September in Erie averages a daily high of 22.9°C with nights around 14.1°C. Expect roughly 9.9 wet days totalling 107.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Erie is May–September.
Based on ERIE INTERNATIONAL AIRPORT, PA US (9.7km), 1995–2024. 30 years of September data.