Koh Tao · AutumnMonth summary
Koh Tao weather in September
✅ Good
🌡️ Temperature min / max
26°C – 28°C
🌧 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: Koh Tao in September: 28°C and 9.7h of sunshine. Decent, but not the peak.
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
🎯 Water at 25°C and lively beaches — September is peak swimming season in Koh Tao Autumn in Koh Tao is often underrated: 28°C, 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 °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 25°C | 27°C | 28% | 3.2 | 11.0h | 8.3/10 |
| 🌤️ February | 26°C | 27°C | 30% | 1.9 | 11.0h | 8.3/10 |
| ☀️ March | 26°C | 28°C | 17% | 1.0 | 11.1h | 8.9/10 |
| 🌤️ April | 27°C | 29°C | 36% | 2.9 | 11.7h | 8.1/10 |
| ⛅ May | 27°C | 29°C | 69% | 5.0 | 11.4h | 7.3/10 |
| ⛅ June | 27°C | 29°C | 70% | 4.3 | 11.0h | 7.2/10 |
| ⛅ July | 26°C | 28°C | 71% | 4.7 | 10.1h | 7.3/10 |
| ⛅ August | 26°C | 28°C | 67% | 3.9 | 10.6h | 7.4/10 |
| ⛅ September | 26°C | 28°C | 75% | 6.0 | 9.7h | 7.2/10 |
| ⛅ October | 26°C | 28°C | 84% | 8.5 | 10.4h | 7.1/10 |
| ⛅ November | 26°C | 28°C | 73% | 9.1 | 10.5h | 7.2/10 |
| 🌤️ December | 26°C | 27°C | 44% | 5.2 | 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 28°C, 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°C
- 🌧 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
Find a place to stay in Koh Tao
Find places to stay in Koh Tao in September
Search on Hotels.com
Activities & tours
Activities and tours in Koh Tao
Guided tours, skip-the-line tickets and local experiences.
Browse activities on GetYourGuide
Flights
Find a flight to Koh Tao
Compare flights from all airlines.
Search flights
←
Explore also
Similar destinations in September
El Nido🌍 Top destinations
Other top destinations in September
Banjul
Puerto Escondido
TrinidadWeather rankings
Compare destinations by weather
Best in EuropeGuides & comparisons