Ko Lanta weather in September
September in Ko Lanta: warm, soaked, with clean air — fine if you can take 24 rainy days.
#11 of 12 months in Ko Lanta · #709 of 897 destinations to visit in September · comfort 67/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ko Lanta in September
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Ko Lanta climate normals — September
| Daytime high | 28°C / 83°F | 🌤 warm |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 292 mm / 11.5 in | ⛈ soaked |
| Rainy days | 24 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 8.4 h/day | |
| Daylight | 12.2 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Ko Lanta in September — FAQ
- Is September a good time to visit Ko Lanta?
- September in Ko Lanta: warm, soaked, with clean air — fine if you can take 24 rainy days. It ranks #11 of 12 months for Ko Lanta on SeasonMap's comfort score (67/100).
- What is the weather like in Ko Lanta in September?
- In September, Ko Lanta averages a daily high of 28.2°C and a low of 25.1°C, with about 291.5 mm of rain over roughly 24.4 rainy days.
- What is the air quality in Ko Lanta in September?
- Ko Lanta has a mean US Air Quality Index of about 30 in September.