I ran up there once in 115 degrees without any problems and we rented a garage this time so at least we won't be climbing into an already hot car.
A friend of mine is bringing his brand new orange 911 997 GT3 RS, so I'm looking forward to a jaunt in that. I'll keep myself out of the sun as much as possible and well hydrated and it will all be good. Its such a great track, for me its more than worth the discomfort

G.