Cartagena, Spain's climate is characterized by mild winters and warm summers. During the winter months (December to February), temperatures range from around 2-27°C, with average highs in the mid-teens. Spring brings gradual warming, with April being particularly pleasant, averaging 16°C. Summer is hot and dry, with July and August often reaching scorching highs above 40°C, while autumn sees a cooling trend, returning to mild temperatures by October.