Zanzibar City in June

June through October brings the coolest temperatures and least rain. The southeast trade winds keep things bearable, and you'll actually want to explore Stone Town during midday. Hotel rates peak during this dry season, especially July and August when European families arrive. December through February works well too — it's hot but not unbearable, and the short rains usually come as quick afternoon showers. January offers the best balance of decent weather and lower prices. You might catch some rain, but it rarely lasts more than an hour. Avoid March through May unless you love humidity and daily downpours. The long rains can wash out roads to the northern beaches, and many restaurants in Stone Town reduce their hours. But if you don't mind getting soaked, accommodation costs drop by 40% and you'll have popular spots mostly to yourself.