Winters in Merignac are mild, with temperatures ranging from around 0°C to 16°C, allowing for some warmer days amidst the chill. Spring brings a steady warming trend, with March and April averaging around 11-13°C, marking a gentle transition into summer. Summers are warm and sunny, with July and August often reaching highs of up to 34°C, while autumn sees a gradual cooling, with September still quite pleasant at around 20°C before dropping to more seasonal temperatures in November and December.