September in South Bend averages a daily high of 24.3°C with nights around 12.5°C. Expect roughly 9.1 wet days totalling 76.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit South Bend is June–September.
Based on SOUTH BEND AIRPORT, IN US (6.1km), 1995–2024. 30 years of September data.