Average annual temperature is 23.3 °C
Absolute maximum temperature: 42.8 °C
Absolute minimum temperature: 1.9 °C
Number of sunny days: 219 days
Number of rainy days: 146 days
Look at detailed online map of Sīwan
* Weather data for Sīwan 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) | 21.6 | 28.6 | 32.2 | 39.5 | 42.8 | 40.9 | 36.7 | 36.0 | 36.4 | 34.4 | 29.2 | 23.2 |
| Average daytime temperature (°C) | 17.0 | 24.9 | 28.1 | 33.6 | 35.6 | 36.4 | 33.1 | 34.2 | 33.6 | 30.7 | 25.8 | 20.9 |
| Average temperature (°C) | 11.0 | 17.3 | 21.0 | 26.2 | 28.6 | 30.8 | 29.0 | 29.8 | 28.6 | 23.9 | 19.2 | 13.8 |
| Average night temperature (°C) | 6.4 | 11.0 | 15.1 | 19.2 | 22.0 | 25.5 | 25.6 | 26.0 | 24.4 | 18.0 | 13.7 | 8.4 |
| Absolute minimum temperature (°C) | 1.9 | 8.2 | 13.0 | 14.2 | 17.9 | 19.1 | 24.4 | 24.1 | 20.2 | 15.1 | 11.2 | 5.3 |
| 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) | 10.5 | 11.1 | 12.0 | 12.9 | 13.7 | 14.0 | 13.9 | 13.2 | 12.3 | 11.4 | 10.7 | 10.3 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 7.8 | 9.9 | 9.7 | 10.8 | 10.1 | 10.0 | 8.6 | 10.8 | 10.6 | 10.0 | 8.6 | 8.4 |
| Precipitation (mm) | 29 | 0 | 62 | 13 | 132 | 66 | 259 | 34 | 57 | 18 | 18 | 0 |
| Sunny days | 22 | 27 | 21 | 21 | 17 | 7 | 0 | 7 | 15 | 28 | 24 | 30 |
| Rainy days | 9 | 1 | 10 | 9 | 14 | 23 | 31 | 24 | 15 | 3 | 6 | 1 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Sīwan is at