September · Thailand
Best time to visit Bangkok in September Weather, crowds & prices
Weather in Bangkok in September
Average temperature 28°C, 344 mm of rain, about 18 days with 6+ hours of sunshine and 86% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
3.1/10
Ranked #12 of 12 months
- Avg temp
- 28°C
- Rainfall
- 344 mm
- Humidity
- 86%
- Days with 6h+ sun
- 18
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Bangkok scores 3.1/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 28°C, 344 mm of rain, and roughly 18 days with 6+ hours of sunshine this month.
From January to March, Bangkok’s cooler dry season reveals glittering temples, sizzling street food, and tranquil canal life at their best.
September in Bangkok: expect compromises
Days in September average 28°C (82°F) and humidity near 86% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Expect monsoon-level rainfall at 344 mm: only about 18 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 3.1/10 on the same scale — 12th of 12 months, versus 8.3/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, December is materially better in Bangkok — 5.2 points higher on the same scale.
Frequently asked
- What is the weather like in Bangkok in September?
- In September, Bangkok averages 28°C, 344 mm of rain, and about 18 days with 6+ hours of sunshine. Its climate-comfort score is 3.1/10.
- Is September a good time to visit Bangkok?
- September earns a 3.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Bangkok in September?
- Expect about 344 mm of rain in September. Average humidity is 86% and there are about 18 days with 6+ hours of sunshine.
Curated in Bangkok
Tickets & experiences
Things to do in Bangkok
Bangkok, Thailand. Live activities and tours from GetYourGuide, matched to this destination.