The tour staff were incredibly kind and kept a close eye on our belongings to ensure they weren't lost! They took photos and videos just like in the advertisements, and I was extremely satisfied with the snorkeling spots, the hiking trails on Koh Nangyuan, and the color of the water at the beach. The lunch buffet was delicious too! Good good!!
Koh Samui Island Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Koh Samui Island year round climate
Spring (March–May): Average 83–85°F, hot and dry climate with low rainfall. Common activities: Swimming, sunbathing, watersports. Recommended clothing: Light short sleeves, shorts, swimwear, sandals.
Summer (June–August): Average 84–85°F, 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 81–83°F, 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 80–82°F, 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. 83.3°F / Annual rainfall: approx. 2370 mm / Summer humidity: 70%–80% / Rainiest month: December
Koh Samui Island monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
81.3°F
186.9
February
82°F
120.5
March
83.3°F
59.4
April
85.3°F
31.3
May
85.6°F
136.7
June
85.5°F
110
July
84°F
218
August
84.7°F
113.9
September
83.5°F
162.2
October
82.2°F
326.4
November
81.1°F
445.1
December
81°F
460.5
Koh Samui Island weather for the next seven days
5/5
Tuesday
Moderate rain
85.5°F/84°F
5/6
Wednesday
Patchy rain nearby
85.9°F/83.2°F
5/7
Thursday
Moderate rain
85.5°F/84.2°F
5/8
Friday
Moderate rain
86.3°F/83.5°F
5/9
Saturday
Patchy rain nearby
85.6°F/83°F
5/10
Sunday
Partly Cloudy
85.3°F/84.3°F
5/11
Monday
Sunny
85.5°F/84.3°F
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