Bangkok in September
avoid · ruled out this year · the wettest month of the year
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The numbers
| Daily high | 31°C |
|---|---|
| Nightly low | 25°C |
| Feels like, afternoon | 35°C |
| Rainy days | 24 · 270 mm |
| Humidity | 83% |
| Sunshine | 8.4 h/day |
| Daylight | 12.1 h/day |
| Crowds | 100 / 100, higher is quieter |
Ten-year averages for this calendar month. A rainy day is one with at least 2 mm.
What September is known for
- monsoon, moderate
Written by a language model from the climate figures; the numbers above are measured and win where the two disagree.
What to pack
- Summer clothes by day, highs around 31°C.
- Rain gear you will actually use: about 24 rainy days and 270 mm.
- Sun protection: about 8 hours of sunshine a day.
- Humidity averages 83%; breathable fabrics dry faster.
Each line is a threshold over the ten-year figures above, not advice from anywhere else.
Before you go
| Cost of living | very cheap — prices run about 31% of the United States' (World Bank, 2025) |
|---|---|
| Currency | Baht |
| Languages | Thai |
| Plugs | Type A and B and C and F, 220 V |
| Driving | On the left |
| Emergency | 191, 199, 1669 |
| Calling code | +66 |
| Travel advice | avoid all but essential travel to parts — UK Foreign Office, updated 2026-09-18 |
Health. Before you travel check that: your destination can provide the healthcare you may need you have appropriate travel insurance for local treatment or unexpected medical evacuation This is particularly important if you have a health condition or are pregnant. Emergency medical number Dial 191 and ask for an ambulance. Local number: 1669 Contact your insurance or medical assistance company quickly if … More.
Facts from Wikidata (CC0), the UK Foreign Office (Open Government Licence) and the World Bank, refreshed 2026-09-23. The advisory is written for British travellers; entry rules depend on your passport.
The other months at Bangkok
- January sweet spot
- February sweet spot
- March sweet spot
- April avoid
- May avoid
- June avoid
- July avoid
- August avoid
- September
- October avoid
- November ok
- December sweet spot
← August · All twelve months at Bangkok · October →
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