National Weather Service Forecast for: Sun Prairie WI
Issued by: National Weather Service Milwaukee, WI
Updated: 11:31 am CDT May 4, 2026
 
This
Afternoon
This Afternoon: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Increasing clouds, with a high near 78. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Chance
T-storms and
Breezy
 Tonight

Tonight: A chance of rain and thunderstorms before 2am, then a chance of rain between 2am and 4am. Mostly cloudy, with a low around 41. Northwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Chance
T-storms then
Slight Chance
Showers
 Tuesday

Tuesday: Partly sunny, with a high near 56. Northwest wind 5 to 10 mph.
Partly Sunny

 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 36. Northwest wind around 5 mph.
Mostly Cloudy

 Wednesday

Wednesday: Mostly sunny, with a high near 55. Northwest wind 5 to 10 mph.
Mostly Sunny

 Wednesday
Night
Wednesday Night: Areas of frost after 3am. Otherwise, mostly cloudy, with a low around 36. Northwest wind around 5 mph becoming calm in the evening.
Mostly Cloudy
then Areas
Frost
 Thursday

Thursday: A 20 percent chance of showers after 1pm. Areas of frost before 7am. Otherwise, mostly sunny, with a high near 58. Light west wind increasing to 5 to 10 mph in the morning.
Areas Frost
then Slight
Chance
Showers
 Thursday
Night
Thursday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 38. West wind around 5 mph becoming calm in the evening.
Slight Chance
Showers

 Friday

Friday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 61.
Sunny then
Slight Chance
Showers
Hi 78 °F Lo 41 °F Hi 56 °F Lo 36 °F Hi 55 °F Lo 36 °F Hi 58 °F Lo 38 °F Hi 61 °F

Special Weather Statement
Hazardous Weather Outlook
 

This Afternoon
 
 A 30 percent chance of showers and thunderstorms, mainly after 4pm. Increasing clouds, with a high near 78. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
 
 A chance of rain and thunderstorms before 2am, then a chance of rain between 2am and 4am. Mostly cloudy, with a low around 41. Northwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Tuesday
 
 Partly sunny, with a high near 56. Northwest wind 5 to 10 mph.
Tuesday Night
 
 Mostly cloudy, with a low around 36. Northwest wind around 5 mph.
Wednesday
 
 Mostly sunny, with a high near 55. Northwest wind 5 to 10 mph.
Wednesday Night
 
 Areas of frost after 3am. Otherwise, mostly cloudy, with a low around 36. Northwest wind around 5 mph becoming calm in the evening.
Thursday
 
 A 20 percent chance of showers after 1pm. Areas of frost before 7am. Otherwise, mostly sunny, with a high near 58. Light west wind increasing to 5 to 10 mph in the morning.
Thursday Night
 
 A 20 percent chance of showers before 1am. Partly cloudy, with a low around 38. West wind around 5 mph becoming calm in the evening.
Friday
 
 A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 61.
Friday Night
 
 Partly cloudy, with a low around 39.
Saturday
 
 Sunny, with a high near 66.
Saturday Night
 
 A 20 percent chance of showers. Partly cloudy, with a low around 44.
Sunday
 
 A 20 percent chance of showers. Mostly sunny, with a high near 66.

 

Forecast from NOAA-NWS for Sun Prairie WI.