May in Dublin averages a daily high of 16.1°C with nights around 7.2°C. Expect roughly 14.5 wet days totalling 57.2mm. Generally workable, with some weather to plan around.
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 May data.