October Weather in Chicago Illinois, United State

By: Seat Earnings

Daily high temperatures decrease by 12°F, from 68°F to 56°F, rarely falling below 44°F or exceeding 79°F. Daily low temperatures decrease by 11°F, from 55°F to 45°F, rarely falling below 35°F or exceeding 64°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. 

The month of October in Chicago experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 36% to 46%


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Chicago, the chance of a wet day over the course of October is essentially constant, remaining around 26% throughout. 


The average sliding 31-day rainfall during October in Chicago is essentially constant, remaining about 2.7 inches throughout, and rarely exceeding 4.9 inches or falling below 0.9 inches 


The chance that a given day will be muggy in Chicago is decreasing during October, falling from 5% to 0% over the course of the month. For reference, on July 27, the muggiest day of the year, there are muggy conditions 50% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.


The average hourly wind speed in Chicago is increasing during October, increasing from 11.4 miles per hour to 13.0 miles per hour over the course of the month. 


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