August in Koforidua is the rainiest and the cloudiest month of the year. In August, the weather in Koforidua is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Koforidua has 31 rainy days in August. The rains are usually heavy. August as well as March, April, May, and June is considered the most uncomfortable time to visit Koforidua.