August in Nairobi is the coldest month of the year. In August, the weather in Nairobi is typically warm. Average daily high temperature in August is about 20 degrees above zero. On average, Nairobi has 25 rainy, 5 cloudy, and 1 sunny day in August. The rains are usually moderate. August as well as April, May, June, and July is considered the most uncomfortable time to visit Nairobi.