Open-Meteo

The Open-Meteo integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] adds free weather forecasts to Home Assistant for any location you choose, with no account or API key to set up.

Open-Meteo is a weather service that is free for open-source and non-commercial use. It works together with national weather services and picks the best available forecast model for your location, at a resolution of 1 to 11 km. Point it at your home, a holiday address, or any other place you have set up as a zone, and Home Assistant gets the current conditions and a forecast you can show on a dashboard or use to drive automations, such as a reminder to bring in the laundry before the rain arrives.

Prerequisites

You need a zoneZones allow you to specify certain regions on a map. They enable zone presence-detection and can be used in automations. For example, to start the vacuum after you left home or start the heating at home when you leave the office. [Learn more] to forecast for. Home Assistant already has a Home zone set to your installation’s location, so in most cases there is nothing to prepare. To forecast for another place, add a zone first under Settings > Areas, labels & zones.

No account or API key is required.

Configuration

To add the Open-Meteo service to your Home Assistant instance, use this My button:

Each zone you add gives you one weather entity, named after that zone. To forecast for more than one location, add the integration again and choose a different zone.

Supported functionality

Weather

The integration provides a single weather entity for the selected zone. It reports the current conditions along with a daily and an hourly forecast.

The current conditions include:

• The weather condition, such as sunny, cloudy, or rainy
• Temperature
• Wind speed and direction

The daily forecast covers, for each day, the condition, the high and low temperature, the apparent temperature, the expected precipitation, and the wind speed, gusts, and direction. The hourly forecast covers, for each hour ahead, the condition, the temperature and apparent temperature, the precipitation, the humidity, the dew point, the cloud cover, the air pressure, and the wind speed, gusts, and direction.

You can show the forecast on a dashboard with the weather card, or read it in an automation or script with the weather.get_forecasts action. Temperature, wind speed, and precipitation are shown in the units from your Home Assistant settings.

Use cases

• Show the weather for home on a dashboard with the weather card, and add a second zone to see the weather at a holiday home or your parents’ place next to it.
• Get a reminder to bring in the laundry, or to skip watering the garden, when rain is expected.
• Get a warning the evening before a frosty night, to cover your plants or put a cover on the car’s windshield.
• Close the awning or sunscreens ahead of a windy day.

Examples

The examples below use the daily forecast of the Home zone, weather.home, read with the weather.get_forecasts action. The first day in the forecast is today, the second one is tomorrow.

Notify when rain is expected tomorrow

Every evening at 20:00, this automation checks the forecast for tomorrow, and sends a notification when rain is expected.

automation:
  - alias: "Rain expected tomorrow"
    triggers:
      - trigger: time
        at: "20:00:00"
    actions:
      - action: weather.get_forecasts
        target:
          entity_id: weather.home
        data:
          type: daily
        response_variable: forecast
      - variables:
          tomorrow: "{{ forecast['weather.home'].forecast[1] }}"
      - condition: template
        value_template: "{{ tomorrow.precipitation | float(0) > 0 }}"
      - action: notify.notify
        data:
          message: >
            Rain is expected tomorrow: {{ tomorrow.precipitation }}
            {{ state_attr('weather.home', 'precipitation_unit') }}.

Warn about frost tomorrow

Every evening at 18:00, this automation sends a notification when the low for tomorrow is below freezing, so you have time to cover your plants. It compares the low with 0, for temperatures in °C; use 32 instead when your Home Assistant uses °F.

automation:
  - alias: "Frost expected tomorrow"
    triggers:
      - trigger: time
        at: "18:00:00"
    actions:
      - action: weather.get_forecasts
        target:
          entity_id: weather.home
        data:
          type: daily
        response_variable: forecast
      - variables:
          tomorrow: "{{ forecast['weather.home'].forecast[1] }}"
      - condition: template
        value_template: "{{ tomorrow.templow | float(99) < 0 }}"
      - action: notify.notify
        data:
          message: >
            Frost is expected tomorrow, down to {{ tomorrow.templow }}
            {{ state_attr('weather.home', 'temperature_unit') }}. Cover your plants!

Data updates

Home Assistant pollsData polling is the process of querying a device or service at regular intervals to check for updates or retrieve data. By defining a custom polling interval, you can control how frequently your system checks for new data, which can help optimize performance and reduce unnecessary network traffic. [Learn more] Open-Meteo for new data every 30 minutes.

Known limitations

• Open-Meteo is free for open-source and non-commercial use. For commercial use, see the Open-Meteo website.
• A forecast is only as precise as the weather model available for the chosen location, so accuracy varies from place to place.
• New data arrives every 30 minutes, so the current conditions are not real-time.

Troubleshooting

The weather entity shows as unavailable

Open-Meteo is an online service. If the weather entity becomes unavailable, check that your Home Assistant instance can reach the internet. The entity recovers on its own once Open-Meteo is reachable again and the next update succeeds.

Removing the integration

This integration follows standard integration removal. No extra steps are required.

To remove an integration instance from Home Assistant

1. Go to Settings > Devices & services and select the integration card.
2. Next to the entry you want to remove, select the three dots menu. Then, select Delete.
   • Depending on the integration, the entries are listed under one of the following headings:
     • Devices
     • Hubs
     • Services
     • Integration entries
3. To confirm, select Delete.
   • Home Assistant also deletes the devices and entities of the entry.
4. If Home Assistant asks you to restart, restart Home Assistant.
5. If Home Assistant asks whether to also delete the application credentials, select Remove or Keep.
   • If you keep them, Home Assistant uses them automatically when you add the integration again.
   • To delete them later, refer to Deleting application credentials.