December in Lisburn averages a daily high of 8°C with nights around 2°C. Expect roughly 19.6 wet days totalling 89.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Lisburn is June–September.
Based on HILLSBOROUGH, UK (8.3km), 1995–2024. 20 years of December data.