Historical weather data, all-time temperature records, and monthly climate averages for Plainfield, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Plainfield sits right in that unpredictable stretch of early spring — historically, highs average 56° but have swung anywhere from a bitter 19° low back in 2018 to a gorgeous 77° in 2005. There's about a 1-in-3 chance of rain today, with a lingering 7% shot at snow that's very much on-brand for northern Illinois this time of year.
Plainfield has seen the full extremes of the Midwest's punishing climate, from a scorching 102° on July 24, 2005, to a brutal -24° on January 16, 2009 — a 126-degree swing that says everything about living in the Chicago exurbs. Summer storms pack a punch too, with the single wettest day on record dumping 4.9 inches on July 27, 2003.
Summer is the clear sweet spot, with the warmest week of the year (July 16–22) averaging a high of 85° — though May through September all offer comfortable conditions for being outside. If you're avoiding the cold, steer clear of mid-January, when highs barely crack 29°. Spring is the wettest season, peaking the week of May 7–13 with nearly 1.5 inches of precipitation on average.