SMHI MCP Server

MCP server for Swedish Meteorological and Hydrological Institute (SMHI) weather data, built on SMHI's current snow1g point-forecast API.

SMHI retired its older pmp3g forecast API on 2026-03-31 in favor of snow1g. This project is a fresh implementation against the current API.

Features

• get_forecast - Full ~10-day forecast with all parameters

• get_current_weather - Current conditions (temperature, wind, precipitation)

• get_hourly_forecast - Next 1-48 hours hourly

• get_daily_summary - Daily high/low for up to 10 days

• get_fire_risk - Wildfire/forest fire risk forecast (Canadian FWI system)

• get_radar_image - Latest observed precipitation radar composite for Sweden

Related MCP server: mcp-norwegian-weather

Coverage

Sweden, Norway, Finland, Denmark, Estonia, and parts of Latvia/Lithuania. get_radar_image is Sweden-only.

Installation

Claude Code

Add to your Claude Code settings (~/.claude/settings.json):

{
  "mcpServers": {
    "smhi": {
      "command": "node",
      "args": ["/path/to/smhi-mcp-server/dist/index.js"]
    }
  }
}

Build from source

npm install
npm run build

Usage Examples

Get current weather in Stockholm

Tool: get_current_weather
Input: { "latitude": 59.3293, "longitude": 18.0686 }

Get weekly forecast for Gothenburg

Tool: get_daily_summary
Input: { "latitude": 57.7089, "longitude": 11.9746, "days": 7 }

Check if it will rain in Oslo

Tool: get_hourly_forecast
Input: { "latitude": 59.9139, "longitude": 10.7522, "hours": 12 }

Check wildfire risk near Norrköping

Tool: get_fire_risk
Input: { "latitude": 58.5877, "longitude": 16.1924, "period": "daily" }

See what's actually raining right now

Tool: get_radar_image
Input: {}

API Reference

get_forecast

Get complete ~10-day forecast with all SMHI parameters.

get_current_weather

Get current weather conditions.

Returns: temperature (°C), humidity (%), wind (m/s), pressure (hPa), visibility (km), cloud cover (%), precipitation (mm), weather description.

get_hourly_forecast

Get hourly forecast.

get_daily_summary

Get daily weather summary.

Returns: date, high/low temperature (°C), dominant weather, precipitation sum (mm), max wind speed (m/s).

get_fire_risk

Get wildfire/forest fire risk forecast, based on the Canadian Fire Weather Index (FWI) system as run by SMHI (fwif1g API). Calibrated for Swedish forest and grass fuels.

Returns per time step: fire risk class (1-6) and description, the underlying FWI/ISI/BUI/FFMC/DMC/DC indices (unitless), grass fire risk class, forest dryness class (daily only), temperature (°C)/wind (m/s)/humidity (%), and multi-day precipitation sums (mm).

get_radar_image

Get the latest Swedish precipitation radar composite (mosaic of all Swedish radar stations, SMHI's radar comp product), updated roughly every 5 minutes. Unlike the forecast tools above, this reflects observed precipitation happening right now rather than a prediction.

No input parameters.

Returns the radar image (PNG) plus area, product, and validTime/updated timestamps. Coverage: Sweden only.

Development

npm install
npm run typecheck
npm test
npm run build

Data Source

Data provided by SMHI Open Data under CC BY 4.0.

License

MIT