Weather MCP Server

A Model Context Protocol (MCP) server that provides real-time weather information for any location worldwide using the wttr.in service.

Overview

This MCP server exposes a fetch_weather tool that allows AI assistants like Claude to retrieve current weather information for any city or location. It's built using FastMCP and provides a simple, reliable interface for weather data.

Features

🌤️ Real-time weather information for any location
🌍 Worldwide coverage
⚡ Fast and lightweight
🔌 Easy integration with MCP-compatible clients (Claude Desktop, etc.)
📦 Simple setup with minimal dependencies

Prerequisites

Python 3.12 or higher
uv package manager (recommended) or pip

Installation

Clone this repository:

git clone <your-repo-url>
cd weather-mcp

Install dependencies using uv:

uv pip install -e .

Or using pip:

pip install -e .

Configuration

Claude Desktop

To use this server with Claude Desktop, add the following configuration to your Claude Desktop config file:

MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "weather-bot": {
      "command": "uv",
      "args": [
        "--directory",
        "/absolute/path/to/weather-mcp",
        "run",
        "main.py"
      ]
    }
  }
}

Replace /absolute/path/to/weather-mcp with the actual path to this project directory.

Usage

Once configured, the weather tool will be available to your AI assistant. You can ask questions like:

"What's the weather in London?"
"Tell me the current weather in New York"
"How's the weather in Tokyo?"

Running Standalone

You can also run the server directly for testing:

python main.py

Or test the weather function directly:

python tools/weather.py

Available Tools

`fetch_weather`

Retrieves current weather information for a specified location.

Parameters:

location (string): The city or location name (e.g., "London", "New York", "Tokyo")

Returns:

A string containing the weather information including temperature and conditions

Example Response:

London: ⛅️ +12°C

Project Structure

weather-mcp/
├── main.py              # MCP server entry point
├── tools/
│   ├── __init__.py
│   └── weather.py       # Weather fetching logic
├── pyproject.toml       # Project configuration
├── README.md            # This file
└── uv.lock             # Dependency lock file

Technical Details

MCP Framework: FastMCP
Weather API: wttr.in - a console-oriented weather service
Transport: stdio (standard input/output)
Python Version: 3.12+

How It Works

The server exposes a fetch_weather tool via the Model Context Protocol
When called, it makes an HTTP request to wttr.in's API
The weather data is formatted and returned to the MCP client
The AI assistant can then present this information naturally to the user

Troubleshooting

Server not appearing in Claude Desktop

Verify the path in your config file is absolute and correct
Restart Claude Desktop completely
Check the Claude Desktop logs for any error messages

Weather data not loading

Ensure you have an active internet connection
The wttr.in service must be accessible from your network
Some corporate networks may block access to external weather services

Acknowledgments

Built with FastMCP
Weather data provided by wttr.in

Made with ❤️ for the MCP community