I had the same problem with mine. It never caused me a failed print, but I didn't want to take a chance. I'm not sure what a safe temperature is, but it was effing hot. I just printed a fan bracket (
Bracket on thingiverse and bought a fan. They had 40mm fans at my local tinkering shop for 47 cents! Couldn't pass it up. Ever since, it has stayed cool to the touch.