Humidity Levels in Washington During August

The average humidity in August 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 August
Daily Place Morning Afternoon
72 Olympia 88 50
82 Quillayute 93 66
68 Seattle 82 50
45 Spokane 59 28
48 Yakima 61 28

Highest and Lowest Humidity

Below are the averages during August 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 August
High Time Place Low Time
90.9 4 am Olympia 49.5 4 pm
94.9 4 am Quillayute 66.3 4 pm
83.2 4 am Seattle 50.4 4 pm
62.6 4 am Spokane 28.0 4 pm
69.9 4 am Yakima 27.8 4 pm

World Data Center for Meteorology. Climate of the World.

Washington Humidity
Back to Top