March in Marsh Harbour is the sunniest month of the year. In March, the weather in Marsh Harbour is typically warm. Average daily high temperature in March is about 23 degrees above zero. On average, Marsh Harbour has 22 sunny, 6 partly cloudy, and 3 rainy days in March. The rains are usually light. March as well as February, April, and December is considered the most comfortable time to visit Marsh Harbour.