Sestao, Spain's climate is marked by mild winters and warm summers. January is the coldest month with temperatures ranging from -7°C to 20°C, averaging around 8°C. Spring arrives in March, bringing warmer days with temperatures often reaching up to 30°C, while autumn sees a gentle decline in temperature, averaging around 15°C in October. Summers are hot and humid, with July and August temperatures frequently exceeding 37°C, but the mercury dips significantly during the winter months. Overall, Sestao's climate is characterized by moderate temperatures throughout the year, with occasional extreme variations.