Cottage Grove, WI Weather

70°F

Cottage Grove, WI

Updated: Aug-30-2026 10:50pm

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

Updated: Sun, Aug-30-2026 9:46pm CDT

Cottage Grove

	Monday Chance Showers And T-Storms then Slight Chance Showers And T-Storms	Tuesday Slight Chance Showers And T-Storms	Wednesday Slight Chance Rain Showers then Mostly Sunny	Thursday Chance Showers And T-Storms	Friday Chance Showers And T-Storms then Slight Chance Showers And T-Storms	Saturday Slight Chance Showers And T-Storms	Sunday Mostly Sunny
	Hi 87 °F	Hi 89 °F	Hi 89 °F	Hi 84 °F	Hi 84 °F	Hi 84 °F	Hi 82 °F

Tonight Chance Showers And T-Storms	Monday Night Chance Showers And T-Storms then Partly Cloudy	Tuesday Night Mostly Cloudy then Slight Chance Showers And T-Storms	Wednesday Night Chance Showers And T-Storms	Thursday Night Chance Showers And T-Storms	Friday Night Partly Cloudy then Slight Chance Showers And T-Storms	Saturday Night Partly Cloudy
Lo 69 °F	Lo 71 °F	Lo 70 °F	Lo 68 °F	Lo 66 °F	Lo 64 °F	Lo 62 °F

Tonight	A chance of showers and thunderstorms before 3am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
Monday	A chance of showers and thunderstorms before 9am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind around 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Monday Night	A chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 71. Southwest wind 0 to 10 mph. Chance of precipitation is 30%.
Tuesday	A slight chance of showers and thunderstorms between 7am and 1pm. Partly sunny, with a high near 89. Heat index values as high as 96. Southwest wind 0 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Tuesday Night	A slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. Southwest wind 0 to 5 mph. Chance of precipitation is 20%.
Wednesday	A slight chance of rain showers before 7am. Mostly sunny, with a high near 89. South wind 0 to 5 mph. Chance of precipitation is 20%.
Wednesday Night	A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 68. 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 1pm. Partly sunny, with a high near 84. Southeast 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 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
Friday	A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 50%.
Friday Night	A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Saturday	A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Saturday Night	Partly cloudy, with a low around 62.
Sunday	Mostly sunny, with a high near 82.

Forecast from NOAA-NWS for Cottage Grove, WI.