In reply to RCJ: no, just use the normal correct pressure for my weight as stated on the tyres which in my case is 120psi for pro race tyres.
When I was cycling in the outback in Queensland Australia one summer I had my touring tyres up at 80-90psi over their recommended 65psi as I had no gauge on my pump and over did it after a puncture. Temps were in the 40-50 region and they didn't explode. Ride comfort and rolling resistance mat have been a little compromised though.
Cheers
Toby