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Average humidity in San Francisco (CA)

On this page you find more information about the monthly relative humidity over the year in San Francisco (California), the United States of America.


San Francisco's humidity levels vary throughout the year. The highest levels occur in January, reaching 80% (very high), while the lowest is recorded in June at 71%.

Throughout the year, the average humidity in San Francisco is 75%.

Humidity plays an important role in how temperatures are felt. During the warmest month, September, the maximum average temperature is around 23°C. Combined with high humidity during this period, the temperature can feel even warmer than the thermometer shows.

During the coldest month, January, the maximum average temperature is around 14°C. This period has very high humidity. Check out our detailed temperature page for more information.


Forecast for San Francisco (CA)

Sun   Jan 12
18°C | 10°C
N 4 m/s
clear and no rain

clear and no rain

Mon   Jan 13
16°C | 8°C
SE 5 m/s
clear and no rain

clear and no rain

Tue   Jan 14
16°C | 8°C
E 2 m/s
clear and no rain

clear and no rain

Interested in more climate information?

This site provides you with all the information you need about the climate in San Francisco.

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