Answer

Today in Mumbai is Sunday, September 13, 2026.

Sorry, I can only provide information that is clearly established within Jain tradition. I do not have a verified Jain Panchang/Tithi source available here to accurately state today’s Jain teethi for Mumbai.

Suggestion

Please check a trusted local Jain Panchang, your Jain derasar notice board, or your local Jain sangh’s daily calendar for the exact teethi, because teethi can depend on sunrise timing and local Panchang calculation.