October in Somerville averages a daily high of 17.1°C with nights around 9°C. Expect roughly 10.2 wet days totalling 103.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Somerville is May–September.
Based on BOSTON LOGAN INTERNATIONAL AIRPORT, MA US (8km), 1995–2024. 30 years of October data.