May marks the start of the wet season on Koh Lanta. Rain becomes more frequent, seas roughen, and many businesses begin closing. Early May still offers workable conditions, but by late May the island is transitioning into its off-season rhythm. Prices drop significantly and the island becomes very quiet.
29–34°C
Air temp
30°C
Sea temp
~150mm
Rainfall
Low
Crowds
why go
travel tips
Check that your chosen accommodation and restaurants are open before booking — closures begin in May.
Pack a quality rain jacket and waterproof bags for motorbike rides.
Sea conditions may not be suitable for boat trips from mid-May onwards — verify with operators.
May is an excellent month to experience Koh Lanta as a quiet local community rather than a tourist resort.
common questions
Depends on your priorities. Early May can still offer good conditions with significantly lower prices and crowds. Late May is genuinely wet — heavy rain, rough seas, and reduced activities and restaurant options. Budget travellers comfortable with unpredictable weather and a quiet island can find May very rewarding. Those wanting beach and diving conditions should stick to November–April.
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