Cloudy skies · Oregon
How cloudy is Portland, Oregon?
In a typical year, the sky over Portland, Oregon is mostly cloudy or overcast about 57% of the time, and clear or nearly clear about 32%.
January is the cloudiest month, mostly cloudy about 76% of the time, and August the least cloudy, at about 33%. That makes it the 9th cloudiest 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 56% of the time.
Portland, Oregon is mostly cloudy about 76% of the time in January, then clears off to about 33% in August, which is when everybody suddenly remembers the mountains.
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 | 57% |
|---|---|
| Clear or nearly clear, all year | 32% |
| Mostly cloudy, December to February | too few readings |
| Cloudiest month | January, 76% |
| Least cloudy month | August, 33% |
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
- Grand Rapids, Michigan: mostly cloudy about 58% of the time
- Indianapolis, Indiana: mostly cloudy about 55% of the time
- Washington, DC: mostly cloudy about 55% of the time
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00024229. Airport sensors see cloud up to about 12,000 feet, so thin high cloud isn’t counted.