Automated Indonesian Weather Alerts with BMKG Data & Telegram Notifications

This n8n workflow automates the process of fetching weather data from the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) and sending alerts via Telegram if specific weather conditions are met.

What it does

This workflow simplifies monitoring weather conditions in Indonesia and provides timely notifications, making it useful for individuals or businesses that need to stay informed about local weather changes.

1. Triggers on a Schedule: The workflow is set to run at regular intervals (e.g., every hour, daily).
2. Fetches Weather Data: It makes an HTTP request to the BMKG API to retrieve the latest weather forecast data for a specified region.
3. Processes Data: A Code node processes the raw JSON response from BMKG, extracting relevant weather information.
4. Checks for Conditions: An If node evaluates the extracted weather data against predefined conditions (e.g., specific weather types, temperatures).
5. Sends Telegram Alert: If the conditions are met, a message is formatted and sent to a specified Telegram chat.

Prerequisites/Requirements

• n8n Instance: A running n8n instance.
• Telegram Bot Token: A Telegram Bot token to send messages. You can create one by talking to BotFather on Telegram.
• Telegram Chat ID: The chat ID where the notifications should be sent. This can be a personal chat, a group, or a channel.
• BMKG API Endpoint: The specific BMKG API endpoint for the region you wish to monitor. (This will need to be configured in the HTTP Request node).

Setup/Usage

1. Import the Workflow:
   • Save the provided JSON content as a .json file.
   • In your n8n instance, click "New" in the workflows list, then "Import from JSON" and upload the file.
2. Configure Credentials:
   • Telegram:
     • Locate the "Telegram" node.
     • Click on the "Credential" field and select "Create New".
     • Enter your Telegram Bot Token.
     • Save the credential.
3. Configure Nodes:
   • HTTP Request (Node ID 19):
     • Update the URL to the specific BMKG API endpoint for your desired region.
     • Adjust any headers or authentication if required by the BMKG API (though typically public weather APIs don't require complex auth).
   • Code (Node ID 834):
     • Review the JavaScript code to understand how it processes the BMKG data. You might need to adjust the parsing logic based on the exact structure of the BMKG API response you are using.
     • Ensure the code extracts the specific weather conditions you want to check.
   • If (Node ID 20):
     • Define your desired weather conditions. For example, you might check if weather_type contains "Hujan" (Rain), or if temperature is below a certain value.
     • The conditions should reference the data output by the preceding Code node.
   • Telegram (Node ID 49):
     • Enter the Chat ID where you want to receive the alerts.
     • Customize the Text field to create your alert message, using expressions to include dynamic weather data from previous nodes (e.g., {{ $json.weather_description }} or {{ $json.temperature }}°C).
4. Set the Schedule:
   • Schedule Trigger (Node ID 839):
     • Configure the desired interval for the workflow to run (e.g., every 1 hour, every day at 08:00 AM).
   • (Optional) Manual Trigger (Node ID 838): Use this node to manually test the workflow immediately. You can disable the Schedule Trigger during testing.
5. Activate the Workflow: Once configured, activate the workflow to start receiving automated weather alerts.