Nain County has a desert climate, and the difference in temperature between night and day is quite obvious in the seasons. The rain of this area is negligible, and the long days of summer are without rain in this region.
The region has no rivers and springs due to its climatic conditions, and there is one small seasonal river which passes about 5 km north of the Khur.
The main part of the Nain County is a desert, which is one of the most beautiful natural attractions in this city. The Rig Jenn is one of the most beautiful desert in this area, which has emerged by great sand dunes.