Summer temperatures · Maine
How hot does Portland, Maine get in summer?
Portland right now
44°FOvercast skies
- Today44°F / 37°FClouds
- Tomorrow47°F / 36°FClouds
- Monday46°F / 34°FClear skies
Get a job. It's dull out.
Live from OpenWeatherMap. Alerts from the National Weather Service.
In a typical summer, June to August, Portland, Maine averages highs around 77°F and lows around 59°F.
About 5 days a year reach 90°F or hotter, and 100°F doesn’t show up in a typical year. About 43 days a year get to 80°F or warmer. That makes it the 17th coolest summer of the 129 US cities we track.
Last updated
The hottest high in the forecast for the next 48 hours is about 47°F.
Portland, Maine averages about 5 days a year at 90°F or hotter, so the Atlantic is doing the air conditioning, free of charge.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 77°F |
|---|---|
| Average summer low | 59°F |
| Days a year at 80°F or warmer | 43 |
| Days a year at 90°F or hotter | 5 |
| Days a year at 100°F or hotter | none |
| Average winter high, for comparison | 35°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Spokane, Washington: highs around 81°F, lows around 55°F
- Portland, Oregon: highs around 80°F, lows around 57°F
- Casper, Wyoming: highs around 85°F, lows around 50°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014764.