangkok in September — FAQ
- Is September a good time to visit Bangkok?
- September in Bangkok: sweltering, soaked, with very humid — one of the weakest months to visit. It ranks #12 of 12 months for Bangkok on SeasonMap's comfort score (48/100).
- What is the weather like in Bangkok in September?
- In September, Bangkok averages a daily high of 31.1°C and a low of 25.2°C, with about 266.5 mm of rain over roughly 26.2 rainy days.
- What is the air quality in Bangkok in September?
- Bangkok has a mean US Air Quality Index of about 60 in September.