Annual Average Humidity in California

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The average humidity year round is listed below for places in California. The tables give daily averages along with highest and lowest relative humidity levels.

Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold.

All the numbers here are averages for the years 1961 to 1990.

Average Humidity

In this table, the Daily number is the average of humidity readings taken every three hours throughout the day. Morning percentages are for 7 am and Afternoon measures are for 4 pm local standard time.

Average yearly relative humidity (%)
Daily Place Morning Afternoon
Southern California
53 Bakersfield 66 38
67 Long Beach 77 53
71 Los Angeles 75 64
69 San Diego 74 62
71 Santa Barbara 79 60
76 Santa Maria 85 61
Northern California
61 Fresno 75 40
67 Sacramento 80 46
74 San Francisco 82 61
63 Stockton 77 45

Highest and Lowest Humidity

Below are averages over the year for maximum and minimum humidity levels in California. The hours when the highest and lowest humidity readings usually occur are given in local standard time.

Annual averages for daily high and low relative humidity (%)
High Time Place Low Time
Southern California
66.2 4 am Bakersfield 38.0 4 pm
79.3 4 am Long Beach 50.9 1 pm
78.6 4 am Los Angeles 58.7 1 pm
76.1 4 am San Diego 57.8 1 pm
79.7 4 am Santa Barbara 57.7 1 pm
88.0 1 am Santa Maria 53.8 1 pm
Northern California
78.2 4 am Fresno 40.3 4 pm
82.4 4 am Sacramento 45.5 4 pm
83.8 4 am San Francisco 59.4 1 pm
77.9 4 am Stockton 44.6 4 pm
Reference

World Data Center for Meteorology. Climate of the World.

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