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It’s easier to understand with this at-home fun activity.Everything you need for a backyard campout this summerNot ready to venture out for a camping trip this year? Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Weather temperatures in Chicago in the month of September is 16. Get the monthly weather forecast for Chicago, IL, including daily high/low, historical averages, to help you plan ahead. Rain Calendar overview of Months Weather Forecast. How sunny is it in Chicago in September? We'll assume you're ok with this, but you can opt-out if you wish. Sunshine The long, hot days of summer are getting shorter in September, with an average of 8 hours of sun per day in September. Aug. Sept. Oct. Nov. Dec. CHICAGO. The minimum temperature usually falls between 52 and 57 °F (11 to 14 °C). ***Coldest to Warmest Official Chicago Temperature Data from 1872-2019***. But opting out of some of these cookies may have an effect on your browsing experience.This website uses cookies to improve your experience. What is the Weather in Chicago in September This post is an overview of the September weather in Chicago, including snow and precipitation forecasts, as well as tips on how to dress and things to do. Daily and nightly averages during September were 23.4 °C and 20.1 °C. Sea water temperature in Chicago in September, °C Ron DeSantis declared a state of emergency for Atlantic coastal counties and urged residents to remain vigilant. The longest day of the month is the 1st with 13 hours and 7 minutes of daylight. One in four years has drier weather, while another one in four is wetter. These durations can vary by a minute or two from year to year.The relative humidity in Chicago during September usually peaks at 85 percent in the morning then drops to 55 percent by mid afternoon.September is less windy than most other months in Chicago.Chicago sees a sharp decline in stormy weather during September compared with the previous month.These weather data are long-term historical averages provided by the By the end of the month, the temperature has dropped around 11 °F (6 °C) below what it was at the start.Nearly every day in September warms to over 60 °F (16 °C) in Chicago. There are normally 8 hours of bright sunshine each day in Chicago in September - that's 61% of daylight hours . Through the month the highs are about 24 and lows being 12 degrees. Today’s and tonight’s Chicago, IL weather forecast, weather conditions and Doppler radar from The Weather Channel and Weather.com Visualize past, present, and future weather from many angles via both static and interactive mapsCurrent and future radar maps for assessing areas of precipitation, type, and intensitySatellite maps for visualizing where there is cloud cover and associated precipitationView live current conditions in and around your areaCurrently active global watches and warnings, lightning, and severe weather riskCoverage of top events from the world’s most trusted name in weatherBreaking news and top weather stories from around the globeListen to behind-the-scenes details on trending weather topicsMeet the talent dedicated to bringing you the most accurate informationVideo coverage of the top weather events people are talking aboutProvides winter weather forecasts and the winter weather outlook for your areaVisit our Corporate Site for more info on AccuWeatherDownload our free award-winning apps for Superior Accuracy™ on the goExplore More, Dive Deeper, Analyze Faster with AccuWeather PremiumSpecialized Weather Centers, More of Everything with AccuWeather ProfessionalLet AccuWeather help you personalize your day-to-day forecasts, to help you better know how to plan your day, and your outdoor activities.Florida braces for impact as Hurricane Isaias bears downFlorida Gov.