Cottage Grove, WI Weather

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Cottage Grove, WI

Updated: Aug-31-2026 2:29pm

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

Updated: Mon, Aug-31-2026 1:35pm CDT

Cottage Grove

This Afternoon Showers And T-Storms Likely	Tuesday Patchy Fog then Partly Sunny	Wednesday Mostly Sunny	Thursday Showers And T-Storms Likely	Friday Showers And T-Storms Likely then Chance Showers And T-Storms	Saturday Chance Showers And T-Storms	Sunday Slight Chance Rain Showers then Slight Chance Showers And T-Storms
Hi 88 °F	Hi 90 °F	Hi 89 °F	Hi 85 °F	Hi 86 °F	Hi 83 °F	Hi 82 °F

Tonight Slight Chance Showers And T-Storms then Patchy Fog	Tuesday Night Partly Cloudy	Wednesday Night Partly Cloudy then Chance Showers And T-Storms	Thursday Night Slight Chance Showers And T-Storms	Friday Night Chance Showers And T-Storms	Saturday Night Partly Cloudy then Slight Chance Rain Showers	Sunday Night Slight Chance Showers And T-Storms
Lo 70 °F	Lo 71 °F	Lo 70 °F	Lo 68 °F	Lo 66 °F	Lo 64 °F	Lo 62 °F

This Afternoon	Showers and thunderstorms likely. Partly sunny, with a high near 88. Southwest wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Tonight	A slight chance of showers and thunderstorms before 8pm, then patchy fog. Mostly cloudy, with a low around 70. Southwest wind 0 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Tuesday	Patchy fog before 9am. Partly sunny, with a high near 90. Heat index values as high as 96. West wind 0 to 5 mph. New rainfall amounts less than a tenth of an inch possible.
Tuesday Night	Partly cloudy, with a low around 71. Southwest wind 0 to 5 mph.
Wednesday	Mostly sunny, with a high near 89. Southwest wind 5 to 10 mph.
Wednesday Night	A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. West wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Thursday	Showers and thunderstorms likely before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 85. Southeast wind 0 to 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Thursday Night	A slight chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Partly cloudy, with a low around 68. Southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Friday	Showers and thunderstorms likely before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Friday Night	A chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 40%.
Saturday	A chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 83. Chance of precipitation is 40%.
Saturday Night	A slight chance of rain showers after 1am. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Sunday	A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 82. Chance of precipitation is 20%.
Sunday Night	A slight chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 20%.

Forecast from NOAA-NWS for Cottage Grove, WI.