Cloudy skies · Maine
How cloudy is Portland, Maine?
In a typical year, the sky over Portland, Maine is mostly cloudy or overcast about 40% of the time, and clear or nearly clear about 52%.
May is the cloudiest month, mostly cloudy about 48% of the time, and August the least cloudy, at about 30%. Across winter, December to February, it’s mostly cloudy about 42% of the time. That makes it the 52nd least cloudy sky of the 116 US cities we track.
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The forecast for the next 48 hours has the sky mostly cloudy about 31% of the time.
Portland, Maine’s cloudiest month is May, at about 48% mostly cloudy, so spring here arrives with the sea fog still on.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
The sky at a glance
| Mostly cloudy or overcast, all year | 40% |
|---|---|
| Clear or nearly clear, all year | 52% |
| Mostly cloudy, December to February | 42% |
| Cloudiest month | May, 48% |
| Least cloudy month | August, 30% |
Shares of hours across a typical year. Mostly cloudy means at least five eighths of the sky covered; clear or nearly clear means two eighths or less.
Cities with about the same sky
- Green Bay, Wisconsin: mostly cloudy about 40% of the time
- San Diego, California: mostly cloudy about 40% of the time
- Concord, New Hampshire: mostly cloudy about 41% of the time
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00014764. Airport sensors see cloud up to about 12,000 feet, so thin high cloud isn’t counted.