September in Youngstown averages a daily high of 23.5°C with nights around 11.6°C. Expect roughly 9.8 wet days totalling 92.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Youngstown is May–September.
Based on YOUNGSTOWN WARREN REGIONAL AIRPORT, OH US (17.3km), 1995–2024. 30 years of September data.