August in Weymouth averages a daily high of 27.6°C with nights around 16.9°C. Expect roughly 9.4 wet days totalling 93mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Weymouth is May–September.
Based on HINGHAM, MA US (2.3km), 1995–2024. 30 years of August data.