The climate is commonly referred to as the "equatorial belt climate", with tropical and high temperatures throughout the year.
The climate is basically divided into two dry seasons that alternate with two rainy ones: the Great Rainy Season, between April and June, and the Short Rainy Season, between November and December.
During the dry seasons the temperature often exceeds 30°C, and even during the rainy seasons the thermometer never drops below 22/24°C.
June to September / October are the best months to visit Zanzibar. This is when you’re most likely to get clear blue skies and balmy temperatures.
Mid-December, January and February are also ideal months to visit Zanzibar. These months fall in the short dry season which offers the best weather for sun-worshipers who like hot weather. During these months you’re likely to experience clear skies, little if any rain and high temperatures.