August in Somerset West is the rainiest month of the year. In August, the weather in Somerset West is typically warm. Average daily high temperature in August is about 15 degrees above zero. On average, Somerset West has 17 sunny, 9 rainy, 4 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as June and September is considered the most uncomfortable time to visit Somerset West.