SMN - Servicio Meteorológico Nacional

Home Assistant integration for Argentina's National Weather Service (Servicio Meteorológico Nacional).

Features

Weather Entity

• Current weather conditions (temperature, humidity, pressure, wind)
• Feels-like temperature
• Daily forecast with high/low temperatures
• Hourly forecast details
• Automatic weather condition icons based on SMN data

Alert Binary Sensors

• Weather Alert: Main sensor showing all active alerts
• Event-specific sensors for 11 different weather events:
  • Tormenta (Thunderstorm) ⚡
  • Lluvia (Rain) 🌧️
  • Nevada (Snow) ❄️
  • Viento (Wind) 💨
  • Viento Zonda 🌪️
  • Altas Temperaturas (High Temp) 🌡️
  • Bajas Temperaturas (Low Temp) 🥶
  • Niebla (Fog) 🌫️
  • Polvo (Dust) 💨
  • Humo (Smoke) 💨
  • Ceniza Volcánica (Volcanic Ash) 🌋
• Short-term Alert: Critical immediate weather warnings
• Home Assistant events fired for automations (argentina_smn_alert_created, argentina_smn_alert_updated, argentina_smn_alert_cleared)

Services

• argentina_smn.get_alerts: Get weather alerts for configured location
• argentina_smn.get_alerts_for_location: Get alerts for any location ID

Installation

HACS (Recommended)

1. Add this repository as a custom repository in HACS
2. Search for "SMN" in HACS
3. Click Install
4. Restart Home Assistant

Manual

1. Copy the custom_components/argentina_smn folder to your custom_components directory
2. Restart Home Assistant

Configuration

1. Go to Settings → Devices & Services
2. Click Add Integration
3. Search for SMN
4. Choose one of:
   • Track home location: Automatically uses your Home Assistant location
   • Custom location: Enter specific latitude/longitude coordinates

The integration will automatically fetch the location name from SMN's database.

Example Automations

Alert Notification

automation:
  - alias: "SMN Weather Alert Notification"
    trigger:
      - platform: state
        entity_id: binary_sensor.ciudad_de_buenos_aires_weather_alert
        to: "on"
    action:
      - service: notify.mobile_app
        data:
          title: "Alerta Meteorológica"
          message: "{{ state_attr('binary_sensor.ciudad_de_buenos_aires_weather_alert', 'alert_summary') }}"

Storm Alert

automation:
  - alias: "Storm Alert - Close Windows"
    trigger:
      - platform: state
        entity_id: binary_sensor.ciudad_de_buenos_aires_alert_tormenta
        to: "on"
    action:
      - service: notify.mobile_app
        data:
          title: "Alerta de Tormenta"
          message: "Cierra las ventanas - {{ state_attr('binary_sensor.ciudad_de_buenos_aires_alert_tormenta', 'description') }}"

Data Provided

Weather Attributes

• Temperature (°C)
• Feels like temperature (°C)
• Humidity (%)
• Atmospheric pressure (hPa)
• Wind speed (km/h) and direction (°)
• Visibility (m)
• Weather condition with appropriate icon

Alert Attributes

• Active alert count
• Maximum severity level
• Alert summary
• Detailed instructions
• Area ID
• Last updated timestamp

API Information

This integration uses the SMN public API endpoints:

• Base URL: https://ws1.smn.gob.ar/v1
• Authentication: JWT token (automatically managed)
• Update interval: 30 minutes for weather, 10 minutes for alerts

Troubleshooting

Integration fails to load

• Verify your internet connection
• Check Home Assistant logs for errors: Settings → System → Logs
• Restart Home Assistant

Weather data not updating

• The integration updates every 30 minutes
• Check the coordinator last update time in Developer Tools → States
• Verify SMN API is accessible from your network

Location not found

• Ensure coordinates are within Argentina
• Try slightly different coordinates if your exact location isn't in SMN's database
• Use coordinates of nearby major cities

Enable debug logging

Add to configuration.yaml:

logger:
  default: info
  logs:
    custom_components.argentina_smn: debug

Credits

Data provided by Servicio Meteorológico Nacional Argentina.

License

This integration is provided as-is under the MIT License.