cumulative_rain_hass.yaml

  - alias: 'record cumulative rain to midnight'
    trigger:
      - platform: time
        at: "00:00:01"
    action:
      service: mqtt.publish
      data_template:
        topic: 'hass/cum_rain_prior'
        retain: true
        payload: '{"day_1":"{{states.sensor.rain_cum.state}}"}'