May in Peoria averages a daily high of 23.2°C with nights around 11.6°C. Expect roughly 12.6 wet days totalling 121.4mm. 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 May data.