In Jain tradition, “Siddhi” of Varshi Tap means the Parna (completion day) of the Varshi‑tap fast.

According to commonly used Jain Panchang for India, in year 2026:

• Varshi Tap Parna (Siddhi) falls on 19 April 2026 (Sunday).

Exact observance can differ slightly by city (sunrise time) and by sect/tradition, so it is always best to confirm locally with your Jain Sangh or printed Jain Panchang for 2026.