Average humidity in San Diego (CA)

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

San Diego's humidity levels vary throughout the year. The highest levels occur in July, reaching 75% (high), while the lowest is recorded in January at 64%.

Throughout the year, the average humidity in San Diego is 69%.

Humidity plays an important role in how temperatures are felt. During the warmest month, September, the maximum average temperature is around 26°C (79°F). Combined with high humidity during this period, the temperature can feel even warmer than the thermometer shows.

During the coldest month, December, the maximum average temperature is around 19°C (66°F). This period has high humidity. Check out our detailed temperature page for more information.