Weather · head-to-head
IPMA vs Open-Meteo
IPMA's open-data service is a plain directory of continuously-refreshed static JSON files, not just a single forecast endpoint: it covers daily/hourly weather forecasts, real-time station observations, sea-area and district warnings for mainland Portugal, the Azores and Madeira, plus separate seismic and biology (pollen) datasets from the same institute. No registration is required, though IPMA asks heavy users to email its webmaster for usage statistics.
Open-Meteo is an open-source weather API that blends forecast and historical data from national weather services like NOAA, DWD, and Meteo-France, automatically selecting the highest-resolution model available for a given location. It requires no API key for non-commercial use and covers specialized domains including marine conditions, air quality, flood risk, and long-range climate projections.
| IPMA | Open-Meteo | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | freemium |
| Formats | JSON | JSON, CSV, XLSX, FlatBuffers |
| CORS | yes | yes |
| HTTPS | Yes | Yes |
Open-Meteo supports 4 response formats, while IPMA offers fewer — pick Open-Meteo for more integration flexibility.