Historical weather data, all-time temperature records, and monthly climate averages for Northbrook, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Northbrook is classic shoulder-season unpredictability — highs have swung anywhere from 25° to 76° on this date over the past 29 years. Expect something in the mid-50s today, though there's a 45% chance you'll need an umbrella.
Northbrook earns its Midwest badge honestly: the thermometer has hit both 104° in July 2012 and -21° in January 2019, a jaw-dropping 125-degree spread. A single June day in 2013 dumped 4.53 inches of rain, a reminder that summers here can turn serious fast.
Summer is the main event, with highs peaking around 84-85° in mid-July before tapering off through fall. Winters are genuinely cold — January highs barely crack 32° — so plan outdoor trips for May through September. Late June into early July is the wettest stretch of the year, averaging over an inch of rain per week.