Average Rainfall for Iowa in August





The tables below give monthly averages for rainfall during August at cities, towns and lakes in Iowa.

Each place has a total for the amount of precipitation it usually receives this month. Most sites also have information on the number of days with wet weather. That includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The rainfall totals are averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center.

You can jump to a separate table for each region of the state: Eastern, Central and Western Iowa.

Eastern Iowa

Average monthly precipitation in August
Days Place Inches Milli­metres
10 Burlington 4.3 108
10 Cedar Rapids 4.8 123
10 Clinton 4.5 114
10 Cresco 5.3 133
Davenport 4.6 117
10 Decorah 4.7 120
10 Dubuque 4.0 102
9 Iowa City 4.7 118
8 Keokuk 3.6 92
9 Waterloo 4.3 108

Central Iowa

August averages for total rainfall
Days Place Inches Milli­metres
9 Ames 4.8 122
9 Des Moines 4.1 105
9 Fort Dodge 4.5 115
8 Marshalltown 4.5 115
10 Mason City 4.0 103
10 Ottumwa 4.6 117
10 Rathbun Lake Dam 4.7 118

Western Iowa

Average amount of rain in August
Days Place Inches Milli­metres
9 Carroll 4.1 103
8 Lake Park 3.6 91
8 Milford 3.6 92
7 Onawa 3.5 88
9 Shenandoah 3.7 95
9 Sioux City 3.2 82
9 Storm Lake 4.5 113
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

Iowa Precipitation
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