August in Kilkenny is the cloudiest month of the year. In August, the weather in Kilkenny is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Kilkenny has 23 rainy, 6 cloudy, and 2 sunny days in August. The rains are usually moderate. August as well as January, February, March, and April is considered the most uncomfortable time to visit Kilkenny.