Iowa weather by county

Iowa in September 2026

• 99 of 99 counties ran at least 1° warmer than usual in September 2026, and 0 ran at least 1° cooler.
• Warmest against its own records: Monona County (1st-warmest September of 132). Even the least warm, Allamakee County, had its 23rd-warmest.
• Wettest September against its records: Adams County, 11.2 inches (1st-wettest).
• No county was in moderate drought or worse on NOAA's Palmer reading for September.
• Since 1970 the state's counties have warmed about 0.4° per decade on average, Winneshiek County the most at 0.6°.

This week's forecast against the usual, and every month since 1895, for all 99 counties in Iowa. 78 had a top-10 warm September in 2026.

• Adair County 5th warmest Sep
• Adams County 5th warmest Sep
• Allamakee County 23rd warmest Sep
• Appanoose County 3rd warmest Sep
• Audubon County 6th warmest Sep
• Benton County 11th warmest Sep
• Black Hawk County 9th warmest Sep
• Boone County 9th warmest Sep
• Bremer County 11th warmest Sep
• Buchanan County 5th warmest Sep
• Buena Vista County 14th warmest Sep
• Butler County 12th warmest Sep
• Calhoun County 11th warmest Sep
• Carroll County 6th warmest Sep
• Cass County 5th warmest Sep
• Cedar County 4th warmest Sep
• Cerro Gordo County 10th warmest Sep
• Cherokee County 8th warmest Sep
• Chickasaw County 10th warmest Sep
• Clarke County 5th warmest Sep
• Clay County 14th warmest Sep
• Clayton County 9th warmest Sep
• Clinton County 3rd warmest Sep
• Crawford County 4th warmest Sep
• Dallas County 8th warmest Sep
• Davis County 3rd warmest Sep
• Decatur County 3rd warmest Sep
• Delaware County 4th warmest Sep
• Des Moines County 3rd warmest Sep
• Dickinson County 15th warmest Sep
• Dubuque County 7th warmest Sep
• Emmet County 7th warmest Sep
• Fayette County 15th warmest Sep
• Floyd County 8th warmest Sep
• Franklin County 17th warmest Sep
• Fremont County 3rd warmest Sep
• Greene County 7th warmest Sep
• Grundy County 10th warmest Sep
• Guthrie County 5th warmest Sep
• Hamilton County 10th warmest Sep
• Hancock County 14th warmest Sep
• Hardin County 8th warmest Sep
• Harrison County 4th warmest Sep
• Henry County 3rd warmest Sep
• Howard County 8th warmest Sep
• Humboldt County 22nd warmest Sep
• Ida County 5th warmest Sep
• Iowa County 7th warmest Sep
• Jackson County 5th warmest Sep
• Jasper County 4th warmest Sep
• Jefferson County 5th warmest Sep
• Johnson County 4th warmest Sep
• Jones County 8th warmest Sep
• Keokuk County 3rd warmest Sep
• Kossuth County 13th warmest Sep
• Lee County 4th warmest Sep
• Linn County 7th warmest Sep
• Louisa County 2nd warmest Sep
• Lucas County 3rd warmest Sep
• Lyon County 9th warmest Sep
• Madison County 7th warmest Sep
• Mahaska County 3rd warmest Sep
• Marion County 5th warmest Sep
• Marshall County 8th warmest Sep
• Mills County 4th warmest Sep
• Mitchell County 6th warmest Sep
• Monona County 1st warmest Sep
• Monroe County 3rd warmest Sep
• Montgomery County 3rd warmest Sep
• Muscatine County 1st warmest Sep
• O'Brien County 16th warmest Sep
• Osceola County 15th warmest Sep
• Page County 3rd warmest Sep
• Palo Alto County 10th warmest Sep
• Plymouth County 5th warmest Sep
• Pocahontas County 13th warmest Sep
• Polk County 10th warmest Sep
• Pottawattamie County 4th warmest Sep
• Poweshiek County 6th warmest Sep
• Ringgold County 3rd warmest Sep
• Sac County 6th warmest Sep
• Scott County 2nd warmest Sep
• Shelby County 5th warmest Sep
• Sioux County 10th warmest Sep
• Story County 9th warmest Sep
• Tama County 11th warmest Sep
• Taylor County 3rd warmest Sep
• Union County 5th warmest Sep
• Van Buren County 4th warmest Sep
• Wapello County 3rd warmest Sep
• Warren County 11th warmest Sep
• Washington County 3rd warmest Sep
• Wayne County 3rd warmest Sep
• Webster County 14th warmest Sep
• Winnebago County 9th warmest Sep
• Winneshiek County 15th warmest Sep
• Woodbury County 5th warmest Sep
• Worth County 6th warmest Sep
• Wright County 20th warmest Sep

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