National Weather Service Forecast for: Sun Prairie WI
Issued by: National Weather Service Milwaukee, WI
Updated: 5:12 pm CDT Jul 28, 2026
 
Tonight

Tonight: Mostly clear, with a low around 59. Northeast wind around 5 mph becoming calm in the evening.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 84. Calm wind.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 63. Calm wind.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 86. Southwest wind around 5 mph.
Mostly Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 65. South wind around 5 mph.
Mostly Cloudy
 Friday

Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 79. Southeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely
 Friday
Night
Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
Showers
Likely
 Saturday

Saturday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 80. Northeast wind around 10 mph.
Chance
Showers
 Saturday
Night
Saturday Night: Partly cloudy, with a low around 61.
Partly Cloudy
Lo 59 °F Hi 84 °F Lo 63 °F Hi 86 °F Lo 65 °F Hi 79 °F Lo 63 °F Hi 80 °F Lo 61 °F

Hazardous Weather Outlook
 

Tonight
 
 Mostly clear, with a low around 59. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
 
 Sunny, with a high near 84. Calm wind.
Wednesday Night
 
 Mostly clear, with a low around 63. Calm wind.
Thursday
 
 Mostly sunny, with a high near 86. Southwest wind around 5 mph.
Thursday Night
 
 Mostly cloudy, with a low around 65. South wind around 5 mph.
Friday
 
 A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 79. Southeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
Saturday
 
 A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 80. Northeast wind around 10 mph.
Saturday Night
 
 Partly cloudy, with a low around 61.
Sunday
 
 Mostly sunny, with a high near 81.
Sunday Night
 
 Mostly clear, with a low around 59.
Monday
 
 Sunny, with a high near 84.
Monday Night
 
 Mostly clear, with a low around 62.
Tuesday
 
 Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Sun Prairie WI.