Koh Lanta · AutumnMonth summary
Koh Lanta weather in September
✅ Good
🌡️ Temperature min / max
26°C – 29°C
🌧 Rainy days
84% of days
☀️ Sunshine
10.2h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.0/10
📅 📅 Best month
February (7.8/10)
Quick decision
Should you visit Koh Lanta 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 Lanta in September: 29°C and 10.2h of sunshine. Decent, but not the peak.
By trip type
Koh Lanta 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
🎯 Good family period — decent temperatures and sites accessible without crowds Autumn in Koh Lanta is often underrated: 29°C, golden light and declining crowds. An interesting window. With 84% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. February (7.8/10) is significantly better if possible.
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All months for Koh Lanta
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 25°C | 31°C | 36% | 2.4 | 11.0h | 7.7/10 |
| ☀️ February | 25°C | 32°C | 23% | 1.0 | 11.1h | 7.8/10 |
| 🌤️ March | 26°C | 32°C | 33% | 1.8 | 11.2h | 7.6/10 |
| ⛅ April | 26°C | 31°C | 69% | 4.3 | 11.2h | 7.1/10 |
| 🌦️ May | 26°C | 30°C | 87% | 8.3 | 10.1h | 7.0/10 |
| ⛅ June | 26°C | 30°C | 76% | 7.9 | 10.5h | 7.1/10 |
| ⛅ July | 26°C | 30°C | 73% | 6.6 | 10.4h | 7.1/10 |
| ⛅ August | 26°C | 29°C | 82% | 8.1 | 10.6h | 7.1/10 |
| ⛅ September | 26°C | 29°C | 84% | 10.8 | 10.2h | 7.0/10 |
| 🌧️ October | 25°C | 29°C | 87% | 10.7 | 9.4h | 7.0/10 |
| 🌧️ November | 25°C | 29°C | 86% | 8.1 | 9.1h | 7.0/10 |
| 🌤️ December | 25°C | 30°C | 51% | 4.1 | 11.0h | 7.4/10 |
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 Lanta averages 29°C, 84% rainy days and 10.2h of sunshine per day. Overall weather score: 7.0/10.
See methodology →
Comparison
September vs February (best month)
The best month is February (score 7.8/10). Difference:
- 🌡️ Max temperature : +3°C
- 🌧 Rainy days : -61%
- ☀️ Sunshine : +0.9h/day
FAQ
FAQ — Koh Lanta in September
Is September a good time to visit Koh Lanta?
September is an acceptable time for Koh Lanta (score 7.0/10). Conditions are decent but not optimal — consider February (7.8/10) if possible.
Does it rain a lot in Koh Lanta in September?
Yes, 84% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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Activities & tours
Activities and tours in Koh Lanta
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