December in Dublin averages a daily high of 9°C with nights around 2.9°C. Expect roughly 17.6 wet days totalling 73.7mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Dublin is June–September.
Based on DUBLIN PHOENIX PARK, EI (5.8km), 1995–2024. 25 years of December data.