National Weather Service Forecast for: Sun Prairie WI
Issued by: National Weather Service Milwaukee, WI
Updated: 6:11 pm CST Dec 17, 2025
 
Tonight

Tonight: Rain likely, mainly after 5am. Mostly cloudy, with a temperature rising to around 37 by 4am. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Rain
Likely
 Thursday

Thursday: Rain before 2pm, then snow showers likely. Temperature rising to near 39 by 8am, then falling to around 28 during the remainder of the day. Breezy, with a south wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Rain then
Rain/Snow
Likely and
Breezy
 Thursday
Night
Thursday Night: A 30 percent chance of snow showers, mainly before 9pm. Mostly cloudy, with a low around 6. Wind chill values between -10 and zero. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.
Breezy.
Chance Snow
Showers then
Mostly Cloudy
 Friday

Friday: Mostly sunny, with a high near 23. Wind chill values between -10 and zero. Northwest wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 30 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly cloudy, with a temperature falling to near 17 by 9pm, then rising to around 27 during the remainder of the night. South wind around 10 mph.
Mostly Cloudy

 Saturday

Saturday: A slight chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 35. South wind 10 to 15 mph becoming northwest in the afternoon. Chance of precipitation is 20%.
Slight Chance
Rain/Snow
then Slight
Chance Snow
 Saturday
Night
Saturday Night: Mostly clear, with a low around 7. West wind 10 to 15 mph.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 21. West wind 5 to 10 mph.
Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a steady temperature around 16.
Partly Cloudy
Lo 30 °F⇑ Hi 39 °F⇓ Lo 6 °F Hi 23 °F Lo 17 °F⇑ Hi 35 °F Lo 7 °F Hi 21 °F Lo 16 °F

 

Tonight
 
 Rain likely, mainly after 5am. Mostly cloudy, with a temperature rising to around 37 by 4am. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
 
 Rain before 2pm, then snow showers likely. Temperature rising to near 39 by 8am, then falling to around 28 during the remainder of the day. Breezy, with a south wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Thursday Night
 
 A 30 percent chance of snow showers, mainly before 9pm. Mostly cloudy, with a low around 6. Wind chill values between -10 and zero. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.
Friday
 
 Mostly sunny, with a high near 23. Wind chill values between -10 and zero. Northwest wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 30 mph.
Friday Night
 
 Mostly cloudy, with a temperature falling to near 17 by 9pm, then rising to around 27 during the remainder of the night. South wind around 10 mph.
Saturday
 
 A slight chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 35. South wind 10 to 15 mph becoming northwest in the afternoon. Chance of precipitation is 20%.
Saturday Night
 
 Mostly clear, with a low around 7. West wind 10 to 15 mph.
Sunday
 
 Sunny, with a high near 21. West wind 5 to 10 mph.
Sunday Night
 
 Partly cloudy, with a steady temperature around 16.
Monday
 
 Mostly cloudy, with a high near 34.
Monday Night
 
 Mostly cloudy, with a low around 28.
Tuesday
 
 Partly sunny, with a high near 39.
Tuesday Night
 
 Mostly cloudy, with a low around 21.
Wednesday
 
 Partly sunny, with a high near 35.

 

Forecast from NOAA-NWS for Sun Prairie WI.