Historical weather data, all-time temperature records, and monthly climate averages for Cary, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Cary runs the full gamut — the mercury has swung from a bitter 18° in 1995 to a shirt-sleeve 76° in 1999, all on the same calendar date. Expect a typical spring day around 55° for a high and 34° for a low, with nearly a coin-flip chance (45%) of some rain joining you.
Cary, IL is no stranger to extremes — the thermometer has touched both 101° in July 1995 and a jaw-dropping -32° in January 2019, a swing of 133 degrees across the same zip code. A single July day in 1985 dumped 4.77 inches of rain, and a February 2011 snowstorm buried the area under 17.3 inches in one shot.
Summer is the main event in Cary, with the week of July 16–22 averaging a steamy 84° high and late June into early July being the wettest stretch of the year. If you're cold-averse, January is brutal — highs average just 29° during the coldest week of the year. Spring and fall offer the sweet spot, with April climbing to 58° and October holding at a comfortable 62°.