August in Poughkeepsie is the sunniest month of the year. In August, the weather in Poughkeepsie is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Poughkeepsie has 18 sunny, 7 rainy, and 6 partly cloudy days in August. The rains are usually moderate. August as well as September is considered the most comfortable time to visit Poughkeepsie.