September in Haverhill averages a daily high of 23.6°C with nights around 11.1°C. Expect roughly 9.1 wet days totalling 96mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Haverhill is May–June.
Based on HAVERHILL, MA US (2.3km), 1995–2024. 27 years of September data.