Koh Lanta · Month comparison
September vs March
March ranks #1 overall vs September at #12. Still excellent — dry season holds, crowds ease, prices begin to soften.
September
#12 of 12 months
Avoid
The wettest month of the year at 260mm — hard cap forces a weather score of 2.
- ↑Cheapest possible prices on accommodation — almost nothing left open to charge for
- ↑Waterfalls in the Mu Koh Lanta national park reach their peak flow
March
#1 of 12 months
Best match
Still excellent — dry season holds, crowds ease, prices begin to soften.
- ↑45mm rainfall remains very dry — weather still overwhelmingly reliable and sunny
- ↑High season crowds thinning as European winter holidays end, making beaches more enjoyable
| Factor | September | March |
|---|---|---|
| Weather score | 2 | 9 |
| Value score | 9 | 5 |
| Crowd score | 9 | 5 |
| Events score | 3 | 5 |
| Atmosphere | 4 | 8 |
| Avg high temp | 30°C | 33°C |
| Monthly rain | 260mm | 45mm |
| Daily sunshine | 4.5hrs | 9hrs |
September trade-offs
- ↓260mm exceeds 250mm: the absolute worst weather cap — this is a mandatory avoid for any weather-sensitive trip
- ↓Road flooding common — access to the southern national park unreliable
- ↓Essentially every business on the island is closed: this is genuine ghost-town mode
March trade-offs
- ↓Temperatures hitting 33°C by midday — less comfortable for active days than Feb
- ↓Some early monsoon showers possible in the last week as the Andaman begins to stir
- ↓Sea still calm but visibility at diving sites marginally less crystal than February
Scores compare months within Koh Lanta. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →