National Weather Service Forecast for: Sun Prairie WI
Issued by: National Weather Service Milwaukee, WI
Updated: 12:36 am CST Dec 5, 2025
 
Overnight

Overnight: Mostly cloudy, with a low around 3. Wind chill values between -5 and -10. Southwest wind 10 to 15 mph.
Mostly Cloudy

 Friday

Friday: A slight chance of snow and freezing rain after 2pm. Mostly cloudy, with a high near 26. Wind chill values between -5 and 5. Southwest wind around 10 mph. Chance of precipitation is 20%.
Mostly Cloudy
then Slight
Chance Wintry
Mix
 Friday
Night
Friday Night: A chance of snow and freezing rain before midnight. Mostly cloudy, with a low around 17. Southwest wind around 10 mph becoming northwest after midnight. Chance of precipitation is 40%.
Chance Wintry
Mix then
Mostly Cloudy
 Saturday

Saturday: Partly sunny, with a high near 23. Northwest wind around 5 mph becoming calm in the afternoon.
Partly Sunny

 Saturday
Night
Saturday Night: Snow likely, mainly after midnight. Mostly cloudy, with a low around 9. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Chance Snow
then Snow
Likely
 Sunday

Sunday: A 20 percent chance of snow before noon. Partly sunny, with a high near 18. North wind 5 to 10 mph.
Slight Chance
Snow then
Mostly Sunny
 Sunday
Night
Sunday Night: Partly cloudy, with a low around -6. North wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Monday

Monday: A 20 percent chance of snow after noon. Partly sunny, with a high near 20. Light and variable wind becoming south 5 to 10 mph in the morning.
Partly Sunny
then Slight
Chance Snow
 Monday
Night
Monday Night: Snow. Temperature falling to near 15 by 8pm, then rising to around 22 during the remainder of the night. Chance of precipitation is 80%.
Snow
Lo 3 °F Hi 26 °F Lo 17 °F Hi 23 °F Lo 9 °F Hi 18 °F Lo -6 °F Hi 20 °F Lo 15 °F⇑

Hazardous Weather Outlook
 

Overnight
 
 Mostly cloudy, with a low around 3. Wind chill values between -5 and -10. Southwest wind 10 to 15 mph.
Friday
 
 A slight chance of snow and freezing rain after 2pm. Mostly cloudy, with a high near 26. Wind chill values between -5 and 5. Southwest wind around 10 mph. Chance of precipitation is 20%.
Friday Night
 
 A chance of snow and freezing rain before midnight. Mostly cloudy, with a low around 17. Southwest wind around 10 mph becoming northwest after midnight. Chance of precipitation is 40%.
Saturday
 
 Partly sunny, with a high near 23. Northwest wind around 5 mph becoming calm in the afternoon.
Saturday Night
 
 Snow likely, mainly after midnight. Mostly cloudy, with a low around 9. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Sunday
 
 A 20 percent chance of snow before noon. Partly sunny, with a high near 18. North wind 5 to 10 mph.
Sunday Night
 
 Partly cloudy, with a low around -6. North wind around 5 mph becoming calm in the evening.
Monday
 
 A 20 percent chance of snow after noon. Partly sunny, with a high near 20. Light and variable wind becoming south 5 to 10 mph in the morning.
Monday Night
 
 Snow. Temperature falling to near 15 by 8pm, then rising to around 22 during the remainder of the night. Chance of precipitation is 80%.
Tuesday
 
 A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 29.
Tuesday Night
 
 Snow likely. Mostly cloudy, with a low around 17. Chance of precipitation is 70%.
Wednesday
 
 Snow likely. Mostly cloudy, with a high near 28. Chance of precipitation is 60%.
Wednesday Night
 
 A 30 percent chance of snow. Mostly cloudy, with a low around 6.
Thursday
 
 A 30 percent chance of snow. Partly sunny, with a high near 20.

 

Forecast from NOAA-NWS for Sun Prairie WI.