July in Lisburn averages a daily high of 18.7°C with nights around 10.9°C. Expect roughly 17.4 wet days totalling 76.8mm. 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. 21 years of July data.