Historical weather data, all-time temperature records, and monthly climate averages for Portage Park, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Portage Park sits squarely in the awkward stretch of Chicago spring — expect a high around 53° and a low near 34°, with a 37% chance of rain. The date has a wild range in the record books, from an 85° scorcher in 1988 down to an 18° freeze in 1975, so pack layers.
Portage Park has seen weather that means business: a brutal -27° in January 1985 on the cold end, and a punishing 104° in June 1988 on the hot end. A single July day in 2011 dumped 6.86 inches of rain, and a January 1999 storm buried the neighborhood under 18.6 inches of snow.
Summer is the sweet spot here — the week of July 16–22 averages a high of 85°, though it's also the wettest stretch of the year. Winters are genuinely cold, with mid-January highs hovering around 29°. Spring and fall offer mild shoulder seasons, with April averaging 59° and October coming in at 63°.