May in Machakos is the rainiest and the cloudiest month of the year. In May, the weather in Machakos is typically warm. Average daily high temperature in May is about 21 degrees above zero. On average, Machakos has 30 rainy and 1 cloudy day in May. The rains are usually heavy. May as well as March, April, June, and August is considered the most uncomfortable time to visit Machakos.