October in Berwyn averages a daily high of 17.6°C with nights around 8.4°C. Expect roughly 11.4 wet days totalling 89.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Berwyn is May–June.
Based on CHICAGO MIDWAY AIRPORT, IL US (8km), 1995–2024. 28 years of October data.