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Koh Samui Island
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Koh Samui Island Weather and climate
Data source：Meteostat
Update date：2025-09
Koh Samui Island year round climate
- Spring (March–May): Average 28.5–29.8°C, hot and dry climate with low rainfall. Common activities: Swimming, sunbathing, watersports. Recommended clothing: Light short sleeves, shorts, swimwear, sandals.
- Summer (June–August): Average 28.9–29.7°C, hot and humid climate with occasional showers. Common activities: Swimming, diving, snorkeling, island exploration. Recommended clothing: Light and breathable clothing, short sleeves, shorts, sandals, and rain gear.
- Autumn (September–November): Average 27.3–28.6°C, warm and humid climate with gradually increasing rainfall. Common activities: Visiting temples, enjoying Thai massage, tasting local cuisine. Recommended clothing: Light long sleeves or short sleeves, long pants or shorts, comfortable shoes.
- Winter (December–February): Average 27.2–27.8°C, warm and humid climate with higher rainfall. Common activities: Swimming, sunbathing, watersports, but be mindful of sea conditions. Recommended clothing: Light long sleeves or short sleeves, long pants or shorts, comfortable shoes, and rain gear.
Koh Samui Island climatological average
Annual average temperature: approx. 28.5°C / Annual rainfall: approx. 2370 mm / Summer humidity: 70%–80% / Rainiest month: December
Koh Samui Island monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
27.4°C
186.9
February
27.8°C
120.5
March
28.5°C
59.4
April
29.6°C
31.3
May
29.8°C
136.7
June
29.7°C
110
July
28.9°C
218
August
29.3°C
113.9
September
28.6°C
162.2
October
27.9°C
326.4
November
27.3°C
445.1
December
27.2°C
460.5
Koh Samui Island weather for the next seven days
10/13
Monday
Moderate rain
28.7°C/27°C
10/14
Tuesday
Moderate rain
27.6°C/26.9°C
10/15
Wednesday
Patchy rain nearby
28.6°C/27.9°C
10/16
Thursday
Patchy rain nearby
28.9°C/28°C
10/17
Friday
Moderate rain
28.7°C/27.3°C
10/18
Saturday
Patchy rain nearby
28.8°C/27.9°C
10/19
Sunday
Patchy rain nearby
28.9°C/27.9°C
