February in Nantucket is the windiest and the coldest month of the year. In February, the weather in Nantucket is typically cold. Average daily high temperature in February is about 3 degrees above zero. On average, Nantucket has 11 rainy, 8 sunny, 5 cloudy, and 5 partly cloudy days in February. The rains are usually heavy. February as well as January, March, and December is considered the most uncomfortable time to visit Nantucket.