Weather Intelligence is a hosted Model Context Protocol (MCP) server that gives Claude — and any MCP-compatible assistant — live access to U.S. weather data plus a probability layer built for high-stakes decisions. You connect it once; after that, you just ask weather questions in plain English and your assistant pulls real data and runs the analysis for you.
What it is · Connecting · The six tools · Tiers & pricing · Example prompts · Data & privacy
Weather Intelligence connects your AI assistant to the U.S. National Weather Service (api.weather.gov) and NOAA Climate Data Online — the same primary government sources professional forecasters use and that prediction-market weather contracts settle against. On top of that data, the Pro tier adds a Monte Carlo simulation engine that turns a single-point forecast into a full probability distribution: mean, percentiles (10/25/50/75/90), and tail risk.
It is built for people making money decisions on weather:
It is fully hosted on Cloudflare's edge — there is nothing to install or run yourself. Every request authenticates; there is no anonymous access.
You connect once. There are two supported methods: OAuth (recommended for Claude.ai — no key to copy or paste) and a Bearer API key (for Claude Desktop, Claude Code, and server-to-server clients). Both hit the same account system — your tier, daily quota, and metering are identical regardless of how you connect.
Best for Claude.ai web and desktop. No API key to manage; Claude walks you through a consent screen and handles tokens automatically.
https://weather-intelligence-mcp.quantrisk.workers.dev/mcpwx_ API key — do this to keep one account across devices or to use a paid tier.Note: each fresh "new account" consent creates a separate free key. To use a paid tier or share one account across clients, link your wx_ key on the consent page.
For server-to-server use and clients that connect with a static credential. Add this to your MCP configuration:
{
"mcpServers": {
"weather-intelligence": {
"type": "http",
"url": "https://weather-intelligence-mcp.quantrisk.workers.dev/mcp",
"headers": {
"Authorization": "Bearer wx_YOUR_API_KEY"
}
}
}
}Generic MCP clients: POST JSON-RPC to /mcp with Authorization: Bearer wx_YOUR_API_KEY and Accept: application/json, text/event-stream. No credential returns HTTP 401 with a sign-up message. Need a key? Contact hello@sixthrule.dev — or just use the OAuth method above, which provisions a free key for you.
You never call these directly — your assistant picks the right tool from your question. This is just so you know what's available. The first three are available on every tier; the last three require a paid tier as noted.
| Tool | What it does | Tier |
|---|---|---|
get_forecast |
The standard forecast for any U.S. location: 12-hour day/night periods out to 7 days — temperature, precipitation chance, wind, conditions. | All |
get_alerts |
Active NWS watches, warnings, and advisories for a U.S. state or a specific point — severe weather before the crew loads the truck. | All |
get_hourly_forecast |
Hour-by-hour forecast out to ~156 hours. This is how you find a dry 6-hour window or check overnight lows for a concrete pour. | All |
get_historical_patterns |
Past weather records — last 7 days from NWS, or 8 to 365 days back from NOAA Climate Data Online. "How hot was Phoenix last July 4th?" | Standard, Pro |
probability_distribution |
Monte Carlo simulation across forecast uncertainty. Returns the probability of a threshold event (e.g. high > 85°F) plus a full percentile breakdown (10/25/50/75/90) — the odds, not a point estimate. | Pro |
compare_locations |
Side-by-side forecast comparison across 2 to 8 sites at once — a multi-job-site morning brief, or several markets in one ask. | Pro |
If you ask a probability question on a tier that doesn't include it, your assistant answers from the basic forecast instead and tells you the advanced tool is a Pro feature — nothing breaks.
| Free | Standard | Pro | |
|---|---|---|---|
| Price | $0 | $19/mo Subscribe → | $49/mo Subscribe → |
| Daily quota | 10 calls/day (hard, resets 00:00 UTC) | Unlimited (fair-use 2,000/day) | Unlimited (fair-use 5,000/day) |
| Forecasts, hourly & alerts | ✓ | ✓ | ✓ |
| Historical patterns (NWS + NOAA) | — | ✓ | ✓ |
| Monte Carlo probability distributions | — | — | ✓ |
| Multi-site comparison (2–8) | — | — | ✓ |
| Best for | Trying it this week | Daily scheduling & planning | Trading & high-stakes calls |
Subscribing takes one click: checkout via Stripe, and your API key is shown immediately after payment (link it to your account on the OAuth consent page, or use it directly as a Bearer key). The free tier needs no credit card. When you hit 10 calls in a day, your assistant tells you and the counter resets at midnight UTC — nothing breaks and you lose nothing. One mispriced contract, or one saved crew day, covers Pro for months.
Tip: batch your asks. "Compare Tuesday, Wednesday, and Thursday in one answer" is cheaper against your quota than three separate questions.
Ask the way you'd ask a colleague. Your assistant figures out which tool to use.
Weather data is sourced from the U.S. National Weather Service / NOAA (api.weather.gov, NOAA Climate Data Online). NWS data is in the public domain and not subject to copyright protection (17 U.S.C. § 403). This product is not endorsed by or affiliated with NOAA or the NWS.
We collect as little as possible: your API key, its tier, OAuth client registrations and refresh tokens for connected apps, and a per-day log of tool calls (tool name, timestamp, allowed/denied) kept for billing and quota enforcement. Location parameters pass through to the weather providers to answer your request and are not retained; we never send your key or identity to the providers. Full details are in our Privacy Policy.
Support: hello@sixthrule.dev · we respond within one business day.