Job interview on Thursday - help please!

[MillicentFaucet]

My DS has an interview/activity day for a grad job this Thursday (yay)
Unfortunately it's going to be 39° and he's travelling 2 hours by train to get there (boo)
He was planning on suit + button down shirt with no tie. He's going to be a rumpled, sweaty mess when he arrives isn't he?
Any MN suggestions to help him stay looking vaguely professional would be welcome, or should he just expect everyone else to be in the same boat and not worry too much.

Travel in cool clothing and change near to the location just before the interview…or hotel the night before nearby so as to arrive with no stress and nice and fresh?

Unfortunately he's working the night before, I've suggested changing to an earlier train when it's a bit cooler, take his smart togs & change in the train loo but he thinks he'll look daft rocking up to interview with a suit carrier over his arm. Surely they'll let him stash it somewhere in the office?

Is there a gym nearby that does day membership? He could shower and change there, stash the suit bag in a small holdal?