August in Enniskillen is the rainiest month of the year. In August, the weather in Enniskillen is typically warm. Average daily high temperature in August is about 17 degrees above zero. On average, Enniskillen has 19 rainy, 6 partly cloudy, 4 cloudy, and 2 sunny days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Enniskillen.