The Inner Niger Delta flooded Savannah eco-region has a hot, dry climate for most of the year. During the dry season, winds from the Sahara can bring hot air with temperatures of more than 40 °C. Rainfall varies, but can be as high as 600 mm a year in the south and as low as 200 mm in the north. Flooding typically begins in the south in August or September and reaches the northern margins of the eco-region in December. The total flooded area can grow to be as large as 30,000 km ². More than 500,000 people live in the Inner Delta of the Niger River, herding millions of sheep and goats and using the floodplains for dry-season grazing.

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