Due to its proximity to the equator Tanzania has a tropical climate that is pretty constant throughout the year (ranging from 25°C to 30°C), although early mornings and evenings can be chilly. We would advise against travelling in April and May due to the heavy rains, however June (the green season) is a particularly good time for bird watchers with plenty of migratory species around.
Tanzania’s peak season is between July and October. This is the time to visit if you want to witness the thrill of the Great Migration, which starts in July in the north of the Serengeti. During this period the land dries up, which makes wildlife easier to spot as they are drawn to waterholes. In the high season the northern circuit – which includes the Serengeti and Ngorongoro Crater – can become very busy. Consider one of the lesser known parks such as Ruaha or the Selous Game Reserve for a quieter safari experience.
By October the migration will have moved into Kenya, however wildlife viewing is still great in both the northern circuit and southern parks. Short rains are expected in November and December, however it tends to only rain during the night and migrating herds can be seen travelling south from Kenya.
Both the temperature and humidity rises over the new year, and you’ll find the migration herds in the southeast of the Serengeti for calving season, with wonderful game viewing in the Ndutu Plains. The hot and humid weather continues up until March and the migration starts to leave Ndutu. This is a fantastic opportunity to enjoy low season offers.