Weather · head-to-head
7Timer! vs IPMA
7Timer! generates numerical weather forecasts from NOAA/NCEP's Global Forecast System across roughly 1.5 million global grid points, refreshed four times daily. Beyond standard meteorological fields (cloud cover, temperature, wind, precipitation), it produces astronomy-specific products like "astro seeing" and atmospheric transparency for stargazing/observation planning, with forecast ranges from 3 days (ASTRO) up to a 9-16 day overview product.
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.
| 7Timer! | IPMA | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | JSON, XML, PNG | JSON |
| CORS | no | yes |
| HTTPS | No | Yes |
IPMA supports CORS, while 7Timer! doesn't — pick IPMA for direct browser calls.