In May, the weather in Enniskillen is typically warm. Average daily high temperature in May is about 14 degrees above zero. On average, Enniskillen has 16 rainy, 9 partly cloudy, 4 cloudy, and 2 sunny days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Enniskillen.