Humid cities · California
How humid is San Francisco in summer?
San Francisco right now
55°FBroken cloud
- Today58°F / 55°FClouds
- Tomorrow59°F / 55°FClouds
- Monday61°F / 54°FClear skies
Live from OpenWeatherMap. Alerts from the National Weather Service.
Across June, July and August, the dew point in San Francisco averages about 52.6°F, which is comfortable on the usual dew point scale.
August is the muggiest month, with the dew point averaging about 54.2°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 26th driest summer air of the 124 US cities we track.
Last updated
A weather alert is in force here, so no joke today. The National Weather Service has the details.
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 | 52.6°F |
|---|---|
| Muggiest month | August, 54.2°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
- Portland, Oregon: about 52.9°F
- Sacramento, California: about 53.2°F
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00023234. Average dew points, not the stickiest days.