Historical weather data, all-time temperature records, and monthly climate averages for Oak Park, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Oak Park runs cool but unpredictable — the average high sits at 54° with a low near 37°, but this date has swung anywhere from a bitter 27° (2018) to a summery 76° (2021). There's a 43% chance of rain, so keep an umbrella handy, though snow is essentially off the table.
Oak Park has seen the full extremes of the Chicago climate, from a punishing 104° on July 30, 1999 to a dangerous -22° on January 30, 2019 — a swing of 126 degrees across its recorded history. Single-day rainfall hit 5.2 inches on October 14, 2017, and a December 2000 storm buried the area under 14.3 inches of snow.
Summer is the clear sweet spot, with highs peaking around 85–86° in mid-July before a gradual slide into fall. Winter bites hard — January highs average just 30–33°, so plan accordingly if you're visiting between December and February. May is the wettest stretch of the year, averaging over an inch of precipitation in its second week alone.