Open-Meteo

Open-Meteo is an open-source weather data API that serves forecasts and related environmental datasets via a simple HTTP JSON interface. It aggregates and processes numerical weather prediction data from multiple national weather services and can be run as your own API instance.

Key Features

• Hourly weather forecasts for up to 16 days
• Historical weather data spanning decades (hourly, global coverage)
• Multiple model sources and intelligent selection depending on location and region
• Additional APIs such as marine weather, air quality, geocoding, elevation, and flood-related data
• High-performance responses designed for low-latency use
• No API key required for the public non-commercial endpoint; CORS supported
• Container-friendly deployment options for running private instances

Use Cases

• Powering weather features in mobile apps, websites, and dashboards
• Data pipelines and analytics using historical climate and weather time series
• Feeding forecasting, automation, or smart home workflows with reliable hourly weather inputs

Limitations and Considerations

• Public API usage is intended for fair-use and non-commercial scenarios; higher-volume and commercial use may require a subscription
• Data coverage, resolution, and update frequency vary by underlying regional and global models

Open-Meteo is well-suited for developers who want a transparent, auditable weather backend with a straightforward JSON API. It is especially useful when you need reproducible processing and the option to operate your own infrastructure for scale or specialized workloads.