Bangkok weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Poor
Best time to visit: November – February
What is the weather like in Bangkok in September?
In September, Bangkok is hot: daytime highs average 31 °C, and even at night it stays warm at around 25 °C. Expect around 4 hours of sunshine a day. It is the rainy season: rain falls on about 25 days, totalling 246 mm. On about 23 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is not an ideal month for a holiday in Bangkok.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 25 | 30 | 34 |
| Day | 32° | 31° | 31° |
| Night | 26° | 25° | 24° |
| Sun | 4 h | 4 h | 5 h |
| Rain days | 23 | 25 | 21 |
More details for September
- Daylight
- 12 h 13 min06:07 – 18:20
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 13 km/haverage daily peak
- Cloud cover
- 89 %on average
- Hot days
- 23 days30 °C or more
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 50 %51 %
- Sunshineweight 20 %22 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Bangkok in September: quick answers
Is Bangkok hot in September?
Yes. In September, Bangkok is hot: daytime highs average 31 °C and nights stay around 25 °C. On about 23 days the thermometer climbs to 30 °C or more.
Does it rain much in Bangkok in September?
It rains often – on about 25 days, adding up to 246 mm.
Bangkok month by month
The whole year in BangkokAll destinations: ThailandWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)