Cottage Grove, WI Weather

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Cottage Grove, WI

Updated: Jun-30-2026 8:40pm

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National Weather Service Forecast for: Cottage Grove, WI
Issued by: National Weather Service Milwaukee/Sullivan/Dousman, WI

Updated: Tue, Jun-30-2026 7:26pm CDT

Cottage Grove

	Wednesday Slight Chance Rain Showers then Mostly Sunny	Thursday Slight Chance Showers And T-Storms then Chance Showers And T-Storms	Friday Chance Showers And T-Storms	Independence Day Showers And T-Storms Likely then Chance Showers And T-Storms	Sunday Showers And T-Storms Likely	Monday Slight Chance Rain Showers then Mostly Sunny	Tuesday Mostly Sunny then Slight Chance Rain Showers
	Hi 92 °F	Hi 90 °F	Hi 89 °F	Hi 83 °F	Hi 82 °F	Hi 84 °F	Hi 85 °F

Tonight Mostly Cloudy	Wednesday Night Chance Showers And T-Storms	Thursday Night Chance Showers And T-Storms	Friday Night Chance Showers And T-Storms	Saturday Night Showers And T-Storms Likely	Sunday Night Chance Showers And T-Storms	Monday Night Partly Cloudy
Lo 77 °F	Lo 74 °F	Lo 71 °F	Lo 69 °F	Lo 66 °F	Lo 65 °F	Lo 64 °F

Extreme Heat Warning issued June 30 at 7:20PM CDT until July 1 at 7:00PM CDT
Extreme Heat Warning issued June 30 at 1:40PM CDT until July 1 at 7:00PM CDT

Tonight	Mostly cloudy, with a low around 77. Heat index values as high as 100. Southwest wind around 10 mph.
Wednesday	A slight chance of rain showers between 7am and 8am. Mostly sunny, with a high near 92. Heat index values as high as 100. Southwest wind 10 to 15 mph. Chance of precipitation is 20%.
Wednesday Night	A chance of showers and thunderstorms between 11pm and 4am. Partly cloudy, with a low around 74. Heat index values as high as 98. Southwest wind 10 to 15 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Thursday	A slight chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Thursday Night	A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then scattered showers and thunderstorms. Mostly cloudy, with a low around 71. Southwest wind 0 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Friday	Scattered rain showers before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 89. Southwest wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Friday Night	A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Northwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Independence Day	Showers and thunderstorms likely before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then showers and thunderstorms likely. Partly sunny, with a high near 83. Northeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night	Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Sunday	Showers and thunderstorms likely. Partly sunny, with a high near 82. Chance of precipitation is 60%.
Sunday Night	A chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Monday	A slight chance of rain showers before 7am. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Monday Night	Partly cloudy, with a low around 64.
Tuesday	A slight chance of rain showers after 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.

Forecast from NOAA-NWS for Cottage Grove, WI.