May in Lisburn averages a daily high of 14.9°C with nights around 6.3°C. Expect roughly 15.4 wet days totalling 62.9mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Lisburn is June–September.
Based on HILLSBOROUGH, UK (8.3km), 1995–2024. 21 years of May data.