yum install lm-sensors

## 'yum' above for CentOS, 'apt-get' if you are using Ubuntu

sensors-detect
sensors

## if sensors-detect does not work, and above lm-sensors command does says 'nothing to do', try below instead

yum install lm_sensors.x86_64

[root@rdlab ~]# sensors
coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +42.0°C  (high = +80.0°C, crit = +90.0°C)
Core 0:         +33.0°C  (high = +80.0°C, crit = +90.0°C)
Core 1:         +35.0°C  (high = +80.0°C, crit = +90.0°C)
Core 2:         +36.0°C  (high = +80.0°C, crit = +90.0°C)
Core 3:         +30.0°C  (high = +80.0°C, crit = +90.0°C)
Core 4:         +33.0°C  (high = +80.0°C, crit = +90.0°C)
Core 5:         +32.0°C  (high = +80.0°C, crit = +90.0°C)

watch -n 1 -d sensors

## continuously prints and highlights changes