Koh Tao · AutumnMonth summary
Koh Tao weather in September
✅ Good
🌡️ Temperature min / max
79°F – 82°F
🌧 Rainy days
75% of days
☀️ Sunshine
9.7h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.2/10
📅 📅 Best month
March (8.9/10)
Quick decision
Should you visit Koh Tao 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 Koh Tao. March remains slightly better (+1.7 pts).
By trip type
Koh Tao 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 Koh Tao is often underrated: 28°F, golden light and declining crowds. An interesting window. With 75% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. March (8.9/10) is significantly better if possible.
Browse by month
All months for Koh Tao
Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 77°F | 81°F | 28% | 0.1in | 11.0h | 8.3/10 |
| 🌤️ February | 79°F | 81°F | 30% | 0.1in | 11.0h | 8.3/10 |
| ☀️ March | 79°F | 82°F | 17% | 0.0in | 11.1h | 8.9/10 |
| 🌤️ April | 81°F | 84°F | 36% | 0.1in | 11.7h | 8.1/10 |
| ⛅ May | 81°F | 84°F | 69% | 0.2in | 11.4h | 7.3/10 |
| ⛅ June | 81°F | 84°F | 70% | 0.2in | 11.0h | 7.2/10 |
| ⛅ July | 79°F | 82°F | 71% | 0.2in | 10.1h | 7.3/10 |
| ⛅ August | 79°F | 82°F | 67% | 0.2in | 10.6h | 7.4/10 |
| ⛅ September | 79°F | 82°F | 75% | 0.2in | 9.7h | 7.2/10 |
| ⛅ October | 79°F | 82°F | 84% | 0.3in | 10.4h | 7.1/10 |
| ⛅ November | 79°F | 82°F | 73% | 0.4in | 10.5h | 7.2/10 |
| 🌤️ December | 79°F | 81°F | 44% | 0.2in | 11.0h | 7.8/10 |
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, Koh Tao averages 82°F, 75% rainy days and 9.7h of sunshine per day. Overall weather score: 7.2/10.
See methodology →
Comparison
September vs March (best month)
The best month is March (score 8.9/10). Difference:
- 🌡️ Max temperature : +0°F
- 🌧 Rainy days : -58%
- ☀️ Sunshine : +1.4h/day
FAQ
FAQ — Koh Tao in September
Is September a good time to visit Koh Tao?
September is an acceptable time for Koh Tao (score 7.2/10). Conditions are decent but not optimal — consider March (8.9/10) if possible.
Does it rain a lot in Koh Tao in September?
Yes, 75% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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Activities & tours
Activities and tours in Koh Tao
Guided tours, skip-the-line tickets and local experiences.
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