You need to use lm_sensors.
http://www2.lm-sensors.nu/~lm78/docs.html

On Wed, 12 Jun 2002, Robert P. Goldman wrote:

> Any idea how to monitor my CPU temperature?  I just tried using
> gkrellm, and as far as I can tell it's more of a segfault generator
> than anything else :-(
> 
> R
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