Having just put a headless Raspberry Pi in the attic, the chip temperature is of some interest. Doing this in an SSH session comes in handy:
watch 'echo "scale=1 ; d = $(cat /sys/class/thermal/thermal_zone0/temp) / 1000 ; print d , \" °C\n\" " | bc' # blank line to ensure the underscore displays correctly
Raspbian doesn’t have the bc calculator by default, so do that first.
For whatever it’s worth, the Pi starts out at 10 °C and warms over 60 °C under heavy load:
Every 2.0s: echo "scale=1 ; d = $(cat /sys/class/thermal/thermal_zone0/temp) / 1000 ; print d , \" °... Sat Jan 14 19:58:59 2017 61.7 °C
It ticks along in the mid 30s under light load.
You can run all that in one tab of a terminal window through VNC. If you’ve got that much GUI goin’ on, just add a thermal monitor in the panel and be done with it.
The Smell of Molten Projects in the Morning 