Yeah, I’m sure he’ll be fine.
We are in Western Australia, Football is a summer sport here as our seasons are opposite to the northern hemisphere. We spend Christmas morning at the beach and the holiday parties are mostly BBQ’s and pool parties. We’ve even had to cancel games in the past due to dangerously high temperatures. Playing in the snow or minus temps will take some getting used to, but his love for the game is such that if he ends up somewhere really cold, he’ll deal with it.
On the flip side, we fly out in a couple of weeks and have already bought heated stadium seats for his games, in SoCal!! 
Yeah, H and I are lightweights 