Historical weather data, all-time temperature records, and monthly climate averages for Streamwood, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Streamwood sits in that unpredictable shoulder season — expect a high near 55° and a low around 33°, but the record books tell a wilder story. This date has seen everything from a balmy 78° back in 1921 to a brutal 17° in 1982. There's a 39% chance of rain, though snow is nearly off the table at just 3%.
Streamwood's weather has real teeth — the all-time high of 103° in July 1910 and the all-time low of -27° in January 1985 represent a 130-degree swing in possible conditions. The wettest single day on record dropped a staggering 6.47 inches on July 24, 2010, while a January 1966 snowstorm buried the area under 16.5 inches in a single day.
Summer is peak season here, with highs averaging 84–85° in mid-July, while January bottoms out with average highs of just 28–29°. If you're visiting, June brings the heaviest rain, averaging over an inch in a single week. For the best weather, aim for late summer — August holds onto the warmth at 82° while the worst of the summer storms start to ease.