Cottage Grove, WI Weather

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Cottage Grove, WI

Updated: Sep-02-2026 5:04pm

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

Updated: Wed, Sep-02-2026 1:34pm CDT

Cottage Grove

This Afternoon Slight Chance Showers And T-Storms	Thursday Chance Showers And T-Storms	Friday Showers And T-Storms then Slight Chance Showers And T-Storms	Saturday Slight Chance Showers And T-Storms	Sunday Slight Chance Showers And T-Storms	Labor Day Chance Showers And T-Storms	Tuesday Chance Rain Showers
Hi 89 °F	Hi 85 °F	Hi 87 °F	Hi 85 °F	Hi 83 °F	Hi 82 °F	Hi 81 °F

Tonight Slight Chance Showers And T-Storms	Thursday Night Chance Showers And T-Storms then Showers And T-Storms	Friday Night Chance Showers And T-Storms	Saturday Night Slight Chance Showers And T-Storms	Sunday Night Partly Cloudy then Chance Showers And T-Storms	Monday Night Mostly Cloudy then Slight Chance Rain Showers	Tuesday Night Chance Rain Showers
Lo 71 °F	Lo 68 °F	Lo 67 °F	Lo 64 °F	Lo 64 °F	Lo 63 °F	Lo 66 °F

This Afternoon	A slight chance of showers and thunderstorms. Partly sunny, with a high near 89. Heat index values as high as 96. Southwest wind around 5 mph. Chance of precipitation is 20%.
Tonight	Scattered rain showers before 8pm, then a slight chance of showers and thunderstorms between 11pm and 3am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 71. Southeast wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Thursday	A chance of showers and thunderstorms before 10am, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. South wind 0 to 10 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Thursday Night	A chance of showers and thunderstorms before midnight, then showers and thunderstorms. Mostly cloudy, with a low around 68. Southeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Friday	Showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Partly sunny, with a high near 87. Southeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night	A chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 67. Southeast wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Saturday	A chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 85. East wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Saturday Night	A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64. East wind 0 to 5 mph. Chance of precipitation is 20%.
Sunday	A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 83. Chance of precipitation is 20%.
Sunday Night	A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
Labor Day	A chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 82. Chance of precipitation is 30%.
Monday Night	A slight chance of rain showers after 1am. Mostly cloudy, with a low around 63. Chance of precipitation is 20%.
Tuesday	A chance of rain showers before 1pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Tuesday Night	A chance of rain showers after 7pm. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.

Forecast from NOAA-NWS for Cottage Grove, WI.