Well yes but really you just have to deal with it. There will be plenty of riders who don't like the extreme heat either but very rarely are stages cancelled or shortened for being to hot. I've seen plenty of pros in Majorca in leg warmers when it's been sunny and around 20 degrees when I was thinking it was a beautiful warm summer's day!That depends on where you live. Valverde has said anything under 20 degree is cold (and I happen to agree with him). However he lives in the south east of Spain (a desert). On the other hand he loves racing when the temperatures are in the upper 20's to mid 30's and is ok with temps in the high 30's. Many riders from northern Europe have issues with that kind of heat. So what someone considers hot or cold just depends on where you happen to live.
Conversely dont tell me any Belgian team thinks a wet 12 degree day is too cold to do 250km in!