Average annual temperature is 22.0 °C
Absolute maximum temperature: 34.1 °C
Absolute minimum temperature: 4.0 °C
Number of sunny days: 118 days
Number of rainy days: 247 days
Look at detailed online map of Siwan
* Weather data for Siwan Taiwan is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 24.5 | 28.3 | 32.8 | 30.2 | 32.7 | 31.8 | 34.1 | 33.0 | 33.6 | 34.0 | 29.1 | 27.4 |
| Average daytime temperature (°C) | 18.4 | 19.8 | 22.8 | 24.4 | 27.4 | 29.3 | 31.5 | 30.8 | 30.5 | 27.7 | 24.9 | 20.6 |
| Average temperature (°C) | 14.9 | 15.8 | 18.0 | 20.9 | 23.9 | 26.2 | 27.7 | 27.4 | 26.6 | 23.9 | 20.5 | 17.2 |
| Average night temperature (°C) | 11.7 | 12.7 | 14.3 | 17.8 | 20.8 | 23.5 | 24.7 | 24.5 | 23.6 | 20.9 | 17.0 | 14.5 |
| Absolute minimum temperature (°C) | 4.0 | 7.1 | 9.2 | 13.1 | 16.1 | 21.9 | 22.8 | 22.3 | 21.1 | 17.9 | 9.8 | 5.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.8 | 11.3 | 12.0 | 12.7 | 13.3 | 13.6 | 13.5 | 13.0 | 12.3 | 11.6 | 11.0 | 10.6 |
| Daylight minimum duration (h) | 10.0 | 11.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 7.4 | 7.6 | 9.1 | 9.2 | 9.7 | 9.3 | 10.2 | 10.1 | 9.6 | 8.9 | 9.5 | 7.1 |
| Precipitation (mm) | 55 | 58 | 85 | 225 | 216 | 461 | 238 | 217 | 247 | 178 | 36 | 105 |
| Sunny days | 13 | 15 | 15 | 6 | 9 | 4 | 6 | 5 | 4 | 9 | 20 | 12 |
| Rainy days | 18 | 13 | 16 | 24 | 22 | 26 | 25 | 26 | 26 | 22 | 10 | 19 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siwan is at