Winters in Sint-Niklaas are cool and unpredictable, with temperatures often dropping below freezing, but also experiencing mild days around 13°C. Spring brings steady warming, with March and April temperatures gradually increasing towards the mid-teens, while May's warmer days can reach up to 26°C. Summers are pleasant, with July and August averaging around 18-19°C, though occasional heatwaves can push temperatures above 30°C. Autumn is a gentle descent into winter, with mild days in September and October giving way to cooler temperatures by November.