Bangkok Weather in September: Climate, Temperature & Travel Tips
Avg 29.3°C · 331mm rain — September is autumn in Bangkok.
- Avg high
- 33.1 °C
- Avg low
- 25.5 °C
- Avg
- 29.3 °C
- Precipitation
- 331 mm
Source: Open-Meteo Archive 2014–2023 · 10-year climate normals
Climate Overview
September in Bangkok, Thailand brings autumn conditions: average temperature 29.3°C, average high 33.1°C, average low 25.5°C. Monthly rainfall averages 331mm, making it a wet time of year.
Plan outdoor activities around midday heat with shade and frequent hydration.
What to Pack
- Lightweight breathable clothing; sun hat
- Sunscreen and ample hydration
- Compact umbrella and waterproof jacket
Best Things to Do
- Visit outdoor sights in early morning or late afternoon
- Air-conditioned museums and galleries
- Pool or waterfront activities
Pros and Cons of Visiting in September
Pros:
- Shoulder season often means smaller crowds and lower prices
Cons:
- Hot weather may limit midday outdoor activities
- Frequent rain — pack waterproof gear
Climate source: Open-Meteo Archive (2014–2023).
Colour = avg temperature · blue = cool · orange = warm
- 1 April 31.6°C
- 2 May 31.0°C
- 3 March 30.6°C
- 1 December 27.8°C
- 2 January 28.2°C
- 3 November 29.0°C
FAQ
01 What is the average temperature in Bangkok in September? +
The average is 29.3°C, with a high of 33°C and a low of 26°C.
02 What is Bangkok like to visit in September? +
It is autumn in Bangkok, which is hot — plan around midday heat.
03 Does it rain often in Bangkok during September? +
Average rainfall is 331mm, which is high — expect frequent rain.
04 What should I pack for Bangkok in September? +
Lightweight breathable clothing; sun hat; Sunscreen and ample hydration.
05 Is September a peak travel season for Bangkok? +
It is closer to off-season, with more reasonable prices and fewer crowds.
06 Where does this climate data come from? +
Monthly averages computed from Open-Meteo Archive 2014–2023 daily observations.
- Sources
- Open-Meteo Archive 2014-2023
- Updated
- 2026-04-17