What processor do you have, and what cooling?
As mentioned coretemp and speedfan will allow you to monitor your temperatures and both are free programs
Moto
Well if you are using a 2nd or 3rd generation Intel® Core™ processor then your processor will have a build in last chance to save the processor feature called the Thermtrip which is set for 130c. Understand that if the processor gets that hot you can count on something else being damaged but the temperatures.