Hot in Sep
33°C average high
avg high · 18° at night
25°C+ on almost every day · often 35°C+
Thailand
Bangkok weather in September
Is it warm? Yes. September in Bangkok is hot: afternoons average 31°C and nights 25°C. Most days (80%) peak between 29°C and 33°C.
Hot · average high
31°C
25°C or more on almost every day.
- Average low25°overnight
- Sea—inland
- Rainy days24300 mm in the month
- SkyMostly cloudy90% cloud · 0% clear days
How warm it really gets
Every September afternoon from 2011–2025: 450 days. Most (80%) peaked between 29° and 33°.
September, year by year
The average September high in each year. The warmest, 2024, averaged 32°C; the coolest, 2021, 30°C.
Compared with home
Average September highs. Expect rain on about 24 days (300 mm in a typical month).
- Bangkok31°
- London19°
- Manchester17°
- Dublin17°
- Cork17°
- Belfast16°
- Glasgow16°
Warmer in September, not much further
Flying times are estimates from Dublin; Bangkok is about 12h 30m.
Hot in Sep
32°C average high
avg high · 20° at night
25°C+ on almost every day
Very hot in Sep
37°C average high
avg high · 27° at night
25°C+ on almost every day · often 35°C+
Air: ERA5 reanalysis via Open-Meteo, 2011–2025. Rainy day = 2 mm or more. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology