Annual Average Humidity in Washington

The average humidity year round is listed below for places in Washington. 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
80 Olympia 89 64
84 Quillayute 92 73
73 Seattle 82 62
65 Spokane 75 52
60 Yakima 71 44

Highest and Lowest Humidity

Below are averages over the year for maximum and minimum humidity levels in Washington. 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
91.4 4 am Olympia 63.8 4 pm
92.9 4 am Quillayute 72.3 1 pm
82.7 4 am Seattle 61.7 4 pm
77.5 4 am Spokane 51.6 4 pm
75.5 4 am Yakima 43.5 4 pm
Reference

World Data Center for Meteorology. Climate of the World.

Washington Humidity
Back to Top