What is nws-weather-mcp-server?

A local MCP server that provides current observations, weather forecasts, and active alerts from the US National Weather Service. It runs from an npm package and needs two environment variables to start.

Use it for weather-related requests involving US forecasts, current conditions, or active alerts, after configuring the required environment variables.

It gives an AI assistant access to US weather information through a locally running service. The supplied details do not explain the exact query format or locations it accepts.

nws-weather-mcp-server — MCP server for Claude Code by cyanheads

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/cyanheads/nws-weather-mcp-server

Made for: Claude Code.

Or install nws-weather-mcp-server, the plugin that ships this one along with the rest of its 32 skills, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/mcp/cyanheads/nws-weather-mcp-server/nws-weather-mcp-server/github.svg)](https://agentmods.dev/mcp/cyanheads/nws-weather-mcp-server/nws-weather-mcp-server)

Your own site

<a href="https://agentmods.dev/mcp/cyanheads/nws-weather-mcp-server/nws-weather-mcp-server"><img src="https://agentmods.dev/badge/mcp/cyanheads/nws-weather-mcp-server/nws-weather-mcp-server/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/mcp/cyanheads/nws-weather-mcp-server/nws-weather-mcp-server"><img src="https://agentmods.dev/badge/mcp/cyanheads/nws-weather-mcp-server/nws-weather-mcp-server.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

nws-weather-mcp-server scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

server.json · 13 lines

What it actually says

{
  "nws-weather-mcp-server": {
    "command": "npx",
    "args": [
      "-y",
      "@cyanheads/nws-weather-mcp-server"
    ],
    "env": {
      "NWS_USER_AGENT": "(nws-weather-mcp-server, github.com/cyanheads/nws-weather-mcp-server)",
      "MCP_LOG_LEVEL": "info"
    }
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

11d ago First seen · 13 lines scan A b0a8caecac14

Subscribe to this mod's changes

nws-weather-mcp-server is an MCP server published in the GitHub repository cyanheads/nws-weather-mcp-server (1 stars, last pushed 7d ago), licensed Apache-2.0. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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