Winters in Castellammare di Stabia are mild, with temperatures rarely dropping below freezing and averaging around 9-10°C. As spring arrives, temperatures gradually rise, reaching averages of 13-18°C by May. Summer is warm to hot, with July and August often seeing highs above 30°C, but also experiencing some cooler mornings. Autumn brings a return to milder conditions, with September being the warmest month outside of summer, averaging around 23°C. Overall, winters are quite cool and springs are pleasant, while summers can be hot and humid, with autumns offering a welcome respite from the heat.