Pleased to offer a nice small applet from a new independent budgie developer
Called CPUTemp - it displays the temperature of a number of sensors.
Lookout for additional options in the applet panel budgie-desktop-settings.
Welcome needs to be updated - but it can be now installed on focal/groovy/hirsute for both intel/amd and raspberry pi
sudo add-apt-repository ppa:ubuntubudgie/backports
sudo apt install budgie-cputemp-applet
logout and login and add the CPU Temp applet to your panel
All feedback to upstream GitHub - tarkah/budgie-cputemp-applet: CPU temperature applet for Budgie (especially positive feedback!)