
| Month | Low | High |
|---|---|---|
| Jan | 34.2°F | 45.6°F |
| Feb | 35.9°F | 50.3°F |
| Mar | 38.6°F | 55.7°F |
| Apr | 41.9°F | 60.5°F |
| May | 47.5°F | 66.7°F |
| Jun | 52.6°F | 72.7°F |
| Jul | 56.9°F | 79.3°F |
| Aug | 57.3°F | 79.7°F |
| Sept | 52.5°F | 74.6°F |
| Oct | 45.2°F | 63.3°F |
| Nov | 39.8°F | 51.8°F |
| Dec | 35.0°F | 45.4°F |
Portland's coldest month is January when the average temperature overnight is 34.2°F. In August, the warmest month, the average day time temperature rises to 79.7°F.

| Month | Precipitation |
|---|---|
| Jan | 5.07in. |
| Feb | 4.18in. |
| Mar | 3.71in. |
| Apr | 2.64in. |
| May | 2.38in. |
| Jun | 1.59in. |
| Jul | 0.72in. |
| Aug | 0.93in. |
| Sept | 1.65in. |
| Oct | 2.88in. |
| Nov | 5.61in. |
| Dec | 5.71in. |
The driest month in Portland is July with 0.72 inches of precipitation, and with 5.71 inches December is the wettest month.