It was so bad, one commuter told Channel 7: "I'd like to be in a sauna bath, I think that would be a little cooler."
The MTA is preparing for a possible strike as soon as September 18th.
Do you have an opinion on the MTA's various fare increases? You have two chances to sound off.
This week's MTA Hero is Ekow Amuaku, an administrative assistant for the 511 contact center for New York City Transit.
Scaffolding has been installed on the Clark Street station entrance to reinforce the marquee and ensure safety.
The station will not reopen until the investigation is complete and to make sure another marquee is secure.