Historical weather data, all-time temperature records, and monthly climate averages for Buffalo Grove, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Buffalo Grove tends to land squarely in that uncertain stretch of early spring, with an average high of 54° and a low of 35°. The date has a 55-degree swing in its history — from a bitter 21° in 2002 to a shirt-sleeve 76° in 2005 — so don't put away the layers just yet.
Buffalo Grove has seen the full extremes of Midwest weather, from a brutal -21° during the January 2019 polar vortex to a scorching 104° in July 2012. A single June day in 2013 dropped 4.53 inches of rain, a reminder that this area doesn't do anything halfway.
Summers are the clear highlight, with highs peaking around 84-85° in mid-July and comfortable 80° days through June. Winters are cold and flat-out cold — January and February highs hover in the low-to-mid 30s. If you're chasing rain, late June through early July is the wettest stretch of the year.