August in Portage Park averages a daily high of 28.1°C with nights around 18°C. Expect roughly 9.2 wet days totalling 103mm. Comfortable conditions for being outdoors all day.
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 August data.