Average annual temperature is 12.2 °C
Absolute maximum temperature: 35.0 °C
Absolute minimum temperature: -15.8 °C
Number of sunny days: 173 days
Number of rainy days: 186 days
Number of snow days: 6 days
Look at detailed online map of Borough of Portland
* Weather data for Borough of Portland 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) | 17.9 | 17.8 | 16.4 | 30.9 | 30.2 | 35.0 | 33.8 | 30.3 | 33.8 | 28.2 | 19.8 | 15.9 |
| Average daytime temperature (°C) | 7.6 | 8.5 | 10.1 | 18.8 | 22.7 | 25.9 | 29.9 | 27.3 | 24.1 | 19.3 | 10.6 | 8.4 |
| Average temperature (°C) | 3.7 | 2.6 | 4.2 | 12.1 | 15.5 | 19.7 | 23.8 | 21.8 | 18.7 | 13.7 | 5.3 | 4.1 |
| Average night temperature (°C) | 0.4 | -2.0 | -0.4 | 6.7 | 8.6 | 14.3 | 18.6 | 17.1 | 14.5 | 9.4 | 1.0 | 1.0 |
| Absolute minimum temperature (°C) | -4.2 | -15.8 | -9.3 | -1.7 | 3.0 | 8.8 | 13.2 | 13.3 | 8.3 | 2.9 | -4.6 | -5.5 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 4.6 | 6.7 | 7.3 | 8.7 | 11.9 | 10.6 | 11.8 | 10.1 | 8.1 | 7.9 | 7.5 | 4.3 |
| Precipitation (mm) | 135 | 39 | 92 | 110 | 43 | 111 | 129 | 79 | 132 | 56 | 76 | 189 |
| Sunny days | 13 | 17 | 11 | 14 | 21 | 11 | 6 | 12 | 14 | 18 | 20 | 16 |
| Rainy days | 17 | 8 | 19 | 16 | 10 | 19 | 25 | 19 | 16 | 13 | 10 | 14 |
| Snow days | 1 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Borough of Portland during the most sunny months:
The largest precipitation sum in Borough of Portland is at