From SFMTA:

More Muni Service Coming in August

The SFMTA is updating and expanding our next big service change targeted for August 14. These adjustments take into account stakeholder feedback and changes in COVID-19 regulations like physical distancing and our ability to switch operators in the field rather than having to return vehicles to their yards first for cleaning. Enhancements to our previously announced plan include expanding evening service and restoring Muni Owl All-nighter service, adding back four more routes and restoring or adjusting segments on several others.