Tanzania has roughly two distinct climatic zones:
The interior, with the high plateaus (over 1500 m), undergoing a temperate tropical climate;
The coast, with a humid equatorial climate.
As you go up, the temperature decreases. The further you go (towards the Indian Ocean)
The dry season: May to October. Then the warmer months go from December to February. Sun, blue sky, dried landscapes, thirsty animals.
The rainy season: the “major rainy season” extends from mid-March to early May, but most of the rains are concentrated in April (although relative to the size of the country). Evenings can be cool, even cold. On the periphery of the Ngorongoro crater, it can get really chilly at night, and the thermometer can then drop below 10 ° C.
The “short rainy season” lasts from early November to mid-December. During this period, it does not rain all day, only at certain hours, and it is not unpleasant: animals are more numerous and visitors are rarer. The photographers appreciate the wet periods, because of the exceptional luminosity. The savannah, immense and yellow, is redoubled by the light after the storm, under gray coal-colored skies.
Regions and their climatic particularities
The large parks of the North: hot climate of altitude. Heat important but never stuffy. The Serengeti, Tarangire and Manyara parks are at an average altitude of 1 500 m. In Arusha: temperatures in January fluctuate from 14 ° C (night) to 28 ° C (daytime). January, February and March are the hottest months of the year. April is the rainiest month (350 mm), and August the driest month (7 mm).
Mount Kilimanjaro: snowfall at night in January and February. Frosty nights in July-August.
Dar es Salaam and the eastern coast: equatorial climate with high humidity in the air. It is hot and stifling all year round. The warmest months in Dar es Salaam are December, January, February and March (average daily temperature: 27 ° C). On the coast in general, it rains in November and December, and from early March to early May.
The islands of Zanzibar, Pemba, Mafia: equatorial climate, with the same temperatures and the same rainfall as in Dar es Salaam and on the coast. It is very hot and the air is saturated with humidity, except when the trade winds of the Indian Ocean blow from June to September.