Average annual temperature is 22.4 °C
Absolute maximum temperature: 39.8 °C
Absolute minimum temperature: 3.7 °C
Number of sunny days: 220 days
Number of rainy days: 145 days
Look at detailed online map of Siau
* Weather data for Siau India is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 21.9 | 28.1 | 29.8 | 36.7 | 39.8 | 39.1 | 34.9 | 33.9 | 34.6 | 33.9 | 29.2 | 23.5 |
| Average daytime temperature (°C) | 17.0 | 23.3 | 26.2 | 31.2 | 33.2 | 34.7 | 32.2 | 32.3 | 32.6 | 30.4 | 25.7 | 21.0 |
| Average temperature (°C) | 11.3 | 16.6 | 19.8 | 24.3 | 26.6 | 29.3 | 28.5 | 28.4 | 27.9 | 23.4 | 18.5 | 13.8 |
| Average night temperature (°C) | 7.1 | 10.7 | 14.2 | 17.7 | 20.3 | 24.4 | 25.3 | 24.9 | 23.8 | 17.6 | 12.9 | 8.3 |
| Absolute minimum temperature (°C) | 3.7 | 7.4 | 12.2 | 13.1 | 17.3 | 18.9 | 24.2 | 22.3 | 20.7 | 14.8 | 10.6 | 5.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.4 | 11.1 | 12.0 | 12.9 | 13.7 | 14.1 | 13.9 | 13.2 | 12.4 | 11.4 | 10.6 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 7.5 | 9.7 | 9.5 | 10.6 | 10.0 | 9.9 | 8.7 | 10.7 | 10.5 | 9.8 | 8.5 | 8.6 |
| Precipitation (mm) | 137 | 4 | 69 | 19 | 98 | 157 | 321 | 184 | 53 | 18 | 11 | 0 |
| Sunny days | 20 | 22 | 19 | 23 | 17 | 11 | 4 | 5 | 14 | 28 | 26 | 31 |
| Rainy days | 11 | 6 | 12 | 7 | 14 | 19 | 27 | 26 | 16 | 3 | 4 | 0 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siau is at