Thailand destinations
Best Time to Visit Koh Samui: Weather & Seasons
When to visit Koh Samui — its Gulf climate differs from the Andaman coast, so timing matters.
Samui’s Gulf-of-Thailand seasons differ from Phuket’s.
Driest, sunniest (Dec–Apr) — best
The most reliable beach weather, especially February to April.
Shoulder (May–Sep)
Generally good, with some passing showers.
Wettest (Oct–Dec)
Samui’s rainiest stretch, especially November — different from the Andaman coast, so check before booking.
See also: the full Koh Samui travel guide.
Frequently asked questions
When is the best time to visit Koh Samui? +
Roughly December to April for the driest, sunniest weather; February to April is especially reliable.
Does Koh Samui have a different rainy season to Phuket? +
Yes — Samui's wettest months are around October to December, unlike the Andaman coast's May–October monsoon.
Part of our Koh Samui guide.
