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.