September weather forecast
Wisconsin, USA

September in Wisconsin marks the beginning of autumn, a season heralded by milder temperatures and a kaleidoscope of changing foliage. In the northern part of the state, temperatures range from 45°F (7.2°C) to 70°F (21.1°C), whereas the southern regions experience a milder spectrum from 55°F (12.8°C) to 75°F (23.9°C). The month shows a clear transition from the warmth of August, introducing cooler air, particularly in the evenings.

Rainfall decreases from the summer months but remains adequate, contributing to the landscape's transformation. Thunderstorms become less frequent, and the possibility of flooding diminishes. However, the weather can still be unpredictable, with some years experiencing unseasonably warm or cool spells.

While Lake Michigan continues to influence the climate in eastern cities like Milwaukee, its effect becomes less prominent compared to the summer months. The lake's moderation of temperatures is still present but less impactful as the air naturally cools.

Daylight continues its decline, reducing the amount of available sunlight for outdoor activities. Yet, this period is popular for apple picking, hiking, and enjoying the vibrant fall foliage, which begins its appearance in late September, especially in the northern regions.

September is a significant month for Wisconsin farmers. It often marks the harvest season for various crops, including early varieties of apples and the last cuttings of hay. As the temperature drops and daylight hours decrease, both agricultural and recreational activities reflect this seasonal shift. The state's natural beauty begins to transform, offering unique vistas that attract tourists and delight residents, setting the stage for the deeper changes that October will bring.

---

• Madison - September »
  On the first day of September sunrise is at 6:22 am and sunset at 7:33 pm. In Madison in September, it is raining for 3.5 days, with typically 0.43" (11mm) of accumulated precipitation.
• Milwaukee - September »
  In Milwaukee in September, during 6.4 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. In Milwaukee, Wisconsin, in September, it is raining for 6.4 days, with typically 0.35" (9mm) of accumulated precipitation.
• Green Bay - September »
  The mild weather, coupled with the beautiful fall foliage, makes September an ideal time for sightseeing and enjoying the natural beauty of Green Bay. September temperatures in Green Bay vary between a high-temperature of 69.6°F (20.9°C) and a low-temperature of 52.3°F (11.3°C).
• Kenosha - September »
  In Kenosha in September, it is raining for 12.7 days, with typically 2.2" (56mm) of accumulated precipitation. In Kenosha snow does not fall in June through September.
• Racine - September »
  On the last day of September, in Racine sunrise is at 6:47 am and sunset at 6:35 pm CDT. Racine experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a moderately hot 75°F (23.9°C) in August to an agreeable 69.1°F (20.6°C).
• Appleton - September »
  On the first day of September in Appleton sunrise is at 6:16 am and sunset at 7:30 pm. In Appleton, in September, during 12.1 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.
• Waukesha - September »
  In Waukesha, during September, the rain falls for 10.3 days and regularly aggregates up to 0.87" (22mm) of precipitation. In Waukesha, in September, during 10.3 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.
• Eau Claire - September »
  In Eau Claire in September, it is raining for 12.7 days, with typically 2.24" (57mm) of accumulated precipitation. In Eau Claire in September, it is raining for 12.7 days, with typically 2.24" (57mm) of accumulated precipitation.
• Oshkosh - September »
  On the first day of September in Oshkosh sunrise is at 6:17 am and sunset at 7:30 pm. Oshkosh records a mild change in average high-temperature during September, easing from a moderately hot 75.9°F (24.4°C) in August to a pleasant 69.4°F (20.8°C).
• Janesville - September »
  In Janesville, in September, during 10.5 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. In Janesville, in September, during 10.5 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.
• West Allis - September »
  On the first day of September in West Allis sunrise is at 6:16 am and sunset at 7:27 pm. September marks the cusp of fall in West Allis as temperatures start to moderate from the summer heat to a more pleasant range.
• La Crosse - September »
  In La Crosse snow does not fall in June through September. On the first day of September in La Crosse, Wisconsin, sunrise is at 6:28 am and sunset at 7:41 pm.