Japan Weather Forecast Archive (JMA, as issued) MCP Server

by mk-career-planning Your server? Claim it

answering

Japan Weather Forecast Archive (JMA, as issued) is answering right now. Last checked 5 min ago. It exposes 4 tools.

What did Japan's weather agency forecast, as issued at a past time? Archive of JMA bulletins.

Uptime history 8 days of history

8 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

1141 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Japan Weather Forecast Archive (JMA, as issued) every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add jp-forecast-archive --transport http https://jp-forecast-archive-production.mk-career-planning.workers.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://jp-forecast-archive-production.mk-career-planning.workers.dev/mcp

~/.codex/config.toml

[mcp_servers.jp-forecast-archive]
url = "https://jp-forecast-archive-production.mk-career-planning.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "jp-forecast-archive": {
      "url": "https://jp-forecast-archive-production.mk-career-planning.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "jp-forecast-archive": {
      "type": "http",
      "url": "https://jp-forecast-archive-production.mk-career-planning.workers.dev/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

forecast

forecast_as_issued

Archived JMA prefectural weather forecast as issued. Give an area and at (forecast in effect then) or issued_at (exact JMA issue time). Returns JMA's bulletin as published (Japanese weather text, wind, waves, 6-hour rain probability, temperatures) with report_datetime (JMA's issue time) apart from fetched_at (ours). Status found, not_archived (before this archive started), unknown or no_issuance_at_that_time. Not the current forecast: check JMA.

forecast_issuances

Which prefectural weather forecasts did JMA issue for an area between two times? Lists each archived issuance (JMA issue time, transmission time, our fetch time, scheduled/unscheduled/correction/cancellation, bulletin URL and SHA-256) with coverage gaps where JMA's feed could not be read. Free window: last 30 days (an earlier since is clamped; see history_window). Use forecast_as_issued for the content. An archive, not a forecast service.

catalog

catalog

List the tools of this server with prices, data sources, licensing, daily limits and data freshness.

receipt

get_receipt

Re-fetch the stored result of a settled paid call by its receipt_id, for when the response was lost after payment. Free. Unknown or unsettled receipt ids return RECEIPT_NOT_FOUND. Results are kept for 90 days after settlement.

Endpoints

URL	Transport	State	Latency	Checked
https://jp-forecast-archive-production.mk-career-planning.workers.dev/mcp	streamable-http	answering	1262 ms	5 min ago

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Japan Weather Forecast Archive (JMA, as issued) — questions

Answers built from our own checks of this server.

What can Japan Weather Forecast Archive (JMA, as issued) do?

It exposes 4 tools, read directly from the server on our last check. Among them: catalog, forecast_as_issued, forecast_issuances, get_receipt. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Japan Weather Forecast Archive (JMA, as issued) working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 1141 ms. The bar chart above shows every period we have measured.

How do I connect Japan Weather Forecast Archive (JMA, as issued)?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Japan Weather Forecast Archive (JMA, as issued) need an API key?

No. Japan Weather Forecast Archive (JMA, as issued) completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Japan Weather Forecast Archive (JMA, as issued)?

It answers our handshake in 1141 ms on average, which is faster than 3% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.