August in Charlotte Amalie is the rainiest and the hottest month of the year. In August, the weather in Charlotte Amalie is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Charlotte Amalie has 22 rainy, 5 partly cloudy, and 4 sunny days in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Charlotte Amalie.