Historical weather data, all-time temperature records, and monthly climate averages for Chicago Loop, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Chicago sits right in that awkward shoulder season — the average high is just 45° with a low of 34°, but the date has swung wildly from 73° in 2021 to a bitter 20° back in 1970. There's a coin-flip chance of rain (52%), and a 9% shot of snow isn't off the table.
Chicago doesn't mess around at the extremes — the Loop has hit 99° in June 2022 and plunged to -26° in the infamous January 2019 polar vortex. A single July day in 2023 dropped 5.42 inches of rain, and December 2006 buried the city under 9.6 inches of snow in one shot.
Summer is the sweet spot, with highs peaking around 79-80° in mid-July before gradually tapering through fall. If you're cold-averse, avoid mid-January when average highs scrape just 27°. May is the rainiest stretch of the year, averaging over an inch in a single week.