Humidity Levels in Iowa During July

The average humidity in July is listed below for places in Iowa. 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 6 am and Afternoon measures are for 3 pm local standard time.

Average relative humidity (%) in July
Daily Place Morning Afternoon
68 Des Moines 82 53
Dubuque 85 56
69 Sioux City 85 53
72 Waterloo 87 55

Highest and Lowest Humidity

Below are the averages during July for maximum and minimum humidity levels in Iowa. 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 July
High Time Place Low Time
82.0 6 am Des Moines 52.8 3 pm
84.9 6 am Dubuque 56.3 3 pm
85.0 6 am Sioux City 53.0 3 pm
86.7 3 am Waterloo 54.9 3 pm

World Data Center for Meteorology. Climate of the World.

Iowa Humidity
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