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Town of Sullivan, WISullivan, WI Weather Forecast
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Sullivan Weather Forecast
| TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  | |  |  | | | |  | | |  |
| Partly Cloudy | Mostly Sunny | Partly Cloudy | Chance of Showers | Chance of T-Storm | Chance of Showers | Partly Cloudy | Mostly Sunny | Clear | Sunny | Chance of T-Storm | Chance of T-Storm |
| Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C |
| POP: 20% | POP: 90% | POP: 20% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 731 PM CDT Sun Sep 06 2026 
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Issued: 703 PM CDT Sun Sep 6 2026
Key Messages
- Mild and pleasant weather continues through Labor Day.
- Patchy dense fog expected in low-lying areas of southwestern Wisconsin tonight into early Monday morning.
- A Moderate to High Swim Risk may develop for Lake MI beaches in Sheboygan and Ozaukee Counties for Tue-Tue evening.
- Warmer temps and higher humidity returns for Tue-Wed. There are 40-60% chances for showers on Tuesday mainly well north and west of the MKE metro area, followed by 60-90% chances for showers and thunderstorms Tu...