April in Zanzibar is the rainiest and the cloudiest month of the year. In April, the weather in Zanzibar is typically warm. Average daily high temperature in April is about 27 degrees above zero. On average, Zanzibar has 27 rainy, 1 sunny, 1 cloudy, and 1 partly cloudy day in April. The rains are usually heavy. April as well as March, May, June, and July is considered the most uncomfortable time to visit Zanzibar.