January in Kempton Park is the rainiest month of the year. In January, the weather in Kempton Park is typically warm. Average daily high temperature in January is about 25 degrees above zero. On average, Kempton Park has 15 rainy, 8 sunny, 7 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as December is considered the most uncomfortable time to visit Kempton Park.