August in Dera Ismail Khan is the cloudiest month of the year. In August, the weather in Dera Ismail Khan is typically hot. Average daily high temperature in August is about 36 degrees above zero. On average, Dera Ismail Khan has 16 rainy, 13 sunny, and 2 partly cloudy days in August. The rains are usually heavy. August as well as June and July is considered the most uncomfortable time to visit Dera Ismail Khan.