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
• get_weather_warnings - Active official SMHI weather warnings/alerts (wind, rain, snow, thunder, flooding, fire risk, etc.)
• get_weather_analysis - Past ~24h gridded meteorological analysis ("what's actually happening"), not a forecast

Coverage

Sweden, Norway, Finland, Denmark, Estonia, and parts of Latvia/Lithuania. get_radar_image and get_weather_warnings are 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: {}

Check for active storm warnings in Stockholm county

Tool: get_weather_warnings
Input: { "county": "Stockholm", "minSeverity": "YELLOW" }

See what's actually happened in Malmö over the last few hours

Tool: get_weather_analysis
Input: { "latitude": 55.6050, "longitude": 13.0038, "hours": 6 }

API Reference

get_forecast

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

Parameter	Type	Required	Description
latitude	number	Yes	-90 to 90
longitude	number	Yes	-180 to 180

get_current_weather

Get current weather conditions.

Parameter	Type	Required	Description
latitude	number	Yes	-90 to 90
longitude	number	Yes	-180 to 180

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

get_hourly_forecast

Get hourly forecast.

Parameter	Type	Required	Default	Description
latitude	number	Yes	-	-90 to 90
longitude	number	Yes	-	-180 to 180
hours	number	No	24	1-48

get_daily_summary

Get daily weather summary.

Parameter	Type	Required	Default	Description
latitude	number	Yes	-	-90 to 90
longitude	number	Yes	-	-180 to 180
days	number	No	7	1-10

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.

Parameter	Type	Required	Default	Description
latitude	number	Yes	-	-90 to 90
longitude	number	Yes	-	-180 to 180
period	string	No	daily	daily (~6 days ahead, afternoon fire risk) or hourly (next 48 hours)

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.

get_weather_warnings

Get currently active official SMHI weather warnings (impact-based warnings, ibwwarnings/IBWwarnings API). Not coordinate-based — returns all active warnings for Sweden, each tagged with the county/area it affects; filter client-side by severity and/or county.

Parameter	Type	Required	Default	Description
language	string	No	en	en or sv
minSeverity	string	No	-	RED, ORANGE, YELLOW, or MESSAGE — only return warnings at or above this severity
county	string	No	-	Case-insensitive substring match against the warning's area name and affected counties, e.g. "Stockholm"

Returns count plus a flat warnings array (one entry per warning area) with event, severity/severityCode, areaName, affectedCounties, descriptions (title/text pairs), approximateStart, and published. Coverage: Sweden only.

get_weather_analysis

Get the past ~24 hours of gridded meteorological analysis (SMHI's mesan2g/Mesan2gv3 API): a "best current estimate" of conditions, blending observations with a short-range model on a ~2.5 km grid, not a forecast. Useful for nowcasting at a point without a nearby observation station, checking how a past forecast turned out, or "what was the weather really like" lookups.

Parameter	Type	Required	Default	Description
latitude	number	Yes	-	-90 to 90
longitude	number	Yes	-	-180 to 180
hours	number	No	24	1-24, most recent hours to return

Returns hourly entries (most recent first): temperature (°C, plus min/max at some hours), dew point, wet-bulb temperature (°C), humidity (%), wind speed/direction/gust (m/s), pressure (hPa, sea-level and station), visibility (km), cloud cover (total/low/medium/high, %) and base/top altitude (m), precipitation over the last 1/3/12/24h (mm — the 3/12/24h windows are only populated at some hours), snow depth change over the last hour (cm), and a weather symbol/description.

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