Weather in Bangkok in September 2025
Average weather
Average temperature in Bangkok in September
Going from a maximum of +35°C during the day to a minimum of +25°C during the night, the temperature in September averages around +33°C.
The average maximum temperature goes down 10% by the end of the month, compared with the beginning of the month, from +34°C to +33°C.
Is Bangkok warm or cold in September?
Bangkok is typically hot in September.
Maximum temperatures go down compared to the previous month from +33°C to +32°C. The minimum temperature also goes up from +26°C to +26°C.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
September is one of the coolest months in Bangkok, here is the comparison with other months:
Climate in Bangkok in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +33°C | +32°C | +32°C | ||||
| Min. temperature | ||||||
| +23°C | +23°C | +19°C | ||||
| Max. temperature | ||||||
| +38°C | +37°C | +37°C | ||||
| Rainfall | ||||||
| 141 mm | 232 mm | 186 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 75% | 79% | 79% | ||||
| Air pressure | ||||||
| 1006 HPa | 1007 HPa | 1009 HPa | ||||
| Sunny days | ||||||
| 0 | 0 | 1 | ||||
| Cloudy days | ||||||
| 1 | 1 | 5 | ||||
| Rainy days | ||||||
| 21 | 15 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +33°C in the day, the average maximum temperature lowers to +32°C. Prepare for more rain. Average rainfall goes from 141 mm to 232 mm. Humidity rises from 75% to 79%. The average wind speed doesn’t change much during September, staying around 1 m/s. The amount of sunny days stay about the same, averaging 0 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Bangkok is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Bangkok?
Climate Change over Years
The climate in Bangkok in September has not changed much over the last 43 years.
The average temperature was the lowest in 1985 (+32°C) and the highest in 2020 (+34°C). The driest year was 1979 with only 810 mm of rainfall, and the wettest year was 2018 with 1630 mm.
FAQ
Is September a good time to visit Bangkok?
Can you sunbathe in Bangkok in September?
Is Bangkok rainy in September?
Is it sunny in Bangkok in September?
Other cities in Thailand
Monthly weather in Bangkok
Source of the data
For this page, we’ve looked at the typical weather in Bangkok, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.