Average annual temperature is 9.9 °C
Absolute maximum temperature: 21.5 °C
Absolute minimum temperature: -5.5 °C
Number of sunny days: 185 days
Number of rainy days: 178 days
Number of snow days: 2 days
Look at detailed online map of Lummi Island
* Weather data for Lummi Island 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) | 11.0 | 9.7 | 14.6 | 13.9 | 19.6 | 19.4 | 20.4 | 21.5 | 18.5 | 18.0 | 13.8 | 12.2 |
| Average daytime temperature (°C) | 7.6 | 6.4 | 8.2 | 9.5 | 14.0 | 15.3 | 17.6 | 18.4 | 15.8 | 12.7 | 9.4 | 9.1 |
| Average temperature (°C) | 6.1 | 4.7 | 6.0 | 7.6 | 11.8 | 13.1 | 15.0 | 15.7 | 13.5 | 10.6 | 7.2 | 7.4 |
| Average night temperature (°C) | 5.0 | 3.5 | 4.3 | 6.3 | 10.3 | 11.6 | 13.1 | 14.0 | 11.8 | 8.8 | 5.4 | 6.2 |
| Absolute minimum temperature (°C) | -0.8 | -5.5 | 1.1 | 2.8 | 8.1 | 10.3 | 11.9 | 12.0 | 8.3 | 0.2 | 0.2 | 1.3 |
| 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 | 16.0 | 15.0 | 13.0 | 11.0 | 9.0 | 8.0 |
| Daylight mean duration (h) | 8.8 | 10.2 | 11.9 | 13.7 | 15.3 | 16.1 | 15.7 | 14.3 | 12.6 | 10.8 | 9.2 | 8.3 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 13.0 | 11.0 | 9.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 3.3 | 4.1 | 7.7 | 7.0 | 12.2 | 12.3 | 13.6 | 12.0 | 9.1 | 5.9 | 4.7 | 2.5 |
| Precipitation (mm) | 77 | 68 | 67 | 106 | 20 | 22 | 9 | 31 | 42 | 138 | 141 | 162 |
| Sunny days | 8 | 7 | 10 | 7 | 27 | 22 | 28 | 25 | 17 | 16 | 12 | 6 |
| Rainy days | 22 | 20 | 21 | 23 | 4 | 8 | 3 | 6 | 13 | 15 | 18 | 25 |
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Lummi Island during the most sunny months:
Months with the longest average daylight duration in Lummi Island:
The largest precipitation sum in Lummi Island is at