Koskamo

Japan Weather Forecast MCP

Provides JMA short-term weather forecasts by prefecture for AI agents. Supports free tier for single prefecture forecasts and paid tiers for overview text, batch processing, and unlimited usage via subscription or pay-per-call.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Japan Weather Forecast MCP logo, by Donnie MorrisonCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-01Published by Donnie Morrison
MCP endpoint (Streamable HTTP)
https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp
Vendor documentation

What you can do with it

  • Retrieve JMA short-term weather forecast for a specific prefecture
  • Get JMA textual overview forecast for a prefecture
  • Fetch forecasts for up to 8 prefectures in a batch

Source and maintenance

Community listingRegistry 1.0.0
mcp-registry: io.github.donniertf-hub/jp-weather-forecast-mcp@1.0.0Source repositoryProject website
Maintenance checked

Protocol and capabilities

Server
jp-weather-forecast-mcp 1.0.0
MCP protocol
2025-06-18
Tools
3 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Japan Weather Forecast. forecast is free. Subscribe (¥1200/month, cancel anytime) at https://jp-weather-forecast-mcp.donniertf.workers.dev/buy for the paid tools, then pass access_token.

Tools

3 advertised

forecast
Advertised by the server during the last successful anonymous check.

FREE. JMA short-term weather forecast for a prefecture (default Tokyo).

forecast input schema
{
  "type": "object",
  "properties": {
    "prefecture": {
      "type": "string"
    }
  }
}
overview
Advertised by the server during the last successful anonymous check.

PRO. JMA textual overview forecast for a prefecture.

overview input schema
{
  "type": "object",
  "required": [
    "prefecture"
  ],
  "properties": {
    "prefecture": {
      "type": "string"
    },
    "access_token": {
      "type": "string",
      "description": "Subscriber token from /success (or Authorization: Bearer)"
    }
  }
}
batch_forecast
Advertised by the server during the last successful anonymous check.

PRO. Forecasts for up to 8 prefectures.

batch_forecast input schema
{
  "type": "object",
  "required": [
    "prefectures"
  ],
  "properties": {
    "prefectures": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "access_token": {
      "type": "string",
      "description": "Subscriber token from /success (or Authorization: Bearer)"
    }
  }
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
403 ms
95th percentile latency
403 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 403 ms · metadata changed · 3 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http japan-weather-forecast-mcp https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add japan-weather-forecast-mcp --url https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable japan-weather-forecast-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "japan-weather-forecast-mcp": {
      "url": "https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "japan-weather-forecast-mcp": {
      "type": "streamableHttp",
      "url": "https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start japan-weather-forecast-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "japan-weather-forecast-mcp": {
      "type": "http",
      "url": "https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http japan-weather-forecast-mcp https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "japan-weather-forecast-mcp": {
      "url": "https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "japan-weather-forecast-mcp": {
      "serverUrl": "https://jp-weather-forecast-mcp.donniertf.workers.dev/mcp"
    }
  }
}

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