We took a ride to Death Valley a couple of weeks ago and saw temperatures up to mid 90s. All of us wore the Cayenne Pro jacket/pants combo and we all were pleasantly surprised by the way they vented.
I totally agree with Motodisiac. Start with this combo and see how it works out for you. The vents are really easy to operate even as you are riding your bike.
The Cayenne Pro combo will definitely keep you warm in temperatures as low as lower 50s with just a t-shirt under it.
Just my personal experince, hope that helps ...
Dum spiro spero