Average annual temperature is 12.0 °C
Absolute maximum temperature: 34.0 °C
Absolute minimum temperature: -9.9 °C
Number of sunny days: 189 days
Number of rainy days: 170 days
Number of snow days: 6 days
Look at detailed online map of Fort Lewis
* Weather data for Fort Lewis 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) | 17.2 | 22.5 | 23.3 | 27.2 | 26.8 | 29.5 | 34.0 | 33.5 | 33.3 | 26.8 | 22.5 | 16.5 |
| Average daytime temperature (°C) | 8.2 | 11.8 | 12.4 | 19.6 | 20.9 | 24.6 | 29.9 | 28.5 | 25.0 | 19.2 | 12.4 | 9.5 |
| Average temperature (°C) | 3.3 | 5.5 | 5.6 | 11.9 | 14.7 | 18.0 | 22.9 | 21.9 | 18.2 | 12.9 | 5.4 | 3.8 |
| Average night temperature (°C) | -0.4 | 0.4 | 0.2 | 5.0 | 9.1 | 11.7 | 16.5 | 16.4 | 12.4 | 7.6 | 0.3 | -0.3 |
| Absolute minimum temperature (°C) | -6.2 | -9.9 | -9.3 | -2.3 | -0.5 | 5.7 | 12.1 | 8.8 | 6.7 | -1.0 | -7.2 | -6.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.6 | 7.0 | 7.9 | 9.9 | 10.1 | 10.5 | 12.5 | 10.7 | 9.6 | 8.9 | 8.0 | 5.7 |
| Precipitation (mm) | 54 | 109 | 67 | 100 | 42 | 72 | 59 | 38 | 65 | 20 | 50 | 81 |
| Sunny days | 11 | 13 | 16 | 17 | 13 | 15 | 10 | 17 | 12 | 22 | 25 | 18 |
| Rainy days | 18 | 14 | 13 | 13 | 18 | 15 | 21 | 14 | 18 | 9 | 5 | 12 |
| Snow days | 2 | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Fort Lewis during the most sunny months:
The largest precipitation sum in Fort Lewis is at