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.

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• Madison - September »
  On the first day of September in Madison sunrise is at 6:22 am and sunset at 7:31 pm. In September, in Madison the rain falls for 3.5 days.
• Milwaukee - September »
  In Milwaukee during September, the rain falls for 6.4 days and regularly aggregates up to 0.35" (9mm) of precipitation. In September, the average ocean temperature in Milwaukee, Wisconsin, is 66.9°F (19.4°C).
• Green Bay - September »
  On the first day of September in Green Bay, Wisconsin, sunrise is at 6:15 am and sunset at 7:28 pm. In Green Bay, during September, the rain falls for 11.6 days and regularly aggregates up to 1.57" (40mm) of precipitation.
• Kenosha - September »
  In Kenosha in September, during 12.7 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. In Kenosha in September, the average water temperature is 67.6°F (19.8°C).
• Racine - September »
  In Racine in September, during 10.6 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. September marks a gentle change in average high-temperature in Racine, Wisconsin, declining from August's moderately hot 75°F (23.9°C) to an agreeable 69.1°F (20.6°C).
• Appleton - September »
  In Appleton, Wisconsin, in September, it is raining for 12.1 days, with typically 1.81" (46mm) of accumulated precipitation. In Appleton, Wisconsin, in September, it is raining for 12.1 days, with typically 1.81" (46mm) of accumulated precipitation.
• Waukesha - September »
  On the last day of September, in Waukesha, sunrise is at 6:49 am and sunset at 6:35 pm CDT. In Waukesha snow does not fall in May through September.
• Eau Claire - September »
  On the first day of September in Eau Claire, sunrise is at 6:29 am and sunset at 7:42 pm. In Eau Claire snow does not fall in June through September.
• Oshkosh - September »
  In Oshkosh, in September, during 12 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. During the month of September, Oshkosh experiences a steady low-temperature average of 52.3°F (11.3°C).
• Janesville - September »
  In Janesville, during September, the rain falls for 10.5 days and regularly aggregates up to 1.22" (31mm) of precipitation. On the last day of September, in Janesville, sunrise is at 6:53 am and sunset at 6:38 pm CDT.
• West Allis - September »
  On the first day of September in West Allis sunrise is at 6:17 am and sunset at 7:26 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 »
  On the first day of September in La Crosse sunrise is at 6:29 am and sunset at 7:40 pm. On the first day of September in La Crosse, sunrise is at 6:29 am and sunset at 7:40 pm.