The best time to go to Mongolia is between May and October, so as to avoid the bitter cold. However, avoid high summer if you're heading to the Gobi Desert, which gets scorching hot. It tends to rain between July and September but it doesn't downpour. Be warned that during the Nadaam in July and August, flights and hotels are quickly booked up, so reserve in advance!
I personally love the lakes and rough terrain and stopping by the river banks to admire the flow of crystal clear water. Having a view up on the mountains with the valleys below was awesome.
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Mongolia camper
5
This was a fantastic trip. Having the variety in landscape (from steppe with nomads to remote forest/valleys) was a treat; visiting with nomads (at the family we stayed with, the gers we stopped by on the way, and with the horsemen the entire time) was also a highlight. What a marvelous and beautiful place!