Chiang Mai · AutumnMonth summary
Chiang Mai weather in September
✅ Good
🌡️ Temperature min / max
73°F – 86°F
🌧 Rainy days
86% of days
☀️ Sunshine
9.6h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.0/10
📅 📅 Best month
December (9.0/10)
Quick decision
Should you visit Chiang Mai in September?
✅ Good
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: September is a good time to visit Chiang Mai. December remains slightly better (+2.0 pts).
By trip type
Chiang Mai in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : ✅ Low season
Local context
What to expect in September
Autumn in Chiang Mai is often underrated: 30°F, golden light and declining crowds. An interesting window. With 86% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. December (9.0/10) is significantly better if possible.
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Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ☀️ January | 63°F | 82°F | 13% | 0.0in | 10.3h | 8.9/10 |
| ☀️ February | 64°F | 86°F | 6% | 0.0in | 10.7h | 8.6/10 |
| ☀️ March | 70°F | 93°F | 6% | 0.0in | 11.0h | 7.5/10 |
| 🥵 April | 75°F | 97°F | 22% | 0.1in | 11.1h | 6.9/10 |
| ⛅ May | 75°F | 91°F | 60% | 0.3in | 11.3h | 7.0/10 |
| 🌧️ June | 75°F | 88°F | 87% | 0.3in | 9.7h | 6.4/10 |
| 🌧️ July | 75°F | 86°F | 90% | 0.5in | 8.4h | 6.0/10 |
| 🌧️ August | 75°F | 86°F | 96% | 0.5in | 8.2h | 5.4/10 |
| 🌧️ September | 73°F | 86°F | 86% | 0.4in | 9.6h | 7.0/10 |
| 🌤️ October | 72°F | 86°F | 59% | 0.2in | 10.4h | 7.2/10 |
| 🌤️ November | 70°F | 84°F | 30% | 0.1in | 10.2h | 8.1/10 |
| ☀️ December | 64°F | 82°F | 10% | 0.0in | 10.1h | 9.0/10 |
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, Chiang Mai averages 86°F, 86% rainy days and 9.6h of sunshine per day. Overall weather score: 7.0/10.
See methodology →
Comparison
September vs December (best month)
The best month is December (score 9.0/10). Difference:
- 🌡️ Max temperature : -2°F
- 🌧 Rainy days : -76%
- ☀️ Sunshine : +0.5h/day
FAQ
FAQ — Chiang Mai in September
Is September a good time to visit Chiang Mai?
September is an acceptable time for Chiang Mai (score 7.0/10). Conditions are decent but not optimal — consider December (9.0/10) if possible.
Does it rain a lot in Chiang Mai in September?
Yes, 86% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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