If you purchased the small yet awesome orange pi zero on Aliexpress you certainly had huge problems to download some OS images on the official Orange PI website ,
you can download an image on the armbian website that’s compatible with the Orange pi zero
when your orange pi zero is finally fonctional there is several way to get the current temperature of the CPU.
first you can use the command : armbianmonitor -m this command is going to give you , the uptime , cpu speed and the current CPU temperature every 6 seconds.
but if you want to get that temperature for graphing purpose for cacti , munin , or grafana this command is not going to be usefull because of the autorefresh functionality
there is an other command that just return the cpu temperature
there is two sensor inside the Allwinner H2+ , you can add the two values and then divide the result by two to get an average temperature.
then you can graph the temperature using grafana for example