July in Peoria averages a daily high of 29.9°C with nights around 19.1°C. Expect roughly 8.5 wet days totalling 84.2mm. Generally workable, with some weather to plan around.
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 July data.