May is the hottest month in Ko Samui with an average temperature of 30°C (85°F) and the coldest is January at 26°C (79°F) with the most daily sunshine hours at 8 in April. The wettest month is November with an average of 430mm of rain. The best month to swim in the sea is in April when the average sea temperature is 28°C (82°F).
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Sunrise 06:08
Sunset 18:09
Sunrise 06:08
Sunset 18:09