I always thought that to read temperature sensors on a Linux machine, you had to reach for a package like sensors. You don't.

Like lots of things in Linux, the standard temperature sensor values are exposed as virtual files:

cat /sys/class/thermal/thermal_zone*/temp

27800
20000
88000
88000

That will give you the raw sensor value in milli°C, so divide by 1,000 to get °C. You can get the name of each sensor too.

cat /sys/class/thermal/thermal_zone*/type

acpitz
INT3400 Thermal
TCPU
x86_pkg_temp