Average Rainfall for Iowa in September

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The tables below give monthly averages for rainfall during September 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 September
Days Place Inches Millimetres
  8 Burlington 3.5   89
  9 Cedar Rapids 3.7   93
  9 Clinton 3.0   76
10 Cresco 3.8   98
  – Davenport 3.1   78
10 Decorah 3.3   85
  9 Dubuque 3.5   89
  8 Iowa City 3.2   81
  7 Keokuk 3.6   92
  9 Waterloo 2.6   67

Central Iowa

September averages for total rainfall
Days Place Inches Millimetres
  8 Ames 3.3   83
  8 Des Moines 3.1   77
  8 Fort Dodge 3.0   77
  8 Marshalltown 3.7   94
  9 Mason City 3.3   83
  8 Ottumwa 3.8   96
  9 Rathbun Lake Dam 4.0 102

Western Iowa

Average amount of rain in September
Days Place Inches Millimetres
  8 Carroll 3.0   77
  8 Lake Park 3.0   77
  8 Milford 3.1   79
  7 Onawa 3.1   79
  7 Shenandoah 3.2   82
  8 Sioux City 3.0   75
  8 Storm Lake 3.2   82
Reference

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

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