Match officials are monitoring the conditions before announcing the revised throw-in time.
The first unofficial Test ended in a draw
The two teams are heading into the second and final unofficial Test after the opening match in Galle ended in a draw.
Both sides will be looking to end the series with a win.
Squads:
Sri Lanka U19. Dimantha Mahavithana, Dulnith Sigera, Senuja Wekunagoda, Vimath Dinsara (captain), Kavija Gamage, Chamika Heenatigala, Ramiru Perera, Jason Fernando (wicketkeeper)
India U19 Lakshya Rajesh Raichandani, Sagar Virk, Kushagra Ojha, Yashbardhan Chauhan (captain), Kush Patel, Manav Krishna (wicketkeeper), Kavya Patel, Jeganathan Hemchudeshan, BK Kishore, Priyanshu Singh, Pranav Ragavendra, Rohit Yadav, Aryan Sakpal Chauhan.