June in Waltham averages a daily high of 25.6°C with nights around 13.1°C. Expect roughly 13.3 wet days totalling 102.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Waltham is May–June.
Based on BEDFORD HANSCOM FIELD, MA US (11.3km), 1995–2024. 26 years of June data.