According to the late analog guru, Robert Peese, (he calls this the 5 second rule) if you can hold your finger on a hot device for 5 seconds the case temperature is about 85 deg C. Hotter than that, or too hot to touch, dot your finger with saliva and touch the device for a fraction of a second. If the moisture dries quickly, it's probably about 100 deg C. If it sizzles instantly, the temp may be as hot as 140 deg C.
I just wanted to slip that in here. Maybe help to determine if really too hot. Rest in peace, Mr. Peese.