plasma5-applet-thermal-monitor from home:ahjolinna project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ahjolinna/openSUSE_Tumbleweed/home:ahjolinna.repo zypper refresh zypper install plasma5-applet-thermal-monitor