How To Check CPU Temperature on Ubuntu

In this tutorial, we will show you how to check CPU temperature on Ubuntu. For those of you who didn’t know, Monitoring your CPU temperature is a crucial task for every Ubuntu user. Overheating can lead to reduced performance, system instability, and even permanent hardware damage. Keeping an eye on your CPU temp allows you to ensure your system is running within safe limits and helps you identify potential cooling issues before they become serious problems.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step check CPU temperature on Ubuntu Linux. You can follow the same instructions for Ubuntu 20.04, 18.04, and any other Debian-based distribution like Linux Mint.

Prerequisites

• A server running one of the following operating systems: Ubuntu 22.04, 20.04, and any other Debian-based distribution like Linux Mint.
• It’s recommended that you use a fresh OS install to prevent any potential issues.
• SSH access to the server (or just open Terminal if you’re on a desktop).
• An active internet connection.
• A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Check CPU Temperature on Ubuntu

Step 1. First, make sure that all your system packages are up-to-date by running the following apt commands in the terminal.

sudo apt update
sudo apt upgrade

Step 2. Check CPU temperature on Ubuntu.

There are three ways that you can use to check your CPU temperature:

• Install lm_sensor.

Lm_sensors comes pre-installed with most modern Linux operating systems. If it is not installed already, you can install it as shown below:

sudo apt install lm-sensors hddtemp

Once installed, run the following command to configure lm_sensors:

sudo sensors-detect

When the configuration is done, check the CPU temperature by invoking the sensors command. This will display the temperature of your CPU cores as shown below:

sensors

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +54.0°C  (high = +79.0°C, crit = +83.0°C)
Core 0:        +54.0°C  (high = +79.0°C, crit = +83.0°C)
Core 1:        +52.0°C  (high = +79.0°C, crit = +83.0°C)

BAT0-acpi-0
Adapter: ACPI interface
in0:          12.43 V  
curr1:       1000.00 uA 

dell_smm-virtual-0
Adapter: Virtual device
Processor Fan: 3449 RPM
CPU:            +59.0°C  
Other:          +52.0°C  
Other:          +51.0°C  
GPU:            +14.0°C  
Other:          +51.0°C  

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +57.5°C  (crit = +84.0°C)

• Using the sensors Command to Check CPU Temp

Now that you have lm-sensors installed, you can easily check your CPU temperature using the sensors command in the terminal. Here’s how to interpret the output and understand the temperature readings:

When you run the sensors command, you’ll see output similar to the following:

coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +45.0°C (high = +80.0°C, crit = +100.0°C)
Core 0: +43.0°C (high = +80.0°C, crit = +100.0°C)
Core 1: +45.0°C (high = +80.0°C, crit = +100.0°C)

In this example, the output shows the temperature readings for the CPU package and individual cores. The “Package id 0” line represents the overall CPU temperature, while the “Core 0” and “Core 1” lines show the temperatures for each individual CPU core.

The temperature values are displayed in degrees Celsius (°C). The “high” value indicates the maximum temperature threshold before the CPU starts throttling to prevent overheating. The “crit” value represents the critical temperature limit, beyond which the CPU may suffer permanent damage.

To monitor your CPU temperature continuously, you can use the watch command in combination with sensors:

watch -n 1 sensors

This command will update the sensor output every second, allowing you to keep an eye on your CPU temperature in real-time.

While the sensors command provides a quick and easy way to check your CPU temperature, it may not be the most user-friendly or visually appealing method for everyone. In the next section, we’ll explore a graphical alternative called Psensor.

• Install Psensors tool.

Psensor is a graphical tool that relies on the lm_sensors program to display temperature readings in a graphical format. Run the following command to install it:

sudo apt install psensor

Once the installation is complete, you can use the application to search for the Psensor application and launch it. Therefore, the window below will be displayed:

Step 3. Best Practices for Monitoring CPU Temperature.

Now that you know how to check your CPU temperature, here are some best practices to ensure your system’s optimal performance:

• Importance of Regular Monitoring

Frequent monitoring is crucial to identify abnormal temperature fluctuations early. Overheating can lead to system instability and hardware damage, so checking your CPU temperature regularly is essential for system health.

• Optimal Temperature Range for CPUs

Most CPUs operate best within a specific temperature range, typically between 50°C and 80°C. Staying within this range helps maintain performance and prolong the life of your CPU.

• Cooling Solutions and Maintenance Tips

To keep your CPU temperature in check, consider the following cooling and maintenance tips:

1. Ensure your computer’s cooling system, including fans and heat sinks, is clean and functioning correctly.
2. Proper cable management can improve airflow and prevent heat buildup.
3. In extreme cases, you may want to invest in additional cooling solutions, such as better fans or liquid cooling systems.

By following these steps and maintaining a watchful eye on your CPU temperature, you can ensure your Ubuntu system remains in excellent health, running smoothly and efficiently.