August in Nashua averages a daily high of 28°C with nights around 15.1°C. Expect roughly 9.9 wet days totalling 99.8mm. 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. 28 years of August data.