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Weather MCP Server

Give your AI assistant real weather data — 17 tools, zero API keys, zero signup, zero cost.

Weather MCP is a Model Context Protocol server that connects AI assistants (Claude, Cursor, Cline, Zed, and any other MCP client) to live weather data: forecasts, current conditions, alerts, air quality, marine conditions, lightning, radar, rivers, wildfires, and 85+ years of historical weather. It's built entirely on free public data sources — NOAA, Open-Meteo, MET Norway, USGS, NIFC, NASA FIRMS, RainViewer, and Blitzortung.org — so there is nothing to sign up for and no key to paste in. (A few optional keys unlock extras — see Optional API keys — but no tool ever requires one.)

claude mcp add weather -- npx -y @dangahagan/weather-mcp@latest

That's the whole install for Claude Code. For any other MCP client, add this to its MCP config:

{
  "mcpServers": {
    "weather": {
      "command": "npx",
      "args": ["-y", "@dangahagan/weather-mcp@latest"]
    }
  }
}

Then just ask:

"What's the weather in Tokyo this weekend?" "Is there any lightning near the lake right now?" "How does today compare to normal for this time of year?" "Are there wildfires within 50 miles of my cabin?" "Will there be a full moon this weekend?" "Is this a record high for today?" "How bad is the pollen in Berlin today?" "What was the weather in Paris on June 6, 1944?"

👉 See it in action — real prompts like these with the answers they produced, and the raw server output behind them.

📦 Listed in the Official MCP Registry as io.github.dgahagan/weather-mcp.

✅ The official package is @dangahagan/weather-mcp, published from this repository via npm trusted publishing. Every release carries a signed provenance attestation tying the tarball to the exact commit and workflow that built it — verify any version without installing it:

npm view @dangahagan/weather-mcp@latest dist.attestations

Republished copies of this server exist under other npm scopes. They are MIT-licensed forks, which the license permits, but they are not maintained here and are usually many versions behind. This issue tracker covers @dangahagan/weather-mcp only — for anything installed from another scope, please report it to that package's publisher.

Why this server?

There are excellent commercial weather MCPs backed by paid APIs and full-time teams. If you need SLA-backed data, minute-level nowcasting, or premium global station coverage, they're worth a look — this project won't pretend otherwise.

Choose this one if you want:

• Genuinely free — every data source is a free public API. No trial that expires, no credit card, no rate-limited "free tier" bait.
• No API keys — install to first forecast in under a minute. Nothing to configure, nothing to leak into a repo. (Four optional keys add extras if you want them; the default configuration needs none.)
• Fully open source — MIT licensed, readable TypeScript, 4,800 tests. Audit it, fork it, fix it.
• Privacy-respecting — your queries go directly from your machine to public weather APIs. No middleman server, and no telemetry unless you opt in.
• Breadth — 17 tools covering weather, safety hazards (lightning, floods, wildfires), marine conditions, air quality, and historical data back to 1940. Most weather MCPs stop at forecasts.

The tradeoff is honest: US data (NOAA) is richer than international data (Open-Meteo), some tools are US-only, and free APIs come with fair-use rate limits. See Coverage & Limitations.

Tools

All 17 tools, documented in detail in docs/TOOLS.md:…