Humid cities · Oregon
How humid is Portland, Oregon in summer?
Portland right now
52°FOvercast skies
- Today57°F / 52°FRain
- Tomorrow53°F / 47°FRain
- Monday54°F / 43°FClouds
Weather rated two stars.
Live from OpenWeatherMap. Alerts from the National Weather Service.
Across June, July and August, the dew point in Portland, Oregon averages about 52.9°F, which is comfortable on the usual dew point scale.
August is the muggiest month, with the dew point averaging about 54.4°F. On NOAA’s hour by hour normals, no hour of the year averages a dew point of 65°F or more, though a muggy spell can still turn up. That makes it the 28th driest summer air of the 124 US cities we track.
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The highest dew point in the forecast for the next 48 hours is about 49°F, which is dry.
Portland’s summer dew point averages about 52.9°F, and August reaches about 54. It rains all winter and then forgets to be humid.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer humidity at a glance
| Dew point, June to August | 52.9°F |
|---|---|
| Muggiest month | August, 54.4°F |
| Hours a year at a 65°F dew point or more | none |
| How summer feels | comfortable |
The dew point is the temperature the air would have to cool to for dew to form, so the higher it is, the more water the air holds. Forecasters usually call under 55°F comfortable, 55 to 65°F sticky and 65°F or more muggy; 70°F or more feels tropical.
Cities with about the same summer air
- Rapid City, South Dakota: about 52.8°F
- San Francisco, California: about 52.6°F
- Sacramento, California: about 53.2°F
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Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00024229. Average dew points, not the stickiest days.