It's no guarantee of anything, but I live in a climate very similar to Orlando and we've left all kinds of electronics in the car for years with no ill effects. That includes the car stereo, DVD players, LCD screens, Nintendo DSes, a GameCube, several DSLRs, etc. I've never heard of anyone here having electronics fried because of car heat. In fact, I story many of these types of items in my attic, which gets just as hot.
On the other hand, I've had lots of things melt that were left in the car in the sun. That includes chess pieces, crayons (quite attractive all melted together), gummy bears, and candles.