Average May Temperatures for Wisconsin

Average temperatures for May 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 May temperatures
High °F	Low °F	Place	High °C	Low °C
67	46	Appleton	20	8
66	40	Crivitz, High Falls Flowage	19	4
66	46	Fond du Lac	19	8
67	46	Green Bay	20	8
64	47	Kenosha	18	8
72	48	Lake Geneva	22	9
62	44	Manitowoc	16	7
64	44	Marinette	18	7
67	48	Milwaukee	19	9
67	48	Oshkosh	20	9
61	46	Racine	16	8
63	46	Sheboygan	17	8
62	43	Sturgeon Bay	17	6
59	40	Washington Island	15	4
68	47	Watertown	20	8
69	47	Whitewater	20	8

Southwest Wisconsin

Average daily temperatures in May
High °F	Low °F	Place	High °C	Low °C
70	46	Baraboo	21	8
67	46	Beaver Dam	19	8
67	46	Beloit	19	8
72	50	La Crosse	22	10
69	47	Madison	21	8
69	47	Platteville	20	8
70	48	Prairie du Chien	21	9
66	45	Viroqua	19	7
69	45	Wisconsin Dells	21	7
68	44	Wisconsin Rapids	20	6

Northern Wisconsin

May temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
64	41	Drummond	18	5
70	45	Eau Claire	21	7
65	43	Park Falls	18	6
65	41	Rest Lake, Manitowish Waters	18	5
65	40	Rhinelander	18	5
68	45	Rice Lake	20	7
68	43	River Falls	20	6
68	46	St Croix Falls	20	8
67	45	Stevens Point	19	7
67	45	Wausau	20	7
63	41	Willow Reservoir	17	5

Lake Superior Shore

Average May temperatures
High °F	Low °F	Place	High °C	Low °C
64	39	Ashland	18	4
63	41	Bayfield	17	5
64	41	Hurley	18	5
61	38	Madeline Island	16	4
57	41	Superior	14	5

Average Temperatures for Wisconsin in May

Eastern Wisconsin

Southwest Wisconsin

Northern Wisconsin

Lake Superior Shore

Reference

More Wisconsin Weather Information