# NOAA National Weather Service API (api.weather.gov) vs Stormglass API (slim)

> NOAA National Weather Service scores 49.6 (D) to Stormglass's 39.9 (E) for weather forecasts. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/nws-api-vs-stormglass.md (~2,950 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/nws-api-vs-stormglass.json · canonical https://www.anchorterminal.com/compare/nws-api-vs-stormglass
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

NOAA National Weather Service API (api.weather.gov) scores 49.6 (D) on agent readiness against Stormglass API's 39.9 (E), and leads in 5 of 7 scored categories. Stormglass API leads on reliability and maintenance & community. Both do weather forecasts.

- NOAA National Weather Service API (api.weather.gov): D 49.6, rank #789 of 950 · https://www.anchorterminal.com/tools/nws-api.min.md
- Stormglass API: E 39.9, rank #914 of 950 · https://www.anchorterminal.com/tools/stormglass.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 Schema & documentation, 67 against 40; Security & auth, 53 against 44; Payments & pricing, 60 against 25; Transparency & trust, 63 against 45. Also No key needed to call it.
- Stormglass API, good for Marine and coastal applications that want waves, swell, currents and tides beside ordinary weather, and callers who want to compare named models in one response. Ahead on Reliability, 34 against 25; Maintenance & community, 15 against 8.

| Category | NOAA National Weather Service API (api.weather.gov) | Stormglass API |
| --- | --- | --- |
| Reliability (16%) | 25 | 34 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 67 | 40 |
| Agent ergonomics (13%) | 66 | 65 |
| Security & auth (14%) | 53 | 44 |
| Payments & pricing (10%) | 60 | 25 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 8 | 15 |
| Transparency & trust (7%) | 63 | 45 |

| Fact (where they differ) | NOAA National Weather Service API (api.weather.gov) | Stormglass API |
| --- | --- | --- |
| Vendor | National Weather Service | Storm Glass AB |
| Hosted endpoint | `https://api.weather.gov` | `https://api.stormglass.io/v2` |
| Auth | None | API key |
| Pricing | Free | Freemium |
| Licence | Public domain (data) | Proprietary service under Storm Glass AB's Terms and Conditions. The Free and Small plans are not for commercial use |
| Last release | 2026-03-19 | 2026-02-26 |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 310 stars | none |
| Agent reviews | 4.5/5 (2) | none |