I went to start my 03 Boxster yesterday afternoon and nothing happened when I turned the key.  It had been sitting in the sun all day while the temp hit 100 plus.  I tried turning the key 6-7 times and no click, but the radio worked and the instruments came on.  About to call AAA, I open the door and for a last try, turned the key again.  The engine turned over and started as normal.  Could the outside temp be the problem our....?