| National Weather Service Forecast for:
Sun Prairie, WI Issued by: National Weather Service Milwaukee/Sullivan/Dousman, WI |
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| Updated: 09/03/2026 10:41pm | ||||||||||||||||||||||||||||||||||||||||
| Sun Prairie WI | ||||||||||||||||||||||||||||||||||||||||
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| Overnight |
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. South wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Friday |
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Heat index values as high as 98. Southwest wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Friday Night |
A chance of showers and thunderstorms between 7pm and 10pm, then a chance of showers and thunderstorms between 10pm and midnight, then a slight chance of showers and thunderstorms between midnight and 1am, then patchy fog. Partly cloudy, with a low around 68. North wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible. |
| Saturday |
Patchy fog before 7am. Partly sunny, with a high near 83. Northeast wind around 5 mph. |
| Saturday Night |
Partly cloudy, with a low around 62. Northeast wind 0 to 5 mph. |
| Sunday |
Mostly sunny, with a high near 81. East wind 0 to 5 mph. |
| Sunday Night |
Partly cloudy, with a low around 60. East wind 0 to 5 mph. |
| Labor Day |
Partly sunny, with a high near 80. Southeast wind 0 to 5 mph. |
| Monday Night |
Mostly cloudy, with a low around 63. |
| Tuesday |
A chance of rain showers between 7am and 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 40%. |
| Tuesday Night |
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 69. Chance of precipitation is 60%. |
| Wednesday |
Showers and thunderstorms likely before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Partly sunny, with a high near 84. Chance of precipitation is 60%. |
| Wednesday Night |
A chance of rain showers after 7pm. Mostly cloudy, with a low around 64. Chance of precipitation is 30%. |
| Thursday |
A chance of rain showers before 1pm. Mostly sunny, with a high near 79. Chance of precipitation is 30%. |
Forecast from NOAA-NWS for Sun Prairie, WI.