Average annual temperature is 25.8 °C
Absolute maximum temperature: 36.3 °C
Absolute minimum temperature: 20.2 °C
Number of sunny days: 138 days
Number of rainy days: 227 days
Look at detailed online map of Siwalan
* Weather data for Siwalan Indonesia is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 29.7 | 28.2 | 30.0 | 29.7 | 30.0 | 31.7 | 31.3 | 32.8 | 35.4 | 36.3 | 36.0 | 35.8 |
| Average daytime temperature (°C) | 27.4 | 26.9 | 28.1 | 28.1 | 28.8 | 30.3 | 29.9 | 31.4 | 32.6 | 35.1 | 33.8 | 32.3 |
| Average temperature (°C) | 23.9 | 23.5 | 24.3 | 24.6 | 25.2 | 26.0 | 25.5 | 25.9 | 26.6 | 28.8 | 28.1 | 27.1 |
| Average night temperature (°C) | 21.4 | 21.4 | 21.7 | 22.2 | 22.4 | 22.9 | 22.5 | 22.1 | 22.7 | 24.4 | 24.3 | 23.6 |
| Absolute minimum temperature (°C) | 20.4 | 20.5 | 20.4 | 21.3 | 21.1 | 21.0 | 21.0 | 20.8 | 20.2 | 23.6 | 23.1 | 22.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Daylight mean duration (h) | 12.5 | 12.3 | 12.1 | 11.9 | 11.8 | 11.7 | 11.7 | 11.9 | 12.1 | 12.3 | 12.5 | 12.6 |
| Daylight minimum duration (h) | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 |
| Sunshine mean duration (h) | 7.6 | 5.3 | 8.5 | 8.9 | 10.3 | 10.8 | 10.6 | 10.9 | 11.0 | 11.3 | 10.8 | 9.7 |
| Precipitation (mm) | 793 | 942 | 566 | 662 | 70 | 51 | 20 | 0 | 1 | 13 | 65 | 98 |
| Sunny days | 2 | 0 | 0 | 0 | 16 | 14 | 23 | 30 | 26 | 12 | 6 | 9 |
| Rainy days | 29 | 28 | 31 | 30 | 15 | 16 | 8 | 1 | 4 | 19 | 24 | 22 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siwalan is at