Average annual temperature is 11.7 °C
Absolute maximum temperature: 39.0 °C
Absolute minimum temperature: -11.8 °C
Number of sunny days: 166 days
Number of rainy days: 198 days
Number of snow days: 1 day
Look at detailed online map of West Saint Helens
* Weather data for West Saint Helens United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 13.3 | 13.5 | 17.9 | 28.6 | 31.9 | 30.2 | 33.7 | 39.0 | 32.1 | 26.9 | 17.2 | 14.1 |
| Average daytime temperature (°C) | 8.5 | 7.4 | 10.6 | 13.6 | 22.6 | 24.0 | 28.6 | 30.1 | 23.3 | 17.9 | 11.5 | 9.9 |
| Average temperature (°C) | 5.2 | 3.3 | 5.3 | 8.4 | 15.4 | 16.4 | 20.1 | 21.7 | 16.6 | 12.7 | 7.4 | 6.7 |
| Average night temperature (°C) | 2.8 | 0.1 | 1.7 | 4.9 | 10.4 | 11.1 | 13.8 | 15.8 | 12.3 | 9.5 | 4.6 | 4.3 |
| Absolute minimum temperature (°C) | -4.8 | -11.8 | -3.9 | -0.6 | 6.8 | 7.5 | 11.3 | 11.6 | 8.3 | 2.1 | -2.6 | 0.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 |
| Daylight mean duration (h) | 9.1 | 10.4 | 11.9 | 13.5 | 14.9 | 15.7 | 15.3 | 14.1 | 12.5 | 10.9 | 9.5 | 8.7 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 2.9 | 4.5 | 5.4 | 6.1 | 11.0 | 12.1 | 12.9 | 11.4 | 8.7 | 6.5 | 5.1 | 2.9 |
| Precipitation (mm) | 141 | 115 | 157 | 233 | 39 | 45 | 4 | 29 | 93 | 132 | 166 | 271 |
| Sunny days | 7 | 8 | 3 | 5 | 21 | 22 | 27 | 20 | 16 | 16 | 13 | 8 |
| Rainy days | 24 | 19 | 28 | 25 | 10 | 8 | 4 | 11 | 14 | 15 | 17 | 23 |
| Snow days | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit West Saint Helens during the most sunny months:
Months with the longest average daylight duration in West Saint Helens:
The largest precipitation sum in West Saint Helens is at