Ko Samui Climate by Month
Ko Samui, Surat Thani, Thailand
Hot all year, with rain spread through the year.
Ko Samui is hot all year, with rain spread through the year. May is the warmest month, with highs around 92°F (33°C); December is the coolest at 85°F (29°C), and nights dip to 74°F (23°C). About 67 in (1712 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 92°F(33°C)
- Average high, May
- Coldest nights
- 74°F(23°C)
- Average low, January
- Rain per year
- 67 in(1712 mm)
- No clear rainy season
- Humidity
- 77%
- Sunniest: March
Best and worst months in Ko Samui
Best for weatherFebruary is the best time for weather in Ko Samui: highs near 87°F (30°C) and about 2.0 in (50 mm) of rain a month.
Least pleasantNovember is the least pleasant month: it's the wettest, with 15 in (372 mm) of rain.
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in February.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Ko Samui weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 85°F(30°C) | 74°F(23°C) | 4.5 in(115 mm) | 79% | 4.9 |
| FebFebruaryBest | 87°F(30°C) | 74°F(24°C) | 2.0 in(50 mm) | 76% | 5.8 |
| MarMarch | 89°F(32°C) | 76°F(24°C) | 4.1 in(105 mm) | 77% | 6.0 |
| AprApril | 91°F(33°C) | 77°F(25°C) | 3.6 in(92 mm) | 75% | 5.9 |
| MayMay | 92°F(33°C) | 77°F(25°C) | 4.8 in(121 mm) | 74% | 5.1 |
| JunJune | 90°F(32°C) | 77°F(25°C) | 3.2 in(82 mm) | 74% | 4.9 |
| JulJuly | 90°F(32°C) | 77°F(25°C) | 3.1 in(79 mm) | 74% | 4.8 |
| AugAugust | 89°F(32°C) | 77°F(25°C) | 3.5 in(89 mm) | 75% | 4.9 |
| SepSeptember | 89°F(32°C) | 76°F(24°C) | 4.5 in(114 mm) | 77% | 4.7 |
| OctOctober | 87°F(31°C) | 75°F(24°C) | 10 in(262 mm) | 80% | 4.6 |
| NovNovember | 85°F(30°C) | 75°F(24°C) | 15 in(372 mm) | 83% | 4.5 |
| DecDecember | 85°F(29°C) | 74°F(23°C) | 9.1 in(231 mm) | 79% | 4.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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