The best time to visit Spiti Valley for pleasant weather is during the summer months of March to June. The weather is mild and sunny during this time, with average temperatures ranging from 10 to 20 degrees Celsius. This makes it ideal for outdoor activities such as trekking, camping, and sightseeing.
The monsoon season in Spiti Valley lasts from July to September, and the weather can be unpredictable during this time. There is a risk of landslides and road closures, so it is best to avoid visiting during this period.