September in Amherst averages a daily high of 22.8°C with nights around 12.9°C. Expect roughly 10.9 wet days totalling 102.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Amherst is May–September.
Based on BUFFALO NIAGARA INTERNATIONAL AIRPOR, NY US (6.1km), 1995–2024. 30 years of September data.