From the Guardian - Democratic nominee ‘feeling much better’ after leaving Ground Zero site.
"Hillary Clinton left the 9/11 memorial ceremony in downtown Manhattan early on Sunday because she “felt overheated”, a campaign spokesperson said.
“Secretary Clinton attended the September 11th Commemoration Ceremony for just an hour and 30 minutes this morning to pay her respects and greet some of the families of the fallen,” spokesman Nick Merrill said in a statement, later versions of which omitted the word “just”.
“During the ceremony, she felt overheated so departed to go to her daughter’s apartment, and is feeling much better.”
The temperature in New York City on Sunday morning was in the low 80sF, around 28C, with humidity of around 46%. Clinton, like most official attendees at the memorial ceremonies, including the Republican nominee Donald Trump, wore a formal suit."