It is a very good choice of place but I will suggest you to avoid it in monsoon season due to chances of landslides specially after mid august till october. April to June (or mid july if weather is good) is the best time to visit.
Dear Fellow Traveler,
You can visit Tungnath in the last week of August but it not the best time to visit. Although temple is open this time but during this period the area around Chopta and Tungnath experience heavy rainfall and thunderstorm regularly. During monsoon, this place becomes prone to landslides, which led to the road blocks and the trekking route also becomes slippery. So I recommend you to avoid your trip during this time period.
You can plan your visit to Tungnath in the first week of October because after the rain wash over the hills, it leaves a crystal blue sky and a lovely fresh air. Tungnath comes more alive looking quite magical and more sparkling than ever before. This time is good for trekking and to enjoy the rich flora-fauna and the serene beauty around Tungnath. But if you still want to go Tungnath in the last week of August than I advise you, before planing your trip, see the weather prediction of next 7-10 days. Carry rain coat and light woolen clothes with good trekking shoes.
Hi Dheeraj, Tungath is pleasant in August. Attached below with my comments you can see few packages offered by Tripoto for hassle free travelling. Please take a look, fill the form and someone will get in touch with you. Thanks!