May in Nashua averages a daily high of 21.1°C with nights around 7.7°C. Expect roughly 12 wet days totalling 101mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Nashua is May–June.
Based on NASHUA 2 NNW, NH US (2.9km), 1995–2024. 26 years of May data.