# Japan Weather Forecast (JMA) (`grinning_naiad_h0w/jp-weather-forecast`) Actor

Fetch Japan Meteorological Agency forecasts for a JMA area code as structured rows with weather, wind, waves, precipitation probability, temperatures, and report time.

- **URL**: https://apify.com/grinning_naiad_h0w/jp-weather-forecast.md
- **Developed by:** [JP Open Data](https://apify.com/grinning_naiad_h0w) (community)
- **Categories:** Travel, Developer tools
- **Features:** Limited permissions
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

Pay per usage

This Actor is paid per platform usage. The Actor is free to use, and you only pay for the Apify platform usage, which gets cheaper the higher subscription plan you have.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-usage

## What's an Apify Actor?

An Actor is a serverless cloud program that runs on the Apify platform. It has two run modes.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.

Apify vocabulary and the platform model are defined once, in the agent quickstart at https://apify.com/agents.md.

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For examples already wired to this Actor's own input schema, see the [API](#api) section below.

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).

# README

## Japan Weather Forecast API (JMA)

Live Japan weather forecasts from the official Japan Meteorological Agency public API.

Use this Actor to turn JMA forecast area codes into clean dataset rows with forecast time, area name, weather text, weather code, wind, wave height, probability of precipitation, and min/max temperatures.

### Why use it

- Official JMA forecast data in structured JSON rows.
- Works well for AI agents, dashboards, travel tools, logistics workflows, and local apps.
- Covers Japanese forecast areas by JMA area code.
- No browser scraping or proxy required.

### Common use cases

- Daily weather automation for Japan locations.
- Travel, hotel, event, and logistics planning workflows.
- Weather widgets and internal dashboards.
- AI agents that need current Japanese weather data.

### Input

| Field | Type | Description |
|---|---|---|
| `areaCode` | string | JMA forecast area code. Tokyo: `130000`, Osaka: `270000`, Sapporo/Hokkaido: `016000`. |
| `limitDays` | integer | Maximum forecast time periods per area. Default `3`, max `7`. |

```json
{ "areaCode": "130000", "limitDays": 3 }
```

### Output

One dataset row per forecast area and forecast time:

| Field | Meaning |
|---|---|
| `area_code` | Requested JMA forecast area code |
| `detail_area_code` | JMA sub-area code |
| `area_name` | Forecast sub-area name |
| `forecast_time` | Forecast time |
| `weather` / `weather_code` | Forecast text and JMA weather code |
| `wind` / `wave` | Wind and wave forecast text |
| `probability_of_precipitation` | Precipitation probability when available |
| `temp_min_c` / `temp_max_c` | Minimum and maximum temperature in Celsius when available |
| `publishing_office` | JMA publishing office |
| `report_datetime` | JMA report timestamp |

### Source

Data source: Japan Meteorological Agency public forecast API. This Actor is not affiliated with or endorsed by JMA.

Keywords: Japan weather API, JMA weather, 気象庁 天気予報, Japanese forecast API, Tokyo weather, Osaka weather, Japan travel weather, weather automation.

# Actor input Schema

## `areaCode` (type: `string`):

JMA forecast area code. Tokyo is 130000, Osaka is 270000, Hokkaido/Sapporo is 016000.

## `limitDays` (type: `integer`):

Maximum number of forecast time periods per area.

## Actor input object example

```json
{
  "areaCode": "130000",
  "limitDays": 3
}
```

# Actor output Schema

## `forecasts` (type: `string`):

Japan weather forecasts from the official JMA API

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "areaCode": "130000"
};

// Run the Actor and wait for it to finish
const run = await client.actor("grinning_naiad_h0w/jp-weather-forecast").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "areaCode": "130000" }

# Run the Actor and wait for it to finish
run = client.actor("grinning_naiad_h0w/jp-weather-forecast").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "areaCode": "130000"
}' |
apify call grinning_naiad_h0w/jp-weather-forecast --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,grinning_naiad_h0w/jp-weather-forecast"
        }
    }
}
```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/qqtwX0o4jv978Z238/builds/eBXm6t0UofJl7pQeo/openapi.json