Japan Weather Forecast Archive (JMA, as issued)

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io.github.mk-career-planning/jp-forecast-archivev0.1.0

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

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

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Tools (4)

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

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No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

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.

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Argument	Type	Description
at	string	ISO 8601 date-time with time zone: return the issuance in effect at this time, e.g. 2026-10-12T09:00:00+09:00
area*	string	JMA forecast office code (130000), sub-area code (130010), prefecture (Tokyo, 東京都, 13) or JMA area name (Kushiro Nemuro). Prefectures with several offices (Hokkaido, Kagoshima, Okinawa) need the office or sub-area
issued_at	string	ISO 8601 date-time with time zone: return the issuance with exactly this JMA issue time, e.g. 2026-10-12T05:00:00+09:00

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "area"
  ],
  "properties": {
    "at": {
      "type": "string",
      "maxLength": 40,
      "description": "ISO 8601 date-time with time zone: return the issuance in effect at this time, e.g. 2026-10-12T09:00:00+09:00"
    },
    "area": {
      "type": "string",
      "maxLength": 40,
      "description": "JMA forecast office code (130000), sub-area code (130010), prefecture (Tokyo, 東京都, 13) or JMA area name (Kushiro Nemuro). Prefectures with several offices (Hokkaido, Kagoshima, Okinawa) need the office or sub-area"
    },
    "issued_at": {
      "type": "string",
      "maxLength": 40,
      "description": "ISO 8601 date-time with time zone: return the issuance with exactly this JMA issue time, e.g. 2026-10-12T05:00:00+09:00"
    }
  }
}

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.

read-only

Argument	Type	Description
area*	string	JMA forecast office code (130000), sub-area code (130010), prefecture (Tokyo, 東京都, 13) or JMA area name (Kushiro Nemuro). Prefectures with several offices (Hokkaido, Kagoshima, Okinawa) need the office or sub-area
limit	integer	Maximum number of issuances, 1-500 (default 100)
since*	string	Issuances after this: ISO 8601 date (00:00 Japan time) or date-time with time zone, e.g. 2026-10-12 or 2026-10-12T05:00:00+09:00
until	string	Optional end: ISO 8601 date (00:00 Japan time) or date-time with time zone (default now)

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "area",
    "since"
  ],
  "properties": {
    "area": {
      "type": "string",
      "maxLength": 40,
      "description": "JMA forecast office code (130000), sub-area code (130010), prefecture (Tokyo, 東京都, 13) or JMA area name (Kushiro Nemuro). Prefectures with several offices (Hokkaido, Kagoshima, Okinawa) need the office or sub-area"
    },
    "limit": {
      "type": "integer",
      "maximum": 500,
      "minimum": 1,
      "description": "Maximum number of issuances, 1-500 (default 100)"
    },
    "since": {
      "type": "string",
      "maxLength": 40,
      "description": "Issuances after this: ISO 8601 date (00:00 Japan time) or date-time with time zone, e.g. 2026-10-12 or 2026-10-12T05:00:00+09:00"
    },
    "until": {
      "type": "string",
      "maxLength": 40,
      "description": "Optional end: ISO 8601 date (00:00 Japan time) or date-time with time zone (default now)"
    }
  }
}

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.

read-only

Argument	Type	Description
receipt_id*	string	The receipt_id returned with a paid result ("rcpt_" + 64 hex characters).

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "receipt_id"
  ],
  "properties": {
    "receipt_id": {
      "type": "string",
      "maxLength": 80,
      "minLength": 1,
      "description": "The receipt_id returned with a paid result (\"rcpt_\" + 64 hex characters)."
    }
  }
}