October weather forecast
Illinois, USA

October in Illinois is a celebration of autumn, with temperatures continuing their downward trajectory and the state's foliage reaching its peak vibrancy. In the northern territories close to Wisconsin, daytime temperatures often linger in the upper 50s°F to mid-60s°F. Meanwhile, the southern parts, adjacent to Kentucky, display a bit more warmth, fluctuating between the mid to upper 60s°F.

Chicago, with its architectural grandeur, becomes a visual feast as the trees, set against the backdrop of towering skyscrapers, burst into a riot of reds, yellows, and oranges. The influence of Lake Michigan is felt more keenly as the cold breezes set in, hinting at the winter to come. Outdoor events and activities in the city take on a festive aura, with pumpkin patches and harvest festivals setting the tone.

Night temperatures in October are notably cooler, often resting in the mid to upper 40s°F range. These chilly nights, accompanied by shorter days, are harbingers of the winter looming on the horizon.

When juxtaposed with September, October's transition into deeper autumn is unmistakable. The frequency of rainfall diminishes, but when it occurs, it often takes the form of drizzles or light showers. By the time October draws to a close, the state braces for the colder embrace of November and the impending winter chill.

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• Chicago - October »
  In Chicago, snow does not fall in June through October. In Chicago, snow does not fall in June through October.
• Aurora - October »
  On the first day of October in Aurora sunrise is at 6:50 am and sunset at 6:35 pm. In Aurora, during October, the rain falls for 9.2 days and regularly aggregates up to 0.98" (25mm) of precipitation.
• Rockford - October »
  April and October, with an average relative humidity of 75%, are the least humid months in Rockford, Illinois. The months with the lowest humidity in Rockford are April and October, with an average relative humidity of 75%.
• Joliet - October »
  On the first day of October in Joliet sunrise is at 6:49 am and sunset at 6:34 pm. In Joliet, Illinois, snow does not fall in May through October.
• Naperville - October »
  October is the least humid month in Naperville, with an average relative humidity of 73%. With an average relative humidity of 73%, October is the least humid month in Naperville.
• Springfield - October »
  In Springfield during October, the rain falls for 10.3 days and regularly aggregates up to 2.01" (51mm) of precipitation. With an average relative humidity of 70%, October is the least humid month in Springfield, Illinois.
• Peoria - October »
  On the first day of October in Peoria sunrise is at 6:54 am and sunset at 6:41 pm. In Peoria, in October, during 10.3 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.
• Elgin - October »
  In Elgin in October, it is raining for 13.3 days, with typically 2.01" (51mm) of accumulated precipitation. In Elgin in October, it is raining for 13.3 days, with typically 2.01" (51mm) of accumulated precipitation.
• Waukegan - October »
  In October, in Waukegan the rain falls for 12.9 days. October is the first month it typically snows in Waukegan, Illinois.
• Champaign - October »
  In Champaign, Illinois, in October, during 10.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Champaign in October, during 10.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.
• Cicero - October »
  October is the least humid month in Cicero with an average relative humidity of 72%. On the first day of October in Cicero, Illinois, sunrise is at 6:47 am and sunset at 6:33 pm.
• Bloomington - October »
  The least humid month in Bloomington is October, with an average relative humidity of 71%. In October, in Bloomington, Illinois, the rain falls for 10.8 days.