Winters in Spijkenisse are cool and occasionally cold, with temperatures often dipping below freezing point. Spring brings a gradual warming trend, with temperatures rising steadily by March and April, but still experiencing chilly nights. Summer is mild and pleasant, with warm days and comfortable nights, while autumn sees a return to cooler temperatures, with some frosty mornings. The coldest months are January and December, averaging around 5°C, while the warmer months of June to August average around 17°C.