Average annual temperature is 27.9 °C
Absolute maximum temperature: 35.3 °C
Absolute minimum temperature: 22.1 °C
Number of sunny days: 39 days
Number of rainy days: 326 days
Look at detailed online map of Ko Samui
* Weather data for Ko Samui Thailand is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 30.0 | 30.6 | 32.5 | 34.6 | 35.3 | 32.7 | 33.6 | 33.4 | 31.4 | 31.1 | 30.8 | 30.2 |
| Average daytime temperature (°C) | 28.4 | 29.2 | 30.3 | 32.8 | 32.5 | 31.1 | 30.4 | 31.7 | 29.7 | 29.8 | 29.1 | 29.0 |
| Average temperature (°C) | 26.3 | 26.9 | 27.5 | 29.8 | 29.7 | 28.7 | 28.1 | 28.7 | 27.5 | 27.6 | 26.9 | 27.1 |
| Average night temperature (°C) | 24.2 | 24.7 | 25.4 | 27.5 | 27.4 | 26.8 | 26.3 | 26.6 | 25.8 | 25.5 | 25.1 | 25.4 |
| Absolute minimum temperature (°C) | 22.1 | 23.2 | 24.0 | 25.9 | 25.5 | 24.9 | 24.0 | 25.8 | 25.0 | 24.1 | 23.7 | 23.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.6 | 11.8 | 12.1 | 12.3 | 12.6 | 12.7 | 12.6 | 12.4 | 12.2 | 11.9 | 11.7 | 11.6 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 9.6 | 10.5 | 10.8 | 11.1 | 10.9 | 9.4 | 8.2 | 10.7 | 8.4 | 9.6 | 7.8 | 9.9 |
| Precipitation (mm) | 68 | 64 | 30 | 33 | 90 | 127 | 172 | 111 | 252 | 206 | 310 | 79 |
| Sunny days | 4 | 4 | 16 | 4 | 3 | 3 | 3 | 1 | 0 | 0 | 1 | 0 |
| Rainy days | 27 | 24 | 15 | 26 | 28 | 27 | 28 | 30 | 30 | 31 | 29 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Ko Samui is at