May in Waterford averages a daily high of 16.5°C with nights around 8.3°C. Expect roughly 13.5 wet days totalling 66.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Waterford is June–September.
Based on WATERFORD TYCOR, EI (1.4km), 1995–2024. 22 years of May data.