Historical weather data, all-time temperature records, and monthly climate averages for Granite City, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Granite City typically lands squarely in mild spring territory, with an average high of 62° and low of 42°. The date has seen a wide swing historically though — from a balmy 84° in 2023 down to a bitter 28° back in 2002. There's about a 1-in-3 chance of rain today, so keep an umbrella handy.
Granite City earns its Midwest stripes with some serious weather extremes — a scorching 107° in June 2012 on one end and a brutal -14° in January 2014 on the other, a 121-degree spread. A single July day in 2022 dumped 7.23 inches of rain, and New Year's Day 2015 buried the city under 9 inches of snow.
Summer is the headline here — highs reach the low 90s from mid-July through August, making it genuinely hot for weeks at a stretch. If you're cold-averse, avoid January and February when highs barely crack the mid-40s. Late June through early July is the wettest stretch of the year, averaging over an inch and a half of rain in a single week.