Average annual temperature is 21.5 °C
Absolute maximum temperature: 38.7 °C
Absolute minimum temperature: -1.0 °C
Number of sunny days: 154 days
Number of rainy days: 211 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) | 28.1 | 29.1 | 30.6 | 33.8 | 34.9 | 35.0 | 36.1 | 38.7 | 34.2 | 31.7 | 29.8 | 25.9 |
| Average daytime temperature (°C) | 21.0 | 25.0 | 26.0 | 29.4 | 29.8 | 31.7 | 33.3 | 34.7 | 32.2 | 27.7 | 22.8 | 19.3 |
| Average temperature (°C) | 14.4 | 18.0 | 19.2 | 22.4 | 23.4 | 25.8 | 27.7 | 28.6 | 25.7 | 21.6 | 17.0 | 14.2 |
| Average night temperature (°C) | 9.3 | 13.2 | 14.0 | 16.7 | 18.1 | 21.2 | 23.7 | 24.1 | 20.8 | 16.6 | 12.7 | 10.4 |
| Absolute minimum temperature (°C) | -1.0 | 4.2 | 3.5 | 8.8 | 11.8 | 17.6 | 21.8 | 21.7 | 16.1 | 7.8 | 2.2 | 1.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.1 | 12.0 | 12.9 | 13.6 | 14.0 | 13.8 | 13.2 | 12.3 | 11.4 | 10.7 | 10.3 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 8.3 | 8.8 | 9.4 | 10.0 | 11.2 | 10.9 | 11.2 | 11.3 | 10.4 | 9.2 | 6.9 | 6.8 |
| Precipitation (mm) | 63 | 45 | 87 | 69 | 73 | 173 | 127 | 94 | 114 | 46 | 87 | 116 |
| Sunny days | 17 | 20 | 17 | 10 | 11 | 3 | 5 | 5 | 9 | 23 | 17 | 17 |
| Rainy days | 14 | 8 | 14 | 20 | 20 | 27 | 26 | 26 | 21 | 8 | 13 | 14 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Forest Grove is at