Weather MCP Server

Weather MCP Server

A Model Context Protocol (MCP) server that provides weather data from the National Weather Service API.

Features

• Get weather forecasts by geographic coordinates
• Get weather alerts by US state
• Clean, formatted weather data for LLM consumption
• Integration with Claude and other MCP-compatible clients

Prerequisites

• Node.js (LTS version recommended)
• npm or yarn

Installation

1. Clone the repository

git clone https://github.com/nakamurau1/weather-mcp.git
cd weather-mcp

2. Install dependencies

npm install

3. Build the server

npm run build

Usage

Running the server directly

npm start

Or directly:

./dist/index.js

Connecting to Claude Desktop

1. Edit your Claude Desktop configuration file:

# MacOS
code ~/Library/Application\ Support/Claude/claude_desktop_config.json

2. Add the weather-mcp server configuration:

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

3. Restart Claude Desktop

4. Test the server with queries like:

   • "What's the weather in Sacramento?"
   • "Are there any active weather alerts in Texas?"

Available Tools

get_forecast

Gets weather forecast for a geographic location.

Parameters:

• latitude: Latitude of the location (number between -90 and 90)
• longitude: Longitude of the location (number between -180 and 180)

get_alerts

Gets active weather alerts for a US state.

Parameters:

• state: Two-letter US state code (e.g., "CA", "NY", "TX")

Resource Templates

Weather alerts by state

URI Template: weather://{state}/alerts

Example: weather://CA/alerts

Limitations

• Weather data is limited to United States locations (NWS API)
• No historical weather data, only current conditions and forecasts

Development

• Run in development mode: npm run dev
• Build the project: npm run build

License

ISC