WHEN TO VISIT
There is no truly bad time to visit Tanzania; the optimum months depend on which parts of the country you plan to visit and your main interests.
Peak tourist season in the north coincides with the European winter, with Jan/Feb being particularly good, since it is when the wildebeest calve. The low season typically runs from mid-April to September, but tourism surges over June and July, when migratory activity peaks in the Serengeti and June. May, though sometimes wet, can be an excellent month to visit, with a good chance of catching the migration in the far south, and relatively few other tourists around.
The coast and offshore islands are best avoided over the high rainfall months of March to May. This hot and humid part of the country is most pleasant during the relatively cool and dry months of Jun-Oct, which is also when the risk of malaria is lowest.