Average annual temperature is 26.0 °C
Absolute maximum temperature: 34.0 °C
Absolute minimum temperature: 17.3 °C
Number of sunny days: 63 days
Number of rainy days: 302 days
Look at detailed online map of Province of Ilocos Sur
* Weather data for Province of Ilocos Sur Philippines is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 31.5 | 33.8 | 32.3 | 34.0 | 33.9 | 30.5 | 31.4 | 30.3 | 30.7 | 30.8 | 31.5 | 32.1 |
| Average daytime temperature (°C) | 29.3 | 30.7 | 30.4 | 31.9 | 31.6 | 29.4 | 29.5 | 28.9 | 29.2 | 29.5 | 30.0 | 29.9 |
| Average temperature (°C) | 24.8 | 25.4 | 25.9 | 27.2 | 27.4 | 26.1 | 26.2 | 25.8 | 25.9 | 25.8 | 25.5 | 25.4 |
| Average night temperature (°C) | 20.9 | 20.7 | 21.3 | 22.9 | 23.8 | 23.3 | 23.5 | 23.4 | 23.2 | 22.4 | 21.4 | 21.5 |
| Absolute minimum temperature (°C) | 18.2 | 17.3 | 18.9 | 20.3 | 21.9 | 21.2 | 22.2 | 21.4 | 22.2 | 20.7 | 19.1 | 19.6 |
| 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 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.2 | 11.6 | 12.0 | 12.5 | 12.9 | 13.1 | 13.0 | 12.7 | 12.2 | 11.8 | 11.3 | 11.1 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 13.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 9.1 | 10.4 | 11.2 | 11.7 | 11.0 | 8.8 | 7.8 | 8.7 | 7.9 | 8.8 | 10.0 | 9.9 |
| Precipitation (mm) | 42 | 23 | 28 | 102 | 311 | 510 | 860 | 487 | 389 | 188 | 59 | 77 |
| Sunny days | 10 | 17 | 14 | 5 | 0 | 0 | 1 | 0 | 0 | 1 | 8 | 7 |
| Rainy days | 21 | 11 | 17 | 25 | 31 | 30 | 30 | 31 | 30 | 30 | 22 | 24 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Province of Ilocos Sur is at