Check temperature of Raspberry Pi CPU

Related: Monitor Raspberry Pi DC input voltage


Check Raspberry Pi CPU Temperature:

/opt/vc/bin/vcgencmd measure_temp

A light-moderate use Raspberry Pi 2 in an office environment measures in the 40 - 45 ℃ range (no fan, small heatsink, with case).

A red thermometer icon superimposed on the Raspberry Pi display output means the Raspberry Pi is overheating and is throttling the CPU and GPU to avoid self-destruction.

CPU temperature [C] icon throttle
< 80 none none
80 - 85 half full thermometer red CPU
> 85 full thermometer red CPU & GPU

CPU clock

The current Raspberry Pi CPU speed (actual speed, not limits or requested speed) is obtained from

vcgencmd measure_clock arm

The output is in units of Hertz:

frequency(45)=1199998000

The Raspberry Pi CPU clock speed and power consumption is dynamic:

clock speed [MHz] Raspi 2 Raspi 3 Raspi 3+
idle 600 600 600
100% one or more cores 900 1200 1400

Log CPU/temperature

You can use crontab -e for setting a schedule to periodically log temperature and CPU frequency.

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Written by Michael Hirsch, Ph.D. //

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