Can I monitor my phones temperature?
You can use TempMonitor available from Google Play Store:

System temperature reading in your status bar updating at your choice interval.
TempMonitor is the oldest CPU Temperature monitoring app on the android market. This app is built to do one thing: Temperature, and it does it well.


Some features that you might like:
The temperature can be displayed on the status bar or in the APP Screen. You can also select what you want to see:


Choose from Celsius or Fahrenheit.
Choose what temperature to display (Battery, CPU).
Choose the update interval.