Zanzibar experiences  pleasant  tropical weather conditions for most of the year which makes it one of  year-round  destinations. 

The temperature rarely drops below 25, but even when it hits the thirties, splendid sea breezes will cool you down. Love sun? Here you can enjoy 12 hours of daylight every day.

The climate in Zanzibar is influenced by the motions of the Indian Ocean monsoons and defined by wet and hot seasons. There are two  official wet seasons:

The long rains (Swahili: Masika ) start in mid-March throughout  the end of May. During this period it rains heavily,  especially  in April but the chances to catch an interval of clear sky  followed by sunshine during a day are still quite high.

Short rainy season (Swahili: Vuli) is in November. Between December  and  March  is the Zanzibari summer, the hot season, when temperature tends to reach 30°C and over. During this time of the year expect heat and high humidity, especially in February, which is the hottest month, with temperatures reaching up to 35°C in shade.

Zanzibar, like other tropical destinations tends to experience  cool season from June throughout  October with temperature averaging 26°C. August is the coolest month of the year with the temperature average dropping to about 24°C . You can clearly see that “cool” here still means weather that is very much welcoming beachwear.