The average year-round temperature is 78F. During the high tourist season, October to April, the temperature is typically 80F during the day and cools to the 60's at night. In the low season, May to September, the temperature will go up to 100+F during the day and stay in the upper 70's and low 80's in the evening. The average year-round water temperature in the Sea of Cortez is 72F. During the summer months the water temperature can reach the mid 80's. The climate is arid with over 300 days of sunshine, with some reports of over 350 days. Average annual rainfall is 10 inches (25.4cm), most with occurring during the months of September and October.