aria-mcp-weather-dk

A Model Context Protocol (MCP) server that exposes Danish weather forecasts and severe-weather warnings to AI assistants. Built for ARIA and shareable with the community.

Fully keyless — both data sources are open and require no API key.

Data Sources

Source	What	License / Attribution
DMI Open Data	Hourly point forecasts (Harmonie DINI SF model)	CC BY 4.0 — requires attribution to DMI
MeteoAlarm	Severe weather warnings for Denmark	© MeteoAlarm / national met services — see terms

Install & Run

npx aria-mcp-weather-dk

Or install globally:

npm install -g aria-mcp-weather-dk
aria-mcp-weather-dk

Requires Node.js 20 or later.

Tools

get_forecast

Fetch an hourly weather forecast for a geographic point (up to 72 hours).

Parameters:

Name	Type	Required	Description
lat	number	Yes*	Latitude (WGS84 decimal degrees)
lon	number	Yes*	Longitude (WGS84 decimal degrees)
hours	number	No	Hours to forecast (1–72, default 24)

*Not required if DEFAULT_LAT / DEFAULT_LON env vars are set.

Returns: Array of forecast entries:

[
  {
    "time": "2024-06-01T12:00:00Z",
    "temperatureC": 18.5,
    "windSpeedMs": 4.2,
    "windDirDeg": 220,
    "humidityPct": 68,
    "precipitationMm": 0.0,
    "cloudCoverPct": 40
  }
]

Fields are omitted when not available from the API.

---

get_current

Fetch the forecast entry closest to the current time.

Parameters: lat, lon (same as above)

Returns: A single forecast entry (same shape as above).

---

get_warnings

Fetch active severe weather warnings for Denmark from MeteoAlarm.

Parameters: None

Returns (warnings present):

[
  {
    "id": "https://www.meteoalarm.org/alerts/DK-...",
    "event": "Wind",
    "severity": "Severe",
    "urgency": "Expected",
    "certainty": "Likely",
    "area": "Jutland",
    "onset": "2024-06-01T18:00:00Z",
    "expires": "2024-06-02T06:00:00Z",
    "headline": "Orange wind warning for Jutland",
    "description": "Strong winds expected...",
    "awarenessType": "1; Wind",
    "awarenessLevel": "3; orange; Severe"
  }
]

Returns (no active warnings):

{
  "status": "no_active_warnings",
  "message": "No active severe weather warnings for Denmark.",
  "checkedAt": "2024-06-01T12:00:00.000Z"
}

Environment Variables

Variable	Description
DEFAULT_LAT	Default latitude — makes lat optional in get_forecast and get_current
DEFAULT_LON	Default longitude — makes lon optional in get_forecast and get_current

These are purely convenience defaults. The server remains generic — no location is hardcoded.

ARIA MCP Config

Add to your ARIA credentials / MCP config to use with ARIA:

{
  "command": "npx",
  "args": ["-y", "aria-mcp-weather-dk"],
  "env": {
    "DEFAULT_LAT": "55.6761",
    "DEFAULT_LON": "12.5683"
  }
}

Replace the coordinates with your preferred default location, or omit env entirely and always pass coordinates explicitly.

Development

git clone https://github.com/kimhjort/aria-mcp-weather-dk
cd aria-mcp-weather-dk
npm install
npm run build
npm test

License

MIT — see LICENSE.

Data from DMI is licensed CC BY 4.0. MeteoAlarm data is owned by the respective national meteorological services; see their terms before redistribution.