Average annual temperature is 21.4 °C
Absolute maximum temperature: 34.0 °C
Absolute minimum temperature: 5.2 °C
Number of sunny days: 93 days
Number of rainy days: 272 days
Look at detailed online map of Siwei
* Weather data for Siwei 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) | 25.2 | 25.4 | 28.0 | 30.7 | 31.3 | 31.7 | 33.7 | 34.0 | 30.8 | 30.9 | 28.3 | 26.2 |
| Average daytime temperature (°C) | 18.9 | 20.6 | 22.4 | 24.7 | 26.5 | 29.3 | 30.6 | 30.6 | 29.5 | 26.4 | 24.1 | 21.1 |
| Average temperature (°C) | 15.5 | 16.6 | 17.8 | 20.7 | 22.8 | 25.4 | 26.2 | 26.4 | 25.0 | 22.8 | 19.7 | 17.6 |
| Average night temperature (°C) | 12.8 | 13.4 | 14.1 | 17.2 | 19.8 | 22.0 | 22.1 | 22.8 | 21.4 | 20.2 | 16.1 | 14.9 |
| Absolute minimum temperature (°C) | 5.2 | 8.3 | 7.7 | 11.5 | 14.4 | 19.2 | 20.1 | 20.3 | 18.0 | 17.1 | 10.1 | 8.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 13.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.9 | 11.4 | 12.0 | 12.7 | 13.3 | 13.5 | 13.4 | 12.9 | 12.3 | 11.6 | 11.0 | 10.7 |
| 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) | 6.9 | 7.3 | 8.9 | 8.6 | 7.9 | 8.9 | 10.0 | 9.5 | 9.3 | 7.5 | 8.9 | 6.8 |
| Precipitation (mm) | 45 | 53 | 25 | 75 | 235 | 409 | 467 | 190 | 603 | 314 | 15 | 45 |
| Sunny days | 13 | 10 | 16 | 6 | 4 | 3 | 4 | 3 | 3 | 2 | 19 | 10 |
| Rainy days | 18 | 18 | 15 | 24 | 27 | 27 | 27 | 28 | 27 | 29 | 11 | 21 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siwei is at