Humid cities · District of Columbia
How humid is Washington, DC in summer?
Across June, July and August, the dew point in Washington, DC averages about 64.8°F, which is sticky on the usual dew point scale.
July is the muggiest month, with the dew point averaging about 66.4°F. On NOAA’s hour by hour normals, about 1,282 hours, about 15% of the year, average a dew point of 65°F or more. That makes it the 37th most humid summer 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 39°F, which is dry.
Washington’s summer dew point averages about 64.8°F, and July tips it to about 66. The monuments are marble, the air is mostly steam.
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 | 64.8°F |
|---|---|
| Muggiest month | July, 66.4°F |
| Hours a year at a 65°F dew point or more | 1,282 (15%) |
| How summer feels | sticky |
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
- Wichita, Kansas: about 64.7°F
- Springfield, Illinois: about 64.5°F
- St. Louis, Missouri: about 65.1°F
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00013743. Average dew points, not the stickiest days.