Your cooler is possible damaged, not seated correctly, or perhaps even the thermal paste has gone off between the CPU Cooler and the CPU itself.
Your idle temps should be around 30-35C. You could bring it to a store to diagnose, or try the fixes yourself.
If you try it yourself you will have to replace the thermal paste, reseat the cooler, and make sure the cooler is working as it should. Also worth cleaning any dust out of your case, and specially on the cooler.