May in Amherst averages a daily high of 19.8°C with nights around 9.2°C. Expect roughly 12.5 wet days totalling 82.7mm. Generally workable, with some weather to plan around.
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 May data.