Monsoons (June to September) receives heavy rainfall. Most probaly during June to August you can expect rain. Some times while monsoon on its peak, the area experiences unexpected landslides, tourists are advised to avoid visiting during the monsoon months.
March to May is hot but is ideal for spotting animals and exploring wildlife of the place.
If you prefer maximum sightseeing, it is better to avoid visiting in monsoon months as the rains may hinder you from carrying out tourist activities.
October to February months are pleasing and soothing which makes it perfect for sightseeing, enjoying lush greenery and spotting migratory birds.