Average annual temperature is 19.5 °C
Absolute maximum temperature: 42.4 °C
Absolute minimum temperature: 1.3 °C
Number of sunny days: 279 days
Number of rainy days: 86 days
Look at detailed online map of Williamstown
* Weather data for Williamstown Australia is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 40.6 | 42.4 | 41.4 | 33.8 | 26.5 | 20.8 | 23.0 | 32.2 | 37.3 | 37.1 | 40.5 | 41.5 |
| Average daytime temperature (°C) | 32.7 | 34.3 | 30.3 | 23.6 | 21.1 | 15.1 | 16.9 | 21.8 | 27.1 | 28.2 | 30.3 | 33.4 |
| Average temperature (°C) | 25.3 | 26.6 | 23.9 | 17.5 | 15.2 | 10.3 | 10.7 | 15.3 | 20.0 | 21.2 | 23.1 | 25.4 |
| Average night temperature (°C) | 17.6 | 18.5 | 17.1 | 11.9 | 9.4 | 5.6 | 5.2 | 8.8 | 12.8 | 13.7 | 15.3 | 17.0 |
| Absolute minimum temperature (°C) | 12.8 | 12.4 | 11.7 | 6.3 | 4.0 | 1.3 | 1.4 | 3.6 | 4.6 | 8.0 | 10.4 | 10.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 |
| Daylight mean duration (h) | 13.9 | 13.2 | 12.3 | 11.3 | 10.6 | 10.2 | 10.4 | 11.0 | 11.9 | 12.8 | 13.7 | 14.1 |
| Daylight minimum duration (h) | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 |
| Sunshine mean duration (h) | 11.8 | 11.5 | 9.9 | 9.6 | 9.2 | 7.6 | 8.8 | 9.0 | 10.5 | 11.6 | 11.6 | 12.3 |
| Precipitation (mm) | 20 | 26 | 19 | 15 | 1 | 37 | 5 | 29 | 3 | 3 | 16 | 3 |
| Sunny days | 24 | 24 | 23 | 22 | 28 | 14 | 25 | 25 | 21 | 28 | 21 | 24 |
| Rainy days | 7 | 4 | 8 | 8 | 3 | 16 | 6 | 6 | 9 | 3 | 9 | 7 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Williamstown is at