Mazatlán's climate is characterized by mild winters and warm summers, with temperatures gradually increasing as the year progresses. The winter months of January, February, and March are cool, with average highs ranging from 18-19°C, while December is slightly cooler still. Spring brings warmer temperatures, with April and May averaging around 23-25°C. Summer months of June to September are hot, but with a relatively consistent temperature range of 28-35°C, and the humidity remains moderate. Autumn sees temperatures gradually cool down again, returning to more pleasant averages by October and November.