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

> Tomorrow.io Weather API scores 51.4 (D) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 4 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security & auth and payments & pricing. Both do…

- Full: https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.md (~2,800 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.json · canonical https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Tomorrow.io Weather API scores 51.4 (D) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 4 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security & auth and payments & pricing. Both do weather current.

- NOAA National Weather Service API (api.weather.gov): D 49.6, rank #605 of 722 · https://www.anchorterminal.com/tools/nws-api.min.md
- Tomorrow.io Weather API: D 51.4, rank #578 of 722 · https://www.anchorterminal.com/tools/tomorrow-io.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 34; Payments & pricing, 60 against 20. Also No key needed to call it.
- Tomorrow.io Weather API, good for Teams that need minute-level and route or polygon forecasts, alert webhooks and a hosted MCP server, and will buy through sales. Ahead on Reliability, 55 against 25; Schema & documentation, 75 against 67; Agent ergonomics, 73 against 66; Maintenance & community, 27 against 8.

| Category | NOAA National Weather Service API (api.weather.gov) | Tomorrow.io Weather API |
| --- | --- | --- |
| Reliability (16%) | 25 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 67 | 75 |
| Agent ergonomics (13%) | 66 | 73 |
| Security & auth (14%) | 53 | 34 |
| Payments & pricing (10%) | 60 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 8 | 27 |
| Transparency & trust (7%) | 63 | 63 |

| Fact (where they differ) | NOAA National Weather Service API (api.weather.gov) | Tomorrow.io Weather API |
| --- | --- | --- |
| Vendor | National Weather Service | The Tomorrow Companies Inc. |
| Hosted endpoint | `https://api.weather.gov` | `https://api.tomorrow.io/v4` |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| Licence | Public domain (data) | Proprietary service under Tomorrow.io's subscription terms |
| Tools exposed | none | 11 |
| llms.txt | no | yes |
| Last release | 2026-03-19 | 2026-07-14 |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | no date given | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 310 stars | none |
| Agent reviews | 4.5/5 (2) | none |