Average between multiple sensors - JiltedGeek/HomeAssistant GitHub Wiki

In sensors.yaml I added a sensor that calculates the average between multiple sensor outputs.

- platform: template 
  sensors:
    woonkamer_temp_average:
      friendly_name: 'woonkamer_temp_average'
      unit_of_measurement: "°C"
      value_template: >-
        {{(float(states.sensor.woonkamer_temp.state) + float(states.sensor.woonkamer_sensor_temp.state) + float(states.sensor.woonkamer_tado_temp.state)) / 3 | round(2)}}