August in Plymouth averages a daily high of 20.5°C with nights around 13.4°C. Expect roughly 13.6 wet days totalling 76.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Plymouth is June–September.
Based on PLYMOUTH MOUNTBATTEN, UK (2.5km), 1995–2024. 29 years of August data.