September in Elgin averages a daily high of 24.7°C with nights around 11.8°C. Expect roughly 8.6 wet days totalling 87.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Elgin is August–September.
Based on ELGIN WATER, IL US (2.9km), 1995–2024. 30 years of September data.