April in Somerville averages a daily high of 13.7°C with nights around 5°C. Expect roughly 11.6 wet days totalling 90.9mm. 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 April data.