September in Irondequoit averages a daily high of 23°C with nights around 12°C. Expect roughly 10.8 wet days totalling 79mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Irondequoit is May–September.
Based on FREDERICK DOUGLASS GREATER ROCHESTER INTERNATIONAL AIRPORT, NY US (13.2km), 1995–2024. 30 years of September data.