Cottage Grove, WI Weather

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Cottage Grove, WI

Updated: Sep-01-2026 4:19pm

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

Updated: Tue, Sep-01-2026 2:46pm CDT

Cottage Grove

This Afternoon Chance Showers And T-Storms	Wednesday Partly Sunny	Thursday Chance Showers And T-Storms	Friday Showers And T-Storms Likely	Saturday Chance Showers And T-Storms	Sunday Chance Showers And T-Storms	Labor Day Slight Chance Rain Showers
Hi 89 °F	Hi 89 °F	Hi 87 °F	Hi 86 °F	Hi 85 °F	Hi 83 °F	Hi 78 °F

Tonight Partly Cloudy	Wednesday Night Partly Cloudy then Chance Showers And T-Storms	Thursday Night Chance Showers And T-Storms then Showers And T-Storms Likely	Friday Night Chance Showers And T-Storms	Saturday Night Partly Cloudy then Slight Chance Showers And T-Storms	Sunday Night Slight Chance Rain Showers	Monday Night Slight Chance Rain Showers
Lo 72 °F	Lo 72 °F	Lo 69 °F	Lo 67 °F	Lo 65 °F	Lo 63 °F	Lo 59 °F

This Afternoon	A chance of showers and thunderstorms. Partly sunny, with a high near 89. Heat index values as high as 95. Southwest wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Tonight	Partly cloudy, with a low around 72. Southwest wind 0 to 5 mph. New rainfall amounts less than a tenth of an inch possible.
Wednesday	Partly sunny, with a high near 89. Heat index values as high as 95. Southwest wind 0 to 10 mph.
Wednesday Night	A chance of showers and thunderstorms between 1am and 2am, then a slight chance of showers and thunderstorms between 2am and 3am, then a chance of showers and thunderstorms between 3am and 4am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 72. Southwest wind 0 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Thursday	A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm. Partly sunny, with a high near 87. Southwest wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Thursday Night	A chance of showers and thunderstorms between 7pm and 10pm, then showers and thunderstorms likely. Partly cloudy, with a low around 69. Southeast wind 0 to 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Friday	Showers and thunderstorms likely before 1pm. Partly sunny, with a high near 86. South wind around 5 mph. Chance of precipitation is 60%. 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 around 0 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Saturday	A chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 50%.
Saturday Night	A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 65. Chance of precipitation is 20%.
Sunday	A chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 40%.
Sunday Night	A slight chance of rain showers. Mostly cloudy, with a low around 63. Chance of precipitation is 20%.
Labor Day	A slight chance of rain showers. Partly sunny, with a high near 78. Chance of precipitation is 20%.
Monday Night	A slight chance of rain showers. Mostly cloudy, with a low around 59. Chance of precipitation is 20%.

Forecast from NOAA-NWS for Cottage Grove, WI.