June in South Boston averages a daily high of 24.6°C with nights around 15.6°C. Expect roughly 11.1 wet days totalling 100.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit South Boston is May–September.
Based on BOSTON LOGAN INTERNATIONAL AIRPORT, MA US (4.5km), 1995–2024. 30 years of June data.