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. Clothing appropriate to temperatures below zero is required on the higher slopes of Kilimanjaro and Meru. Also note that it can get very cold at night on the Ngorongoro Crater and early morning game drives may be chilly before the sun comes up.