Humidity Levels in Oregon During August

The average humidity in August is listed below for places in Oregon. 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
82 Astoria 90 70
65 Eugene 84 40
50 Medford 69 27
38 Pendleton 50 26
65 Portland 81 44
64 Salem 80 40

Highest and Lowest Humidity

Below are the averages during August for maximum and minimum humidity levels in Oregon. 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
90.6 4 am Astoria 69.1 1 pm
87.2 4 am Eugene 39.8 4 pm
74.5 4 am Medford 26.8 4 pm
52.9 4 am Pendleton 25.6 4 pm
82.0 4 am Portland 44.0 4 pm
86.2 4 am Salem 40.1 4 pm

World Data Center for Meteorology. Climate of the World.

Oregon Humidity
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