October in Portage Park averages a daily high of 17.2°C with nights around 7.2°C. Expect roughly 10.9 wet days totalling 84.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Portage Park is August–September.
Based on CHICAGO OHARE INTERNATIONAL AIRPORT, IL US (13.8km), 1995–2024. 30 years of October data.