| NWS Forecast for: Sullivan WI Issued by: National Weather Service Milwaukee, WI Last Update: 3:32 am CDT Sep 12, 2026 | |
| Overnight: Mostly cloudy, with a low around 61. South wind around 5 mph. Saturday: Mostly sunny, with a high near 81. South wind 5 to 10 mph becoming northwest in the afternoon. Saturday Night: Mostly clear, with a low around 53. Northwest wind around 5 mph. Sunday: A 40 percent chance of showers, mainly before 3pm. Partly sunny, with a high near 67. Light north wind becoming northwest 5 to 10 mph in the morning. Sunday Night: Mostly clear, with a low around 46. Northwest wind around 5 mph becoming calm. Monday: A 20 percent chance of showers after 1pm. Increasing clouds, with a high near 70. Light and variable wind becoming southeast 10 to 15 mph in the morning. Monday Night: A chance of showers, then showers and possibly a thunderstorm after 1am. Low around 62. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible. Tuesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Cloudy, with a high near 77. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. Tuesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 56. Wednesday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 72. Chance of precipitation is 60%. Wednesday Night: Showers likely. The rain could be heavy at times. Mostly cloudy, with a low around 57. Chance of precipitation is 60%. Thursday: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 74. Thursday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 54. Friday: A 20 percent chance of showers. Mostly sunny, with a high near 74. | |
| Sullivan WI 43°N 88.6°W (Elev. 846 ft) | |
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