That is too hot.
I worked on a chemical clean-up site in 2004, during the too-hot summer. I was one of the luckier ones on-site, as I could go and sit in an air-conditioned office and 'maintain' the computers.

The folk who were actually doing the digging for chemicals weren't so fortunate; they were wearing paper particulate-protection suits covered in rubber chemical-proof outfits, into which they were sealed in an air-tight manner with gaffer tape and fed air from a hose thirty feet away. The machine pumping air to them was run on diesel, and had a lovely warming effect on their circulated air. This was, apparently, pleasant enough in winter, when the freezing mud was up to the knee and the torrential rain hammered on their visors. In thirty-two degree blazing sunshine, however, it's not so nice.

One of them placed a thermometer next to their skin for curiosity's sake. They were working (quite hard physical labour, some of it) at about fifty degrees. I'm amazed no-one died, quite frankly.
(ThomsonsPier consumes, Tue 5 May 2009, 15:33, Reply)