August in Lisburn averages a daily high of 18.6°C with nights around 11°C. Expect roughly 16.3 wet days totalling 79.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lisburn is June–September.
Based on HILLSBOROUGH, UK (8.3km), 1995–2024. 22 years of August data.