Humid cities · South Carolina
How humid is Charleston in summer?
Charleston right now
56°FClear skies
- Today56°F / 41°FClear skies
- Tomorrow57°F / 34°FClear skies
- Monday58°F / 39°FClouds
Look in the mirror. That's how dull today is.
Live from OpenWeatherMap. Alerts from the National Weather Service.
Across June, July and August, the dew point in Charleston averages about 71.7°F, which is tropical on the usual dew point scale.
July is the muggiest month, with the dew point averaging about 72.9°F. On NOAA’s hour by hour normals, about 2,999 hours, about 34% of the year, average a dew point of 65°F or more. That makes it the 10th 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.
Charleston’s summer dew point averages about 72°F. The charm is real, and so is the humidity it’s wrapped in.
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 | 71.7°F |
|---|---|
| Muggiest month | July, 72.9°F |
| Hours a year at a 65°F dew point or more | 2,999 (34%) |
| How summer feels | tropical |
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
- Mobile, Alabama: about 71.8°F
- Savannah, Georgia: about 71.5°F
- Tallahassee, Florida: about 71.5°F
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Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00013880. Average dew points, not the stickiest days.