City · Thailand
Best time to visit Koh Samui
The best time to visit Koh Samui is February and March, with daytime temperatures around 29°C.
Koh Samui at a glance: warmest in May with daytime temperatures around 30°C and coolest in January (27°C). The wettest month is November (414 mm) and the driest February (31 mm), with about 2,120 mm of rain a year. The sea is warmest in May (31°C). Sunniest in February.
Eddigo
Loading climate data…
Koh Samui
90 mWarm and muggy
77
29°/25°29°55 mm51 %12 h
A typical mid-March in Koh Samui
Sunny 15Cloudy 10Rain 5
Daytime temperature (night ☾)
25°28°30°18°34°
Sea temperature
29°18°34°
Daylight (solar time)
05:5818:02
0006121824
12 h 5 m
Precipitation
0420 mm
55 mm
Air feel
FreshComfortableHumidMuggy
RH 82 %
Month by month
| Month | Score | Day | Night | Sea | Rain | Wet days | Sun | Daylight | Feels like |
|---|---|---|---|---|---|---|---|---|---|
| January | 62 | 27° | 24° | 28° | 138 mm | 11 | 41 % | 12 h | Warm and muggy |
| February | 83 | 28° | 24° | 29° | 31 mm | 4 | 54 % | 12 h | Warm and muggy |
| March | 77 | 29° | 25° | 29° | 53 mm | 5 | 51 % | 12 h | Warm and muggy |
| April | 61 | 30° | 26° | 31° | 94 mm | 8 | 42 % | 12 h | Warm and muggy |
| May | 32 | 30° | 26° | 31° | 182 mm | 17 | 24 % | 13 h | Hot, showery and muggy |
| June | 33 | 30° | 26° | 30° | 154 mm | 16 | 14 % | 13 h | Hot, showery and muggy |
| July | 30 | 30° | 26° | 30° | 173 mm | 18 | 18 % | 13 h | Warm, rainy and muggy |
| August | 31 | 30° | 25° | 30° | 162 mm | 17 | 19 % | 12 h | Warm, rainy and muggy |
| September | 33 | 29° | 25° | 30° | 194 mm | 19 | 18 % | 12 h | Warm, rainy and muggy |
| October | 37 | 28° | 24° | 30° | 271 mm | 20 | 23 % | 12 h | Rainy season · warm, rainy and muggy |
| November | 38 | 28° | 24° | 29° | 414 mm | 20 | 26 % | 12 h | Rainy season · warm, rainy and muggy |
| December | 45 | 28° | 25° | 28° | 251 mm | 16 | 29 % | 12 h | Rainy season · warm, showery and muggy |
The score (0–100) combines daytime temperature, rain days, humidity and cloud cover, weighted for a typical warm-weather trip: 20–28 °C, little rain. On the map you can change these preferences.
Climate averages 2016–2025 (ERA5, CRU TS). Sea temperature from ERA5. Not a forecast. Elevation: 89 m. Coordinates: 9.51, 100.01.