September weather forecast
Illinois, USA

September marks the dawn of fall in Illinois, introducing a palpable shift in temperatures and a transformation in the landscape. The northern areas, bordering Wisconsin, usher in daytime temperatures that sit between the upper 60s°F to mid-70s°F. On the other hand, the southern regions, near Kentucky, enjoy warmer days, often in the mid to upper 70s°F.

Chicago, known for its diverse cultural and recreational offerings, is awash in a palette of changing colors. Lake Michigan, though its cooling influence persists, witnesses a drop in beach activities as the water temperature begins to descend. The city parks, meanwhile, become a canvas of golds, reds, and oranges, making them a haven for both residents and tourists.

September nights are crisp, with temperatures usually ranging from the mid-50s°F to low 60s°F. The cooling nights and decreasing daylight herald the steady march toward winter.

Comparing September with August, there's a clear decrease in temperatures, signifying the shift from summer to fall. Rain showers become more sporadic, and while thunderstorms can occur, they're less intense than the summer variants. By September's close, Illinois is firmly entrenched in the embrace of autumn, anticipating the cooler touch of October.

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• Chicago - September »
  On the first day of September in Chicago sunrise is at 6:16 am and sunset at 7:24 pm. In Chicago, in September, during 14.5 rainfall days, 3.23" (82mm) of precipitation is typically accumulated.
• Aurora - September »
  In Aurora, during September, the rain falls for 8.8 days and regularly aggregates up to 0.87" (22mm) of precipitation. How many hours of sunshine does Aurora have in September?
• Rockford - September »
  In September, in Rockford the rain falls for 11.8 days. In Rockford, in September, during 11.8 rainfall days, 2.13" (54mm) of precipitation is typically accumulated.
• Joliet - September »
  In Joliet during September, the rain falls for 12.5 days and regularly aggregates up to 2.48" (63mm) of precipitation. In Joliet, during September, the rain falls for 12.5 days and regularly aggregates up to 2.48" (63mm) of precipitation.
• Naperville - September »
  In Naperville, Illinois, in September, it is raining for 12.2 days, with typically 1.38" (35mm) of accumulated precipitation. In Naperville, Illinois, snow does not fall in May through September.
• Springfield - September »
  On the last day of September, in Springfield, sunrise is at 6:53 am and sunset at 6:43 pm CDT. In Springfield, in September, during 12.3 rainfall days, 2.28" (58mm) of precipitation is typically accumulated.
• Peoria - September »
  On the first day of September in Peoria sunrise is at 6:25 am and sunset at 7:31 pm. In Peoria during September, the rain falls for 10.5 days and regularly aggregates up to 1.42" (36mm) of precipitation.
• Elgin - September »
  In Elgin during September, the rain falls for 12.5 days and regularly aggregates up to 1.69" (43mm) of precipitation. In Elgin, in September, it is raining for 12.5 days, with typically 1.69" (43mm) of accumulated precipitation.
• Waukegan - September »
  In Waukegan, in September, it is raining for 12.7 days, with typically 1.73" (44mm) of accumulated precipitation. In Waukegan, in September, during 12.7 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.
• Champaign - September »
  The month with the least rainfall in Champaign is September, when the rain falls for 10.4 days and typically collects 0.94" (24mm) of precipitation. In Champaign, in September, during 10.4 rainfall days, 0.94" (24mm) of precipitation is typically accumulated.
• Cicero - September »
  On the first day of September in Cicero sunrise is at 6:16 am and sunset at 7:25 pm. In Cicero, during September, the rain falls for 11.2 days and regularly aggregates up to 1.14" (29mm) of precipitation.
• Bloomington - September »
  In Bloomington during September, the rain falls for 12.2 days and regularly aggregates up to 1.5" (38mm) of precipitation. On the first day of September in Bloomington, Illinois, sunrise is at 6:23 am and sunset at 7:28 pm.