January in Dublin averages a daily high of 8.4°C with nights around 2.2°C. Expect roughly 16.4 wet days totalling 63mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Dublin is June–September.
Based on DUBLIN PHOENIX PARK, EI (5.8km), 1995–2024. 27 years of January data.