Average annual temperature is 5.8 °C
Absolute maximum temperature: 31.9 °C
Absolute minimum temperature: -31.0 °C
Number of sunny days: 169 days
Number of rainy days: 144 days
Number of snow days: 52 days
Look at detailed online map of Forest Grove
* Weather data for Forest Grove 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) | 2.4 | 6.2 | 4.2 | 17.8 | 28.7 | 31.0 | 30.6 | 29.9 | 31.9 | 28.1 | 13.5 | 7.7 |
| Average daytime temperature (°C) | -5.9 | -3.8 | -1.0 | 7.2 | 21.4 | 25.7 | 24.1 | 24.3 | 21.8 | 12.0 | 3.2 | 1.3 |
| Average temperature (°C) | -9.5 | -10.0 | -6.3 | 1.3 | 14.4 | 19.6 | 18.6 | 18.9 | 16.5 | 7.8 | -1.2 | -1.9 |
| Average night temperature (°C) | -12.8 | -15.1 | -11.0 | -3.3 | 8.1 | 14.6 | 13.9 | 14.8 | 12.6 | 4.7 | -4.1 | -4.2 |
| Absolute minimum temperature (°C) | -28.6 | -31.0 | -18.6 | -12.4 | -1.2 | 7.7 | 9.4 | 10.5 | 5.6 | -6.9 | -14.6 | -12.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 10.0 | 12.0 | 14.0 | 15.0 | 16.0 | 15.0 | 15.0 | 13.0 | 11.0 | 9.0 | 8.0 |
| Daylight mean duration (h) | 8.9 | 10.2 | 11.9 | 13.7 | 15.2 | 16.0 | 15.6 | 14.3 | 12.6 | 10.8 | 9.3 | 8.5 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 3.6 | 7.2 | 7.7 | 7.2 | 11.7 | 12.4 | 12.3 | 10.5 | 8.2 | 5.7 | 4.4 | 3.2 |
| Precipitation (mm) | 11 | 26 | 38 | 64 | 61 | 113 | 81 | 67 | 93 | 80 | 20 | 50 |
| Sunny days | 21 | 16 | 19 | 13 | 16 | 10 | 6 | 13 | 11 | 14 | 15 | 15 |
| Rainy days | 2 | 5 | 2 | 8 | 15 | 20 | 25 | 18 | 19 | 13 | 8 | 9 |
| Snow days | 8 | 7 | 10 | 9 | 0 | 0 | 0 | 0 | 0 | 4 | 7 | 7 |
The best time to visit Forest Grove during the most sunny months:
Months with the longest average daylight duration in Forest Grove:
The largest precipitation sum in Forest Grove is at