April in Sint-Niklaas averages a daily high of 15°C with nights around 4.9°C. Expect roughly 11.2 wet days totalling 37.2mm. 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 April data.