Caiyun Weather MCP Server

Hosted Server

Caiyun Weather provides a hosted Streamable HTTP MCP server, so you can use the weather tools without installing or running this package locally.

{
  "url": "https://mcp-weather.caiyunapp.com/mcp",
  "headers": {
    "X-Caiyun-API-Key": "YOUR_CAIYUN_WEATHER_API_KEY"
  }
}

The outer configuration format depends on your MCP client. Before getting started, register and apply for a Caiyun Weather API key, then pass it in the X-Caiyun-API-Key request header.

Setup Instructions

Install uv first.

MacOS/Linux:

curl -LsSf https://astral.sh/uv/install.sh | sh

Windows:

powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

Setup with Claude Desktop

# claude_desktop_config.json
# Can find location through:
# Hamburger Menu -> File -> Settings -> Developer -> Edit Config
{
  "mcpServers": {
    "caiyun-weather": {
      "command": "uvx",
      "args": ["mcp-caiyun-weather"],
      "env": {
        "CAIYUN_WEATHER_API_TOKEN": "YOUR_API_KEY_HERE"
      }
    }
  }
}

Ask Claude a question requiring weather

e.g. "What's the weather in Beijing Now?"

Local/Dev Setup Instructions

Setup with Claude Desktop

# claude_desktop_config.json
# Can find location through:
# Hamburger Menu -> File -> Settings -> Developer -> Edit Config
{
  "mcpServers": {
    "caiyun-weather": {
      "command": "uv",
      "args": [
        "--directory",
        "/ABSOLUTE/PATH/TO/PARENT/FOLDER/mcp-caiyun-weather",
        "run",
        "mcp-caiyun-weather"
      ],
      "env": {
        "CAIYUN_WEATHER_API_TOKEN": "YOUR_API_TOKEN_HERE"
      }
    }
  }
}

Debugging

Run:

npx @modelcontextprotocol/inspector \
      uv \
      --directory /ABSOLUTE/PATH/TO/PARENT/FOLDER/mcp-caiyun-weather \
      run \
      mcp-caiyun-weather

Available Tools

• get_realtime_weather: Get real-time weather data for a specific location

  • Parameters:

    • lng: The longitude of the location

    • lat: The latitude of the location

  • Returns detailed information including:

    • Temperature and apparent temperature

    • Sky condition

    • Humidity

    • Wind speed and direction

    • Precipitation intensity

    • Air quality metrics (PM2.5, PM10, O3, SO2, NO2, CO)

    • AQI (China and USA standards)

    • Life indices (UV and Comfort)

• get_hourly_forecast: Get an hourly weather forecast for a configurable number of hours

  • Parameters:

    • lng: The longitude of the location

    • lat: The latitude of the location

    • hours: The number of hours to return (1–360, defaults to 72)

  • Returns hourly forecast including:

    • Temperature

    • Weather conditions

    • Rain probability

    • Precipitation intensity (mm/hr)

    • Wind speed and direction

• get_weekly_forecast: Get daily weather forecast for the next 7 days

  • Parameters:

    • lng: The longitude of the location

    • lat: The latitude of the location

  • Returns daily forecast including:

    • Temperature range (min/max)

    • Weather conditions

    • Rain probability

• get_historical_weather: Get historical weather data for the past 24 hours

  • Parameters:

    • lng: The longitude of the location

    • lat: The latitude of the location

  • Returns historical data including:

    • Temperature

    • Weather conditions

• get_weather_alerts: Get weather alerts for a specific location

  • Parameters:

    • lng: The longitude of the location

    • lat: The latitude of the location

  • Returns weather alerts including:

    • Alert title

    • Alert code

    • Alert status

    • Alert description

Note: All tools require a valid Caiyun Weather API token to be set in the environment variable CAIYUN_WEATHER_API_TOKEN.