Snowbird wannabees love vacationing on Grand Bahamas because of the weather. The island’s average high temperature is 83° Fahrenheit. During the peak winter months, it is in the high 70s with a water temperature ranging from 72 to 78°F. The climate is classified as a tropical rainforest. The rainy season peaks in August and September. The lowest precipitation occurs from December through April. In short, all you need to pack is your bathing suit, sunglasses and suntan lotion. Maybe add a sweater if you get chilled at night.