Koh Tao, the smallest of the three Gulf islands, is the driest in summer and the diving benchmark, while Koh Samui offers more infrastructure and activities.
Comparison · September
Koh Tao or Koh Samui in September?
Koh Samui
Golfe de Thaïlande · Thaïlande
64/100 · Acceptable
Air29°C
Water29°C
Rain17 rainy days
Sun6h sun
The verdict
Close call in September
The two are close: Koh Tao (72) against Koh Samui (64). Choose on vibe and budget rather than the weather.
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Frequently asked questions
What's the best month to visit both Koh Tao and Koh Samui?
January offers the best simultaneous conditions for both: Koh Tao (100/100) and Koh Samui (100/100).
Can you combine Koh Tao and Koh Samui in the same trip?
Yes, easily: direct ferries link the two islands in just over an hour, a classic combo with Koh Phangan in between.