October in Peoria averages a daily high of 18.5°C with nights around 7.1°C. Expect roughly 9.6 wet days totalling 82.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Peoria is September.
Based on GENERAL WAYNE A. DOWNING INTERNATIONAL AIRPORT, IL US (8.5km), 1995–2024. 30 years of October data.