May in Sunderland averages a daily high of 15.7°C with nights around 6.7°C. Expect roughly 12.9 wet days totalling 46.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sunderland is June–September.
Based on DURHAM, UK (20km), 1995–2024. 27 years of May data.