Post Daily AI Weather Bulletins on Facebook (n8n, Open-Meteo, GPT-4o)

Automatically post daily AI weather bulletins to your Facebook Page—twice a day

This n8n workflow pulls a 6-day forecast from Open-Meteo, uses GPT-4o to write a clear, structured weather bulletin, and then publishes it to your Facebook Page via the Facebook Graph API—scheduled for 08:00 and 18:00.

What this workflow does

• Runs on a twice-daily schedule (default cron: 0 8,18 * * *).
• Builds a city list containing each city’s name, latitude, and longitude.
• Requests a 6-day daily forecast for those locations from the Open-Meteo API.
• Condenses forecast data into a compact prompt and calls OpenAI GPT-4o to generate:
  • a headline
  • a synoptic overview
  • a city-by-city outlook
  • impacts and advice
• Retrieves available Facebook Pages for your connected account and obtains a page access token.
• Posts the generated bulletin to the feed of the first (or selected) Facebook Page using the Facebook Graph API.

Use cases

• Local organizations that need routine weather updates with consistent formatting.
• Media/SaaS teams using n8n + Open-Meteo + GPT-4o to automate content publishing.
• Operators who want forecast-driven posts without manual writing every morning and evening.

Technical details

• n8n nodes: Schedule Trigger, HTTP Request, Code, and (documentation) Sticky Note.
• Open-Meteo: fetches 6-day daily forecast data by latitude/longitude.
• OpenAI: Chat Completions request using model gpt-4o.
• Facebook Graph API: lists Pages and publishes posts (requires permissions such as pages_manage_posts and pages_read_engagement).

Setup is straightforward: update the Cities step, add your OpenAI credential, add Facebook Graph API credentials, and (if needed) target the correct Facebook Page ID.