Historical weather data, all-time temperature records, and monthly climate averages for West Chicago, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in West Chicago runs mild but unpredictable — the average high is 55° with a low of 33°, but the date has swung from a warm 76° back in 2005 to a bitter 20° low in 2016. There's a 39% chance of rain today, so keep a jacket handy, though snow is essentially off the table.
West Chicago earns its Midwest reputation the hard way: the thermometer has hit 100° (July 2005) and cratered to -29° (January 2019), a jaw-dropping 129-degree spread. The wettest single day on record dumped 6.02 inches on September 13, 2008.
Summer is the sweet spot, with highs peaking around 84–85° in mid-July, while January is brutally cold with average highs barely scraping 28–31°. May is the wettest stretch of the year, averaging 1.35 inches in its rainiest week, so plan outdoor events accordingly.