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Get the monthly weather forecast for Chicago, IL, including daily high/low, historical averages, to help you plan ahead.
Weather.com brings you the most accurate monthly weather forecast for Chicago, IL with average/record and high/low temperatures, precipitation and more.
The average temperature in Chicago in October for a typical day ranges from a high of 62°F (17°C) to a low of 48°F (9°C). Some would describe it as moderately chilly and breezy. For comparison, the hottest month in Chicago, July, has days with highs of 81°F (27°C) and lows of 68°F (20°C).
December Weather in Chicago Illinois, United States. Daily high temperatures decrease by 8°F, from 42°F to 34°F, rarely falling below 20°F or exceeding 55°F. Daily low temperatures decrease by 8°F, from 32°F to 24°F, rarely falling below 7°F or exceeding 43°F.
In early October, particularly mild days, even warm, can occur, but in the course of the month there may be slight frosts. Between late October and early November, usually after the first night frosts, a mild period, with highs above 20 °C (68 °F), can occur: it's the so-called Indian summer.
Aug 12, 2024 · 12 December. October weather forecast for Chicago, Illinois: In Chicago, Illinois, in October, it is raining for 14.2 days, with typically 3.11" (79mm) of accumulated precipitation. In Chicago, snow does not fall in June through October.
Check accurate weather in December in Chicago (IL). Expect Chicago December temperature around 3°C (37°F). Read clothing tips & recommended activities.
