Average annual temperature is 17.9 °C
Absolute maximum temperature: 30.1 °C
Absolute minimum temperature: 3.4 °C
Number of sunny days: 62 days
Number of rainy days: 303 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) | 21.9 | 21.2 | 25.1 | 27.8 | 28.7 | 27.9 | 30.1 | 29.5 | 26.4 | 26.3 | 23.0 | 22.1 |
| Average daytime temperature (°C) | 15.6 | 17.0 | 18.4 | 20.6 | 22.7 | 24.7 | 25.7 | 25.6 | 24.3 | 22.0 | 19.8 | 17.6 |
| Average temperature (°C) | 12.2 | 13.4 | 14.6 | 17.3 | 19.5 | 21.6 | 22.2 | 22.7 | 21.1 | 19.2 | 16.1 | 14.6 |
| Average night temperature (°C) | 9.2 | 10.0 | 10.8 | 14.0 | 16.6 | 18.5 | 18.8 | 19.7 | 18.2 | 16.6 | 12.8 | 11.9 |
| Absolute minimum temperature (°C) | 3.4 | 5.4 | 4.5 | 9.3 | 12.8 | 17.2 | 17.2 | 17.7 | 16.7 | 13.3 | 7.1 | 5.5 |
| 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 | 13.2 | 13.5 | 13.4 | 12.9 | 12.3 | 11.6 | 11.1 | 10.8 |
| Daylight minimum duration (h) | 10.0 | 11.0 | 11.0 | 12.0 | 12.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 7.6 | 8.6 | 9.9 | 10.1 | 8.9 | 9.3 | 10.1 | 9.0 | 9.3 | 7.9 | 9.5 | 7.9 |
| Precipitation (mm) | 213 | 270 | 232 | 300 | 377 | 505 | 724 | 477 | 508 | 526 | 82 | 248 |
| Sunny days | 8 | 8 | 8 | 4 | 3 | 1 | 7 | 0 | 4 | 0 | 13 | 6 |
| Rainy days | 23 | 20 | 23 | 26 | 28 | 29 | 24 | 31 | 26 | 31 | 17 | 25 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siwei is at