Relative Humidity in San Diego, CA
The average annual humidity is 68%.
Local Climate Profile
San Diego enjoys a highly stable, comfortable climate due to the Pacific Ocean, though morning coastal fog (marine layer) drives early humidity up.
In San Diego, CA, the relative humidity fluctuates throughout the day. It is generally highest in the early morning, averaging 77% when the air is cool. As the sun heats the air throughout the day, the relative humidity naturally drops, reaching an average of 60% by the late afternoon.
Managing Indoor Comfort in San Diego, CA
Because outdoor weather directly impacts your indoor environment, residents of San Diego, CA must actively manage their home's humidity to stay within the ideal 30% to 60% range.
Since the local average is quite high, you should rely on your air conditioning and potentially a standalone dehumidifier to prevent mold growth and musty odors in your home.
Use the Calculator
If you have a hygrometer in your home, plug your current indoor temperature and humidity into the calculator above. It will instantly tell you the Dew Point and give you a comfort score!