Bangkok · AutumnMonth summary
Bangkok weather in September
⚠️ Fair
🌡️ Temperature min / max
25°C – 31°C
🌧 Rainy days
90% of days
☀️ Sunshine
8.6h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
5.7/10
📅 📅 Best month
December (8.2/10)
Quick decision
Should you visit Bangkok in September?
⚠️ Fair
✅ Yes if: you prefer off-season travel with reduced prices and very few tourists.
❌ No if: you want to avoid rain — more than half the days are rainy.
Our take: Bangkok in September is possible but December offers a score of 8.2/10 vs 5.7.
By trip type
Bangkok in September by trip type
- 🏙️ 🏙️ City break / culture : ⚠️ Possible
- 🚶 🚶 Outdoor activities : ❌ Not recommended
- 🏖️ Beach / swimming : ❌ Not recommended
- 💰 💰 Budget : ✅ Low season
Local context
What to expect in September
🎯 Cultural sites less crowded than peak season — more enjoyable visits Autumn marks the end of peak season in Bangkok. Temperatures drop (31°C) and rain returns (90% of days). With 90% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. December (8.2/10) is significantly better if possible.
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Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ☀️ January | 23°C | 32°C | 13% | 0.8 | 11.0h | 8.0/10 |
| ☀️ February | 24°C | 33°C | 22% | 1.2 | 11.0h | 7.5/10 |
| 🌤️ March | 26°C | 33°C | 25% | 1.4 | 11.0h | 7.5/10 |
| 🌤️ April | 27°C | 35°C | 39% | 2.8 | 11.7h | 7.0/10 |
| ⛅ May | 27°C | 33°C | 67% | 5.8 | 10.7h | 6.9/10 |
| ⛅ June | 26°C | 32°C | 79% | 5.1 | 10.0h | 6.6/10 |
| 🌧️ July | 26°C | 31°C | 84% | 6.7 | 8.2h | 6.0/10 |
| 🌧️ August | 25°C | 32°C | 84% | 6.2 | 8.3h | 5.5/10 |
| 🌧️ September | 25°C | 31°C | 90% | 9.9 | 8.6h | 5.7/10 |
| ⛅ October | 24°C | 31°C | 73% | 7.9 | 9.4h | 7.0/10 |
| 🌤️ November | 24°C | 31°C | 35% | 2.7 | 10.6h | 7.6/10 |
| ☀️ December | 23°C | 31°C | 13% | 0.6 | 10.8h | 8.2/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Bangkok averages 31°C, 90% rainy days and 8.6h of sunshine per day. Overall weather score: 5.7/10.
See methodology →
Comparison
September vs December (best month)
The best month is December (score 8.2/10). Difference:
- 🌡️ Max temperature : +0°C
- 🌧 Rainy days : -77%
- ☀️ Sunshine : +2.2h/day
FAQ
FAQ — Bangkok in September
Is September a good time to visit Bangkok?
September is an acceptable time for Bangkok (score 5.7/10). Conditions are decent but not optimal — consider December (8.2/10) if possible.
Does it rain a lot in Bangkok in September?
Yes, 90% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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