April in Zanzibar is the rainiest and the cloudiest month of the year. In April, the weather in Zanzibar is typically hot. Average daily high temperature in April is about 28 degrees above zero. On average, Zanzibar has 24 rainy and 6 sunny days in April. The rains are usually heavy. April as well as January, March, and May is considered the most uncomfortable time to visit Zanzibar.