May in Sint-Niklaas averages a daily high of 18.4°C with nights around 8.4°C. Expect roughly 12.5 wet days totalling 58mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sint-Niklaas is May–September.
Based on WESTDORPE, NL (20.8km), 1995–2024. 30 years of May data.