How do I get the CPU temperature?

15 Answers 15

up vote 504 down vote accepted

Install lm-sensors

sudo apt-get install lm-sensors 

After installation type the following in terminal

sudo sensors-detect

You may also need to run

sudo service kmod start

It will ask you few questions. Answer Yes for all of them. Finally to get your CPU temperature type sensors in your terminal.

sensors

Output:

karthick@Ubuntu-desktop:~$ sensors
coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +41.0°C  (high = +78.0°C, crit = +100.0°C)  

coretemp-isa-0001
Adapter: ISA adapter
Core 1:      +41.0°C  (high = +78.0°C, crit = +100.0°C)  

w83627dhg-isa-0290
Adapter: ISA adapter
Vcore:       +1.10 V  (min =  +0.00 V, max =  +1.74 V)   
in1:         +1.60 V  (min =  +1.68 V, max =  +1.44 V)   ALARM
AVCC:        +3.30 V  (min =  +2.98 V, max =  +3.63 V)   
VCC:         +3.28 V  (min =  +2.98 V, max =  +3.63 V)   
in4:         +1.85 V  (min =  +1.66 V, max =  +1.11 V)   ALARM
in5:         +1.26 V  (min =  +1.72 V, max =  +0.43 V)   ALARM
in6:         +0.09 V  (min =  +1.75 V, max =  +0.62 V)   ALARM
3VSB:        +3.30 V  (min =  +2.98 V, max =  +3.63 V)   
Vbat:        +3.18 V  (min =  +2.70 V, max =  +3.30 V)   
fan1:          0 RPM  (min = 10546 RPM, div = 128)  ALARM
fan2:        892 RPM  (min = 2136 RPM, div = 8)  ALARM
fan3:          0 RPM  (min = 10546 RPM, div = 128)  ALARM
fan4:          0 RPM  (min = 10546 RPM, div = 128)  ALARM
fan5:          0 RPM  (min = 10546 RPM, div = 128)  ALARM
temp1:       +36.0°C  (high = +63.0°C, hyst = +55.0°C)  sensor = diode
temp2:       +39.5°C  (high = +80.0°C, hyst = +75.0°C)  sensor = diode
temp3:      +119.0°C  (high = +80.0°C, hyst = +75.0°C)  ALARM  sensor = thermistor
cpu0_vid:   +2.050 V

To see HDD temperature Install hddtemp Install hddtemp

sudo apt-get install hddtemp

Output:

karthick@Ubuntu-desktop:~$ sudo hddtemp /dev/sda        
/dev/sda: ST3160813AS: 34°C
  • 4
    This doesn't work on all hardware. On my system, sensors always shows a temperature of +40.0°C. – Keith Thompson Sep 6 '12 at 18:53
  • 5
    On my 13.04 system, it's sudo service kmod start instead of sudo service module-init-tools start – knb Jul 10 '13 at 6:51
  • 72
    You can run watch sensors to see temperature values updating each second. – Drew Noakes Aug 3 '13 at 21:09
  • 15
    It gives warnings about being risky. Are you sure you should answer "yes" to everything? I don't think they have put those messages there for fun... – Jop V. Sep 28 '13 at 10:50
  • 3
    to answer yes to all sensors-detect questions, run yes yes | sensors-detect – hanshenrik Jan 5 at 21:59

Quick command-line solution; shows temperature in millidegrees Celsius (m°C)

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

Applet

If you are looking for a easier-to-access version, add a Hardware Sensors Monitor to Gnome-Panel:

  1. sudo apt-get install sensors-applet - this will install the sensors-applet Install sensors-applet package
  2. Right-click the panel, select Add to panel..., then select this: alt text

  3. You're done. You can configure which sensors are displayed by right-clicking the applet and selecting Preferences->Sensors.

    alt text

  • 11
    Your command-line solution may not work for all.Because the path will be different for every kernel version. – karthick87 Dec 2 '10 at 10:02
  • 2
    Yeah it didn't work for me. – 8128 Jun 1 '12 at 14:17
  • 3
    My Ubuntu 12.04 system has no /proc/acpi/thermal_zone/THRM/temperature; in fact there's nothing under /proc named temperature. – Keith Thompson Sep 6 '12 at 18:56
  • 12
    Thats because '/proc' is deprecated; try '/sys/class/thermal/thermal_zone0/temp' – mathepic Jul 15 '13 at 19:03
  • 4
    what units for cat /sys/class/thermal/thermal_zone0/temp? Can you convert it to C/F? ... Looks like the first two digits are the first two digits preceding the decimal place and the next are those following the decimal place for Celsius. – dylnmc Feb 24 '16 at 12:33

A good indicator for monitoring temperature, fan speeds and voltage is psensor. It shows output of all sensors, draws graphs. Also selected outputs can be placed in indicator panel.

psensor in action

It can be installed from Ubuntu repositories by clicking psensor Install psensor or typing:

sudo apt-get install psensor

Newer versions of psensor can be installed from ppa:

sudo add-apt-repository ppa:jfi/ppa
sudo apt-get update
sudo apt-get install psensor

It can also draw graphs when you tick the boxes in the graph column:

Screenshot

Here is some information with more pictures.

Another useful link

In some cases not all sensors are displayed. Then you can run

sudo sensors-detect

and answer "yes" to all questions. But is not quite safe in some cases, but I never had any real problems with that. A safer way is to take default answers.

Some additional sensors may appear.

  • Now THIS is the bomb. Right on. – SDsolar Jul 11 '17 at 5:13
  • On my Ubuntu 16.04, psensor will sometimes use 30% cpu, driving the temperature up. – dirkjot Nov 24 '17 at 19:17
  • 1
    its a shit app. takes up 100% cpu – raaj Dec 15 '17 at 12:06
  • The problem still persists. App is unusable. – Eugene Feb 25 at 15:31
  • @raaj - is this bug reported somewhere? – Mateusz Konieczny Jun 21 at 11:57

Temperature without third-party apps

At the time of writing, all the answers involve use of third-party utilities. If you want to find out the temperature without installing anything, use:

$ cat /sys/class/thermal/thermal_zone*/temp
20000
53000
50000
53000
56000
68000
49000
50000

To see what zones the temperatures are referring to use:

$ paste <(cat /sys/class/thermal/thermal_zone*/type) <(cat /sys/class/thermal/thermal_zone*/temp) | column -s $'\t' -t | sed 's/\(.\)..$/.\1°C/'
INT3400 Thermal  20.0°C
SEN1             45.0°C
SEN2             51.0°C
SEN3             57.0°C
SEN4             59.0°C
pch_skylake      77.5°C
B0D4             50.0°C
x86_pkg_temp     51.0°C

The temperatures are stored in Celsius with 3 implied decimal places. sed is used to "prettify" output.

The last temperature is x86_pkg_temp reported at 54.0°C. For the Skylake i7 6700HQ CPU, I used this temperature for Conky display below.

Temperature with Conky

If you don't mind third-party utilities I like to use Conky--a light weight system monitor.

Conky commands

Within conky the system variable I used to monitor an Ivy Bridge CPU is:

${hwmon 2 temp 1}°C

To monitor a Skylake CPU I used:

${hwmon 0 temp 1}°C

Conky display

The conky display looks like this:

enter image description here

The temperature starts at 72°C with a single CPU running at 100% in turbo mode of 3200 MHz. Then turbo is switched off and temp drops 10°C to 62°C with a non-turbo speed of 2600 MHz. 10 seconds later turbo is turned back on and temperatures immediately spike back up to 72°C.


Controlling Temperature

After knowing your temperature you probably want to control it better. tlp works wonders for keeping system under control. It works with thermald, Intel Powerclamp, Battery vs AC for USB power, etc. Although highly configurable I've never had to change the configuration settings for a pleasant Out-Of-The-Box experience. Prior to using it I had all kinds of problems with an IvyBridge laptop overheating all the time. I have it on my new Skylake laptop and the fans NEVER run except when doing Ubuntu 16.04 LTS to 18.04 upgrade.

You can get a very detailed write-up with installation instructions here: Stop cpu from overheating

  • 2
    what unit is this? apples? 1/1000th of °C? 59/29402th of °F? – Blauhirn Sep 3 '17 at 22:53
  • @Blauhirn Linux is reporting temperature as "69000" which is 69.000 degrees Celsius. In all my testing it's always be "000" after the implied decimal point so I'm not sure why Linux formats it that way shrugs. Thanks for your comment though it allowed me update conky display with current version. – WinEunuuchs2Unix Sep 4 '17 at 0:14
  • your quote says 48000 but your text says this is 57 degrees Celsius? I'm confused. – Sun Jun 13 at 7:32
  • @Sun I had regenerated the one-liner using a newer processor and didn't revise the explanation properly. Fixed! – WinEunuuchs2Unix Jun 13 at 10:35
  • 1
    @ncoghlan Thank you. .5 occasionally appears and your sed revisions will handle that nicely. – WinEunuuchs2Unix Oct 15 at 10:42

hardinfo Install hardinfo is very useful tools to get all hardware information.

Install hard info by sudo apt-get install hardinfo. Then you can get temperature by sensors.

sensor

  • 21
    Good looking tool, except every single page populates except Sensors (e.g. is blank)... – frumbert Mar 29 '15 at 13:07
  • 15
    not working for Sensors – Mudit Kapil Apr 14 '15 at 17:00
  • @frumbert I think it depends on lm-sensors! – Pandya Aug 21 '16 at 11:49
  • I also like the ARP table. Pretty handy to verify what is connected to my subnet. – SDsolar Jul 11 '17 at 8:51
  • Benchmarks are quite outdated in this program though. – Ohne Kleidung Mar 6 at 15:04
  1. install the small package of acpi Install acpi by this command

    sudo apt-get install acpi
    
  2. You will need to press Y for confirmation for the first time. Now to find temperature type this command

    acpi -t
    
  • 23
    This is simpler than the answers about lm-sensors. Could you explain the difference between acpi and lm-sensors? – fikr4n Jan 23 '14 at 23:24
  • 1
    On Ubuntu 16.04, Skylake Laptop, acpi -t outputs nothing. It's a valid option, just doesn't work--version: acpi 1.7. – WinEunuuchs2Unix May 25 at 22:50

XSensors

XSensors reads data from the libsensors library regarding hardware health such as temperature, voltage and fan speed and displays the information in a digital read-out.

Open the terminal and type:

sudo apt-get install xsensors lm-sensors

Then detect your computer's hardware sensors by opening the terminal and running the command:

sudo sensors-detect

Then you will get asked a lot of questions about what hardware you want the program to detect. It is generally safe and recommended to accept the default answers to all questions, unless you know what you're doing.

XSensors Screenshot

Xsensors vs. Psensor

XSensors and Psensor both monitor the computer's temperature and the fan speeds. The difference between the two applications is in the level of detail of the information that is displayed and how the information is displayed.

XSensors displays a little bit more specific information than Psensor. Psensor is smaller and more unobtrusive than XSensors and it displays itself on the desktop as a little thermometer icon in the notification area in the upper right corner of the desktop next to the clock. You can right-click the thermometer icon at any time to display the hardware temperatures.

Setting up Psensor to detect your computer's hardware is done the same way as Xsensors, by installing lm-sensors to detect your computer's hardware sensors. Then detect your computer's hardware sensors running the command:

sudo sensors-detect  

and as with Xsensors, accept the default answers to all questions.

In Ubuntu 16.04 Psensor detects your computer's hardware sensors automatically without running sudo sensors-detect

  • 2
    Psensor seems to be more advanced – Serge Jan 13 '17 at 17:03
  • 1
    I agree, @Serge. psensor is the one I am going to use. – SDsolar Jul 11 '17 at 8:48
  • I also use Psensor. – karel Jul 11 '17 at 8:50

After you install lm-sensors:

sudo apt-get install lm-sensors

run:

sudo sensors-detect

you can run the following command to view hardware temps:

watch -n 1 sensors

Also, the fan is usually controled by BIOS.

  • 11
    i like the tip about using watch, it's one of my favorites. i also recommend adding the -d option to watch to highlight the differences. – Joshua K Dec 25 '15 at 20:05
  • This gave me 4 core temp reading on my i7-3770 on Ubuntu 16.0.4 LTS running 100% CPU (~77 degrees Celsius) – Sun Jun 13 at 7:35

On Raspberry Pi, you can retrieve the temperatureusing vcgencmd:

vcgencmd measure_temp

Output:

temp=39.0'C
  • 2
    No, that will give you the frequency. Use vcgencmd measure_temp – MrD Dec 19 '16 at 13:44
  • Sorry, a very painful copy & paste mistake :) – Ercksen Apr 25 at 17:43

Just so you guys know, none of this install junk like sensors are needed. Just do an acpi -V and BOOM, you got everything. Example:

Battery 0: Charging, 91%, 00:17:25 until charged
Battery 0: design capacity 3310 mAh, last full capacity 3309 mAh = 99%
Adapter 0: on-line
Thermal 0: ok, 40.0 degrees C
Thermal 0: trip point 0 switches to mode critical at temperature 127.0 degrees C
Thermal 0: trip point 1 switches to mode hot at temperature 127.0 degrees C
Cooling 0: pkg-temp-0 no state information available
Cooling 1: LCD 0 of 100
Cooling 2: Processor 0 of 10
Cooling 3: Processor 0 of 10
Cooling 4: Processor 0 of 10
Cooling 5: Processor 0 of 10

WAY easier than installing all of this and kmod... Just do acpi -V.

  • 25
    Right… because you don’t have to install that one? Wrong! The program 'acpi' is currently not installed. You can install it by typing: sudo apt-get install acpi – e-sushi Oct 1 '14 at 20:32
  • 8
    And, it also doesn't always give the same information. On my machine, sensors provides the temperature whereas acpi -V doesn't show anything about it, unfortunately. – Per Lundberg Oct 16 '15 at 21:36
  • 1
    acpi -V is broken for Skylake laptop, Ubuntu 16.04, acpi version 1.7 – WinEunuuchs2Unix May 25 at 22:54
/sys/class/thermal/thermal_zone0/temp

this file holds cpu temperature. So, you can make a script named temp and move it to /bin then in terminal enter temp.

My temp file looks like -

 #!/bin/bash
 cpu_temp=$(< /sys/class/thermal/thermal_zone0/temp)
 cpu_temp=$(($cpu_temp/1000))
 echo $cpu_temp°C

my answer is modified of www.cyberciti.biz

  • I've tried 4 machines in different locations and they all give the same reading = 27800. Do you know why this could be? They can't all have the same cpu temp. – Katu Mar 10 '17 at 14:08
  • @Katu I think that might mean 27.8 degrees. I used another program and found my Core 0 was 49 C. Then I did the above command and got 49000. – Philip Kirkbride Apr 20 '17 at 18:06

computertemp Install computertemp is a simple applet that shows your current CPU temperature + it has some additional features like alarms. Unfortunately it's not possible (or at least I don't know how) to change its background color, so it doesn't look very nice with the standard Ubuntu theme.

It can be installed the same way as the sensors-applet described in evgeny's answer.


Alt text

computertemp is not available in the newer Ubuntu repositories.

  • 2
    in Ubuntu 15.04 sudo apt-get install computertemp results in the error "Unable to locate package computertemp" ... – Nicolas Ivanov Jun 22 '15 at 14:32

If you like Python, you can use psutil.

>>> import psutil
>>> psutil.sensors_temperatures()['coretemp']
[shwtemp(label='Physical id 0', current=67.0, high=100.0, critical=100.0), shwtemp(label='Core 0', current=67.0, high=100.0, critical=100.0), shwtemp(label='Core 1', current=65.0, high=100.0, critical=100.0)]

... will do the job. With a little coding, you can for example obtain the Temp vs CPU of your system.

enter image description here

It's convenient to update psutil by issuing sudo pip3 install psutil --upgrade.

  • I have it on Python 2 but it doesn't have a sensors_temperatures attribute, and I don't have it on Python 3. I'm using Ubuntu 14.04. So how do I get it? – wjandrea Feb 16 at 0:16
  • what version of psutil are you using? mine is 5.4.3. Try upgrading you version: sudo pip2 install psutil --upgrade. – Lucas Aimaretto Feb 16 at 0:22
  • 1
    I'm using 1.2.1 on Python 2, and the upgrade fails (but Python 2 on 14.04 is really outdated, so I'm not concerned). I just installed 5.4.3 on Python 3 with sudo pip3 install psutil --upgrade. Could you add that to your answer? – wjandrea Feb 16 at 0:27
  • On that plot, the x-axis is CPU usage, right? – wjandrea Feb 16 at 0:32
  • Done the update of the answer. Yes, the X axis is CPU usgae: I'm having trouble with a laptop: is heating a lot (+65°C) with very low CPU (aprox 5%) – Lucas Aimaretto Feb 16 at 1:01
printf '%d°\n' $(sensors | grep 'id 0:' | awk '{ print $4 }') 2>/dev/null
55°

printf '%d\n' Will convert the value to integer in case you need it as a round number

  • 1
    Why echo $(printf ..) and not just printf '%d°\n' $(sensors | grep 'id 0:' | awk '{ print $4 }') 2>/dev/null? ... Or even just sensors 2>/dev/null | awk '/id 0:/{printf "%d°\n", $4}' – muru Apr 8 at 1:08
  • Yes, a lot of possibility, i just posted the one i was using – intika Apr 8 at 2:28

If you are using Ubuntu with MATE Desktop Environment, you can use MATE Sensors Applet:

  1. Install the package:

    sudo apt-get install mate-sensors-applet
    

    And if you have Nvidia graphics card you can also install mate-sensors-applet-nvidia package.

  2. Make right click on MATE Panel and click Add to Panel then choose Hardware Sensors Monitor

    Hardware Sensors Monitor

  3. After adding you can setup it by doing right click on any sensor and selecting Preferences

    Preferences Hardware Sensors Monitor

    Here you can customize the list of sensors: CPU, Motherboard and GPU temperature, main voltages (Vcore, 3.3V, 5V, 12V, etc) and fan speeds. The full list depends on hardware (image above is for desktop with Nvidia graphics card).

  4. The result will look like

    Sensors

Of course you can move this applet to the best location.

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