| National Weather Service Forecast for:
Sun Prairie, WI Issued by: National Weather Service Milwaukee/Sullivan/Dousman, WI |
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| Updated: 05/17/2026 6:31pm | ||||||||||||||||||||||||||||||||||||||||
| Sun Prairie WI | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
A chance of showers and thunderstorms between 2am and 4am, then showers and thunderstorms likely. Mostly cloudy, with a low around 64. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible. |
| Monday |
Showers and thunderstorms likely before 10am, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Monday Night |
A chance of showers and thunderstorms before 1am, then showers and thunderstorms. Mostly cloudy, with a low around 62. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Tuesday |
Showers and thunderstorms before 1pm. Partly sunny. High near 73, with temperatures falling to around 66 in the afternoon. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Tuesday Night |
Partly cloudy, with a low around 44. Northwest wind 10 to 15 mph. |
| Wednesday |
Mostly sunny, with a high near 61. North wind 5 to 10 mph. |
| Wednesday Night |
Partly cloudy, with a low around 39. Northeast wind 0 to 5 mph. |
| Thursday |
Mostly sunny, with a high near 64. East wind 0 to 10 mph. |
| Thursday Night |
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 43. Chance of precipitation is 20%. |
| Friday |
A slight chance of rain showers. Partly sunny, with a high near 69. Chance of precipitation is 20%. |
| Friday Night |
A slight chance of rain showers. Mostly cloudy, with a low around 48. Chance of precipitation is 20%. |
| Saturday |
A slight chance of rain showers before 7am. Partly sunny, with a high near 74. Chance of precipitation is 20%. |
| Saturday Night |
Mostly cloudy, with a low around 52. |
| Sunday |
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. Chance of precipitation is 20%. |
Forecast from NOAA-NWS for Sun Prairie, WI.