Automated Trip Weather Forecasts from Google Calendar to Telegram

This n8n workflow automates the process of sending weather forecasts for upcoming trips directly to your Telegram chat, based on events in your Google Calendar. It helps you stay prepared for your travels by providing timely weather information without manual checks.

What it does

1. Monitors Google Calendar: Triggers daily to check for upcoming events in a specified Google Calendar.
2. Filters Events: Identifies events that are marked as "trips" and occur within the next 7 days.
3. Extracts Location: Uses a Code node to parse the event description for location details.
4. Fetches Weather Data: Makes an HTTP request to a weather API (e.g., OpenWeatherMap, WeatherAPI.com) to get a 7-day forecast for the extracted location.
5. Formats Weather Message: Structures the weather forecast into a readable message.
6. Delays Message (Optional): Can introduce a delay before sending the message, if configured.
7. Sends Telegram Message: Posts the formatted weather forecast to a designated Telegram chat.

Prerequisites/Requirements

• n8n Instance: A running instance of n8n.
• Google Calendar Account: Authenticated Google Calendar credentials in n8n.
• Telegram Account: Authenticated Telegram credentials in n8n.
• Weather API Key: An API key for a weather service (e.g., OpenWeatherMap, WeatherAPI.com, AccuWeather). You will need to configure the HTTP Request node with the appropriate API endpoint and your key.

Setup/Usage

1. Import the Workflow: Import the provided JSON into your n8n instance.
2. Configure Google Calendar Trigger:
   • Select your Google Calendar credential.
   • Specify the calendar you want to monitor for trip events.
   • Adjust the "Look Back" and "Future Events" settings as needed (e.g., to check for events in the next 7 days).
3. Configure "If" Node:
   • Modify the conditions to identify "trip" events based on your calendar event naming conventions (e.g., checking the event summary or description for keywords like "trip", "travel", or a specific tag).
4. Configure "Code" Node:
   • The existing Code node is a placeholder. You will need to customize the JavaScript code to extract the location from your Google Calendar event descriptions. For example, if your event descriptions always contain "Location: [City, Country]", you would write code to parse that string.
5. Configure "HTTP Request" Node:
   • Method: GET
   • URL: Enter the endpoint for your chosen weather API. This URL will likely include parameters for latitude, longitude, and your API key. You will need to dynamically insert the location obtained from the previous "Code" node.
     • Example (OpenWeatherMap): https://api.openweathermap.org/data/2.5/onecall?lat={{$json.lat}}&lon={{$json.lon}}&exclude=minutely,hourly&appid={{YOUR_API_KEY}}&units=metric
     • Note: You might need an additional step (e.g., another HTTP Request or Code node) to convert a city name into latitude/longitude coordinates if your weather API requires them.
   • Headers/Query Parameters: Add any necessary headers or query parameters for authentication or specific data requests.
6. Configure "Telegram" Node:
   • Select your Telegram credential.
   • Specify the Chat ID where you want to receive the forecasts.
   • Customize the Text field to format the weather forecast message using expressions to pull data from the "HTTP Request" node's output.
7. Activate the Workflow: Once all nodes are configured, activate the workflow to start receiving automated weather forecasts.