April is the rainiest month of the year in Tanzania and marks the beginning of the wet season. However, you shouldn’t picture April as a monochrome, dreary month of endless rainfall – most of the rain comes from early afternoon thunderstorms that dissipate relatively quickly.
Outside of the thunderstorms, you can expect relatively warm daytime temperatures ranging from 16°C to 28°C (and up to 30°C on the islands). While only half of the days in April can expect rain, you should be careful when travelling during the rainy season. Roads, particularly dirt ones, can become muddy and difficult to pass through.