Cottage Grove, WI Weather

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Cottage Grove, WI

Updated: Sep-01-2026 3:28am

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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 2:41am CDT

Cottage Grove

	Tuesday Patchy Fog then Slight Chance Rain Showers	Wednesday Mostly Sunny then Slight Chance Showers And T-Storms	Thursday Slight Chance Showers And T-Storms then Showers And T-Storms Likely	Friday Chance Showers And T-Storms	Saturday Slight Chance Showers And T-Storms	Sunday Chance Rain Showers	Labor Day Slight Chance Rain Showers then Partly Sunny
	Hi 90 °F	Hi 89 °F	Hi 86 °F	Hi 88 °F	Hi 87 °F	Hi 84 °F	Hi 78 °F

Overnight Patchy Fog	Tuesday Night Slight Chance Showers And T-Storms	Wednesday Night Chance Showers And T-Storms	Thursday Night Partly Cloudy then Chance Showers And T-Storms	Friday Night Chance Showers And T-Storms	Saturday Night Chance Rain Showers	Sunday Night Slight Chance Rain Showers
Lo 70 °F	Lo 71 °F	Lo 69 °F	Lo 69 °F	Lo 69 °F	Lo 67 °F	Lo 63 °F

Overnight	Patchy fog. Mostly cloudy, with a low around 70. West wind around 0 mph.
Tuesday	Patchy fog before 9am, then a slight chance of rain showers between 2pm and 4pm. Partly sunny, with a high near 90. Heat index values as high as 96. Southwest wind 0 to 10 mph. Chance of precipitation is 20%.
Tuesday Night	A slight chance of showers and thunderstorms before 5am. Partly cloudy, with a low around 71. Southwest wind 0 to 5 mph. Chance of precipitation is 20%.
Wednesday	A slight chance of showers and thunderstorms between 1pm and 2pm. Mostly sunny, with a high near 89. Heat index values as high as 95. South wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Wednesday Night	A chance of showers and thunderstorms between 7pm and 1am, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 69. Southwest wind 0 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Thursday	A slight chance of showers and thunderstorms before 7am, then showers and thunderstorms likely between 7am and 1pm. Partly sunny, with a high near 86. South wind 0 to 5 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Thursday Night	A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69. Southeast wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Friday	A chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88. South wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a half and three quarters of an inch possible.
Friday Night	A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
Saturday	A chance of rain showers before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Saturday Night	A chance of rain showers after 7pm. Partly cloudy, with a low around 67. Chance of precipitation is 40%.
Sunday	A chance of rain showers before 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 40%.
Sunday Night	A slight chance of rain showers after 7pm. Partly cloudy, with a low around 63. Chance of precipitation is 20%.
Labor Day	A slight chance of rain showers before 7am. Partly sunny, with a high near 78. Chance of precipitation is 20%.

Forecast from NOAA-NWS for Cottage Grove, WI.