Bangkok Weather in September
In September, Bangkok averages a high of 33°C (91°F) and a low of 25°C (77°F), from 48 years of daily records (1971–2026).
33°C
Average high
91°F
25°C
Average low
77°F
37°C
Record high
99°F · September 21, 2015
22°C
Record low
71°F · September 25, 2002
What September Is Like in Bangkok
- 6 of the 10 warmest Septembers on record in Bangkok have come since 2011.
- A typical September brings 2.6 days above 35°C (95°F).
- September is the wettest month of the year in Bangkok, averaging 355 mm of rain.
- September in Bangkok has become 0.9°C (1.6°F) warmer on average: the 2011–2025 average against 1970–1989.
At least 1 mm of rain falls on 65% of September days, and the month averages 355 mm in total.
Warmest: 2014 (34.2°C)Latest: 2025 (32.8°C)10-year averageLong-run average (32.9°C)
Look Up a Day in September
See the weather in Bangkok on any September date, year by year.
Source: NOAA GHCN-Daily, Bangkok Metropolis (1971–2026). Averages cover 1971–2026. How we compute this