The climate is tropical and coastal areas are hot and humid. The rainy season lasts from March to June. The central plateau is dry and arid. The northwestern highlands are cool and temperate and the rainy season here lasts from November to December and February to May.

Tropical clothing is worn throughout the year, but in the cooler season, from June to September, jackets and sweaters may be needed, especially in the evenings.

The United Republic of Tanzania lies on the east coast of Africa and is bordered by Kenya and Uganda to the north; by Burundi, Rwanda and the Democratic Republic of Congo to the west; by the Indian Ocean to the east; and by Zambia, Malawi and Mozambique to the south. The Tanzanian mainland is divided into several clearly defined regions: the coastal plains, which vary in width from 16 to 64km (10 to 39 miles) and have lush, tropical vegetation; the Masai Steppe in the north, 213 to 1067m (698 to 3500ft) above sea level; and a high plateau in the southern area towards Zambia and Lake Nyasa (Lake Malawi). Savannah and bush cover over half the country, and semi-desert accounts for the remaining land area, with the exception of the coastal plains. Over 53,000 sq km (20,463 sq miles) is inland water, mostly lakes formed in the Rift Valley. The United Republic of Tanzania includes the islands of Zanzibar and Pemba, about 45km (28 miles) off the coast to the northeast of the country.