The period from June to October (also known as the “dry” season) is perfect for watching the Great Migration. Furthermore, this season is also excellent for safaris since the density of animals is the highest near the rivers and other sources of water. The number of mosquitoes is much lower than the usual one, and the weather is mostly sunny. The number of tourist vehicles in the parks is reasonable, though Ngorongoro and Seronera plains in Serengeti are usually the hotspots. Make sure to take warm clothes for the early mornings in June-August, when the temperatures may be low.
The “wet” season (or the “rainy” season) from November to May is ideal for those, who are eager to watch hunting scenes. Calves are born from January to February, and the predators are notably active during this time. The migration of birds is also at its peak at this time of the year, turning the National Parks into a paradise for ornithologists.
Furthermore, the vegetation is booming during the rainy season, and the Parks are amazingly green. Many award-winning photos of the Tanzanian wildlife have shot during May-November. This time is ideal for nature photographers.
A remarkable feature of the wet season is that the number of visitors to the Parks is notably lower than during the dry one. Coupled with the fact that rains are often (though not always, especially from March to May) short dribbles in the second half of a day, the advantages of rainy season should be surely taken into consideration in planning a trip to Tanzania.