Historical weather data, all-time temperature records, and monthly climate averages for Bartlett, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Bartlett runs cool, with an average high of just 52° and lows that can still dip to freezing. The date has seen a 47-degree swing in its history — from a balmy 79° back in 1921 to a brutal 16° in 1995. There's a 38% chance of rain today, though snow is nearly off the table at just 2%.
Bartlett's weather has real teeth at both ends of the thermometer — 103° in July 1910 and -27° in January 1985 is a 130-degree spread over its recorded history. A single day in July 2010 dumped 6.47 inches of rain, and a January 1966 snowstorm buried the area under 16.5 inches in one shot.
Summer is the clear sweet spot, with highs peaking around 84-85° in mid-July and comfortable 80° readings through June. If you're cold-averse, avoid mid-January, when average highs barely crack 28°. Rain is most likely in early-to-mid June, averaging over an inch in a single week.