Average September Temperatures for Wisconsin

Average temperatures for September at cities, communities and lakes throughout Wisconsin are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for each region of the state: Eastern Wisconsin, Southwest Wisconsin, Northern Wisconsin and the Lake Superior Shore.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Eastern Wisconsin

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
72	51	Appleton	22	10
69	44	Crivitz, High Falls Flowage	21	7
71	51	Fond du Lac	21	11
72	50	Green Bay	22	10
72	56	Kenosha	22	13
76	54	Lake Geneva	25	12
69	53	Manitowoc	20	12
70	51	Marinette	21	11
74	56	Milwaukee	23	14
73	53	Oshkosh	23	12
71	56	Racine	21	13
72	55	Sheboygan	22	13
69	51	Sturgeon Bay	21	10
68	51	Washington Island	20	10
73	51	Watertown	23	10
74	51	Whitewater	23	10

Southwest Wisconsin

Average daily temperatures in September
High °F	Low °F	Place	High °C	Low °C
74	50	Baraboo	23	10
72	50	Beaver Dam	22	10
71	50	Beloit	22	10
76	54	La Crosse	24	12
73	51	Madison	23	11
73	51	Platteville	23	11
74	52	Prairie du Chien	23	11
70	48	Viroqua	21	9
73	49	Wisconsin Dells	23	9
71	47	Wisconsin Rapids	22	8

Northern Wisconsin

September temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
68	48	Drummond	20	9
72	49	Eau Claire	22	10
67	47	Park Falls	20	8
67	45	Rest Lake, Manitowish Waters	20	7
68	45	Rhinelander	20	7
71	48	Rice Lake	22	9
71	49	River Falls	22	9
72	50	St Croix Falls	22	10
70	50	Stevens Point	21	10
70	49	Wausau	21	9
67	46	Willow Reservoir	19	8

Lake Superior Shore

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
69	46	Ashland	21	8
68	48	Bayfield	20	9
67	47	Hurley	20	8
68	48	Madeline Island	20	9
67	50	Superior	19	10

Average Temperatures for Wisconsin in September

Eastern Wisconsin

Southwest Wisconsin

Northern Wisconsin

Lake Superior Shore

Reference

More Wisconsin Weather Information