Winters in La Seyne-sur-Mer are cool and unpredictable, with temperatures varying between -4°C and 19°C. Spring brings gradual warming, with March and April temperatures often reaching the mid-20s, while May is warmer still, averaging around 17°C. Summer months of June to August see a significant temperature increase, with highs frequently above 30°C, but also experiencing occasional cooler days. Autumn returns to more moderate temperatures, similar to those found in winter, with October and November averages dipping below the spring levels. The annual temperature range is marked by mild winters and warm summers, with little distinction between the seasons in terms of overall warmth.