Ko Samui Weather in December
Thailand · 30-year monthly averages
🤔 Fair time to visit
December in Ko Samui is warm, with average daytime highs around 29°C (85°F) and nighttime lows near 24°C (75°F). Expect roughly 263mm of precipitation spread over about 12 rainy days, and heavy rainfall is common — this is peak wet season territory.
Avg high
29°C
85°F
Avg low
24°C
75°F
Rainfall
263mm
very wet
Rainy days
12
days with ≥1mm
🎒 What to pack
- light summer clothing
- sunscreen and sunglasses
- compact umbrella or rain jacket
December vs the rest of the year
FAQ
- How hot is Ko Samui in December?
- December in Ko Samui is warm, with average daytime highs around 29°C (85°F) and nighttime lows near 24°C (75°F). Expect roughly 263mm of precipitation spread over about 12 rainy days, and heavy rainfall is common — this is peak wet season territory.
- Does it rain a lot in Ko Samui in December?
- Ko Samui sees around 263mm of precipitation in December on average — very wet by global standards.
- Is December a good time to visit Ko Samui?
- December is a workable month to visit Ko Samui, but expect some weather trade-offs.