Humidity Levels in Washington During May

The average humidity in May 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 relative humidity (%) in May
Daily Place Morning Afternoon
73 Olympia 84 55
80 Quillayute 90 66
69 Seattle 80 54
58 Spokane 69 41
48 Yakima 56 31

Highest and Lowest Humidity

Below are the averages during May for maximum and minimum humidity levels in Washington. The hours when this month's highest and lowest humidity readings usually occur are given in local standard time.

Daily high and low relative humidity (%) averages in May
High Time Place Low Time
89.6 4 am Olympia 54.5 4 pm
93.3 4 am Quillayute 66.0 1 pm
82.2 4 am Seattle 53.8 4 pm
76.5 4 am Spokane 40.7 4 pm
69.6 4 am Yakima 30.6 4 pm

World Data Center for Meteorology. Climate of the World.

Washington Humidity
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