August in Kingston is the coldest month of the year. In August, the weather in Kingston is typically warm. Average daily high temperature in August is about 18 degrees above zero. On average, Kingston has 11 rainy, 10 sunny, 9 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as February, May, June, and July is considered the most uncomfortable time to visit Kingston.