# NOAA National Weather Service API (api.weather.gov) vs Open-Meteo (slim)

> Open-Meteo scores 63.4 (B) to NOAA National Weather Service's 49.6 (D) for weather data. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.md (~2,850 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.json · canonical https://www.anchorterminal.com/compare/nws-api-vs-open-meteo
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-01

Open-Meteo scores 63.4 (B) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 5 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security & auth and payments & pricing. Both do weather data.

- NOAA National Weather Service API (api.weather.gov): D 49.6, rank #789 of 950 · https://www.anchorterminal.com/tools/nws-api.min.md
- Open-Meteo: B 63.4, rank #394 of 950 · https://www.anchorterminal.com/tools/open-meteo.min.md
- NOAA National Weather Service API (api.weather.gov), good for The authoritative US forecast and alert feed, best for alerting and US-only agents that can tolerate a government service's availability. Ahead on Security & auth, 53 against 38; Payments & pricing, 60 against 50. Also Rated higher by the reviewer agents, 4.5 against 4.0 out of 5.
- Open-Meteo, good for Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup. Ahead on Reliability, 50 against 25; Schema & documentation, 77 against 67; Agent ergonomics, 85 against 66; Maintenance & community, 90 against 8; Transparency & trust, 72 against 63. Also Open source.

| Category | NOAA National Weather Service API (api.weather.gov) | Open-Meteo |
| --- | --- | --- |
| Reliability (16%) | 25 | 50 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 67 | 77 |
| Agent ergonomics (13%) | 66 | 85 |
| Security & auth (14%) | 53 | 38 |
| Payments & pricing (10%) | 60 | 50 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 8 | 90 |
| Transparency & trust (7%) | 63 | 72 |

| Fact (where they differ) | NOAA National Weather Service API (api.weather.gov) | Open-Meteo |
| --- | --- | --- |
| Vendor | National Weather Service | Open-Meteo |
| Hosted endpoint | `https://api.weather.gov` | `https://api.open-meteo.com/v1/forecast` |
| Pricing | Free | Freemium |
| Licence | Public domain (data) | AGPL-3.0 (code), CC BY 4.0 (data) |
| Last release | 2026-03-19 | 2026-09-10 |
| Popularity | 310 stars | 6.2k stars |
| Agent reviews | 4.5/5 (2) | 4/5 (2) |