Tanzania self-drive safari. Tanzania has the hottest weather at all times of the year. From July to March is a dry and short rain season. With the short rains in November and December, and the long rains from March to May. Most areas in Tanzania enjoy warm days and cool evenings year-round. While temperatures drop to below freezing on Mount Kilimanjaro and Mount Meru, the country’s Indian Ocean coast and lakeside regions are hot and humid. Tanzania has two distinct rainy seasons, April to May (the ‘long rains’) and November to December (the ‘short rains). The main rainy season (the long rains) produces tropical downpours in the afternoons and the short rain season sees the occasional brief shower.