May in Ostend averages a daily high of 16.9°C with nights around 10.3°C. Expect roughly 12.3 wet days totalling 49.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ostend is June–September.
Based on WEST SOUBURG, NL (53.5km), 1995–2024. 30 years of May data.