Winters in Sucy-en-Brie are cool and variable, with temperatures often fluctuating between freezing and mild conditions. Spring is a gradual warming period, with March and April being particularly warm, occasionally reaching highs of up to 25°C. Summer days are usually pleasant, with temperatures hovering around 20-22°C, while autumn returns to a more mixed bag, with temperatures sometimes dipping below zero but often staying in the mid-teens.