Japan Weather Forecast

Official JMA short-term forecasts by prefecture — structured time series for your AI agent.

For travel, events, retail and Japan-focused agents. Free: one prefecture forecast. Pro: overview text and batch.

Tools

• forecast (free) — FREE. JMA short-term weather forecast for a prefecture (default Tokyo).
• overview (Pro) — PRO. JMA textual overview forecast for a prefecture.
• batch_forecast (Pro) — PRO. Forecasts for up to 8 prefectures.

Live free example

forecast {"prefecture":"Osaka"}

{
  "office_code": "270000",
  "publishingOffice": "大阪管区気象台",
  "reportDatetime": "2026-10-16T17:00:00+09:00",
  "timeSeries": [
    {
      "timeDefines": [
        "2026-10-16T17:00:00+09:00",
        "2026-10-17T00:00:00+09:00",
        "2026-10-18T00:00:00+09:00"
      ],
      "areas": [
        {
          "area": {
            "name": "大阪府",
            "code": "270000"
          },
          "weatherCodes": [
            "211",
            "100",
            "101"
          ],
          "weathers": [
            "くもり　夜遅く　晴れ",
            "晴れ",
            "晴れ　時々　くもり"
          ],
          "winds": [
            "西の風　後　北東の風",
            "北東の風　海上　では　後　北東の風　やや強く",
            "東の風"
          ],
          "waves": [
            "０．５メートル",
            "０．５メートル　後　１メートル",
            "０．５メートル　後　１メートル"
          ]
        }
      ]
    },
    {
      "timeDefines": [
        "2026-10-16T18:00:00+09:00",
        "2026-10-17T00:00:00+09:00",
        "2026-10-17T06:00:00+09:00",
        "2026-10-17T12:00:00+09:00",
        "2026-10-17T18:00:00+09:00"
      ],
      "areas": [
        {
          "area": {
            "name": "大阪府",
            "code": "270000"
          },
          "pops": [
            "0",
            "0",
            "0",
            "0",
            "0"
          ]
        }
      ]
    }
  ],
  "pro": "Overview text, week view helpers, multi-prefecture batch: https://jp-weather-forecast-mcp.donniertf.workers.dev/buy",
  "disclaimer": "Short-term forecasts from the Japan Meteorological Agency bosai API by prefecture office code."
}

Connect (MCP)

Add https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp to Claude, Cursor or any MCP client (Streamable HTTP, no login for the free tier). Subscribers pass access_token or Authorization: Bearer.

Important

Short-term forecasts from the Japan Meteorological Agency bosai API by prefecture office code.

Data sources & licences

• Japan Meteorological Agency bosai forecast feed

For AI agents

llms.txt · server card · pricing.json · POST /checkout → checkout URL · GET /token?session_id= → access token.

More Japan data MCPs

Save with Japan bundles: jp-mcp-bundles · GitHub hub.

Contact & cancelling

Questions, refunds or cancelling: dmorrisonwebdesign@gmail.com. Run by Donnie Morrison, UK. Payments by Stripe; we never see card details.