Historical weather data, all-time temperature records, and monthly climate averages for Schaumburg, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Schaumburg sits right on the edge of winter's exit — the average high is just 50° with overnight lows still flirting with freezing at 32°. The date has swung wildly over 58 years of records, from a bitter 13° low in 1982 to a shirt-sleeve 74° high in 2021. There's about a 1-in-3 chance of rain today, but snow is essentially off the table.
Schaumburg's weather has real teeth at both extremes — the mercury has soared to 103° in July 1974 and plunged to a brutal -28° on January 31, 2019, a swing of 131 degrees. Winter can pile on fast: a single February day in 2011 dropped 17 inches of snow, and that same summer a storm dumped 5.72 inches of rain in one day.
Summer is the undisputed sweet spot, with mid-July highs averaging 83° — though that's also when the heaviest rain falls, so pack accordingly. If you're cold-averse, avoid mid-January, when average highs barely clear 27°. Spring and fall offer mild shoulder seasons, with April climbing to 58° and October holding at a comfortable 61°.