September in Champaign averages a daily high of 26.3°C with nights around 13.3°C. Expect roughly 7.6 wet days totalling 83.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Champaign is September.
Based on CHAMPAIGN 3 S, IL US (3.6km), 1995–2024. 30 years of September data.