May in Culebra is the cloudiest month of the year. In May, the weather in Culebra is typically warm. Average daily high temperature in May is about 27 degrees above zero. On average, Culebra has 15 rainy, 9 sunny, 6 partly cloudy, and 1 cloudy day in May. The rains are usually moderate. May as well as June, July, August, and September is considered the most uncomfortable time to visit Culebra.