Portland, ME
Climate overview — based on NOAA 1991-2020 normals from PORTLAND INTL JETPORT, ME US.
Year-round temperatures (°F)
Climate summary
Portland has an annual average temperature of 47.5°F with about 48.1 inches of precipitation per year and 68.7 inches of snow. The warmest month is July (average high 79.5°F), and the coldest is January (average low 15.6°F). October is typically the wettest month (5.25 in) and July the driest (3.43 in). Snow typically falls from October through April.
Best time to visit Portland
Full guide →Climate change signal
All-time records →46 of 366 (12.6%) of Portland's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1940s | 70 | |
| 1950s | 41 | |
| 1960s | 25 | |
| 1970s | 35 | |
| 1980s | 38 | |
| 1990s | 50 | |
| 2000s | 36 | |
| 2010s | 43 | |
| 2020s | 28 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 32.4°F | 15.6°F | 24.0°F | 3.50 in | 18.6 in | 11 |
| February | 35.0°F | 17.3°F | 26.2°F | 3.54 in | 16.6 in | 10 |
| March | 42.3°F | 26.0°F | 34.1°F | 4.08 in | 13.6 in | 11 |
| April | 53.8°F | 35.4°F | 44.6°F | 4.41 in | 2.8 in | 11 |
| May | 64.2°F | 45.5°F | 54.9°F | 3.67 in | — | 13 |
| June | 73.6°F | 55.0°F | 64.3°F | 4.15 in | — | 12 |
| July | 79.5°F | 61.2°F | 70.4°F | 3.43 in | — | 11 |
| August | 78.7°F | 59.7°F | 69.2°F | 3.57 in | — | 9 |
| September | 71.1°F | 52.1°F | 61.6°F | 3.77 in | — | 9 |
| October | 59.5°F | 41.0°F | 50.3°F | 5.25 in | 0.2 in | 11 |
| November | 48.4°F | 31.7°F | 40.0°F | 4.25 in | 2.3 in | 11 |
| December | 38.3°F | 22.4°F | 30.3°F | 4.50 in | 14.6 in | 12 |
Climate twins of Portland
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).