May in Basseterre is the cloudiest month of the year. In May, the weather in Basseterre is typically warm. Average daily high temperature in May is about 27 degrees above zero. On average, Basseterre has 13 rainy, 9 sunny, 8 partly cloudy, and 1 cloudy day in May. The rains are usually moderate. May as well as September, October, and November is considered the most uncomfortable time to visit Basseterre.