Get you a really small (Igloo, etc.) ice chest and store it in there instead of the glove compartment, it'll be fine no matter what.
If someone sees it in your car, they won't bother to steal your lunch, so that'd be safe. 
Do like my wife, have a small towel or blanket to cover stuff with, that works to for hiding stuff.
Randy
drmac wrote in post #5808420
Ok, I got caught again without a camera and missed a great sunset. I was wondering how much potential damage would I cause a Canon PowerShot if I kept it in the glove compartment of my car. During the summer, temperatures top the upper 90's. It would be out of direct sunlight, but I am concerned about the heat...