August in Weymouth averages a daily high of 20.8°C with nights around 14°C. Expect roughly 11 wet days totalling 55.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Weymouth is June–September.
Based on SWANAGE, UK (35.4km), 1995–2024. 29 years of August data.