# Tomorrow.io Weather API vs The Weather Company Data APIs

> The Weather Company Data APIs scores 52.6 (D) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 3 of 7 scored categories. Tomorrow.io Weather API leads on schema & documentation, agent ergonomics and transparency & trust. Both do weather current.…

- Canonical: https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company
- Markdown: https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company.md (~2,800 tokens)
- Slim: https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

The Weather Company Data APIs scores 52.6 (D) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 3 of 7 scored categories. Tomorrow.io Weather API leads on schema & documentation, agent ergonomics and transparency & trust. Both do weather current.

- Tomorrow.io Weather API: grade D, 51.4/100, rank #578 of 722. Markdown https://www.anchorterminal.com/tools/tomorrow-io.md · JSON https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json
- The Weather Company Data APIs: grade D, 52.6/100, rank #565 of 722. Markdown https://www.anchorterminal.com/tools/weather-company.md · JSON https://www.anchorterminal.com/api/v1/tools/weather-company.json

## Which one, for what

### Tomorrow.io Weather API (D)

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:
- Schema & documentation, 75 against 67
- Agent ergonomics, 73 against 54
- Transparency & trust, 63 against 49

Watch for: No public price for paid use. The plan table lists Free and Enterprise, the second by quote

### The Weather Company Data APIs (D)

Good for: A business that wants one contract for global forecasts, 4 km current conditions, alerts, imagery, aviation and deep history, and that can go through sales.

Ahead on:
- Reliability, 73 against 55
- Security & auth, 48 against 34
- Maintenance & community, 36 against 27

Watch for: No self-serve signup. The trial is requested through a form, is limited to enterprise customers, and the Buy now button opens a contact form.


## Score by category

| Category | Weight | Tomorrow.io Weather API | The Weather Company Data APIs | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 73 | The Weather Company Data APIs +18 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 75 | 67 | Tomorrow.io Weather API +8 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 54 | Tomorrow.io Weather API +19 |
| Security & auth | 14% (17.5 this run) | 34 | 48 | The Weather Company Data APIs +14 |
| Payments & pricing | 10% (12.5 this run) | 20 | 20 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 27 | 36 | The Weather Company Data APIs +9 |
| Transparency & trust | 7% (8.8 this run) | 63 | 49 | Tomorrow.io Weather API +14 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **51.4 · D** | **52.6 · D** | |

## Facts side by side

| Fact | Tomorrow.io Weather API | The Weather Company Data APIs |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | The Tomorrow Companies Inc. | The Weather Company, LLC |
| Hosted endpoint | `https://api.tomorrow.io/v4` | `https://api.weather.com` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary service under Tomorrow.io's subscription terms | Proprietary service. Use is under a content licensing agreement with The Weather Company, which is not published |
| Tools exposed | 11 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-07-14 | 2026-09-14 |
| Terms last updated | couldn't be read | no document linked |
| Privacy policy last updated | couldn't be read | couldn't be read |
| Customer content may train models | couldn't be read |  |
| Terms restrict automated access | couldn't be read |  |
| Terms restrict benchmarking | couldn't be read |  |
| Terms or service can change without notice | couldn't be read |  |
| Arbitration or class-action waiver | couldn't be read |  |

## Verdicts

**Tomorrow.io Weather API.** A public OpenAPI 3.1 file, Markdown docs with llms.txt and a hosted MCP server with 11 tools suit agents, and a free plan exists. Paid prices are by quote only, free keys are barred from commercial use, the docs give no numeric rate limits, and the status page lists 50 incidents in 85 days, mostly stale or degraded data.

**The Weather Company Data APIs.** A wide weather data API with 168 API references built from OpenAPI documents, global 4 km current conditions, hourly history from June 2015 and a status page with component history. Keys come only through a sales-reviewed trial or contract, travel only in the URL, and the terms that govern the API are not published.

## Before you call either

### Tomorrow.io Weather API

1. Send the key in the `apikey` header, not the query string, so it stays out of URLs and logs
2. Request only the `fields` and `timesteps` needed on POST /timelines. Free plans cover 24 hours back and 5 days ahead at `1h` and `1d`
3. Split archive requests. POST /historical takes at most 31 days per call and deducts tokens, 1 for a point and 10 for a polygon
4. Treat 401 with code 401001 as a missing or bad key. The docs say 403, the live API answered 401 on 8 October 2026
5. On 429 back off without a hint. `Retry-After` is documented only for 503
6. Check the plan's terms before storing or reselling responses. Free accounts are limited to non-commercial use with a Powered by Tomorrow.io link

### The Weather Company Data APIs

1. Send `units`, `language` and `format=json` with a location on every v3 call, plus `Accept-Encoding: gzip`, which the usage guide marks as required.
2. Keep the key out of logs and client-side code, because it travels in the query string as `apiKey`.
3. Treat a 401 as either a bad key, an endpoint outside the key's package or an exceeded limit, and treat a 204 as no data for the query.
4. Each forecast duration (`3day` to `15day`) is a separate entitlement. Request only durations the contract covers.
5. Use `/v3/aggcommon` to combine up to 10 products in one request. Each product and each location still counts as one call.

## Questions

### Which is better for AI agents, Tomorrow.io Weather API or The Weather Company Data APIs?

The Weather Company Data APIs scores 52.6 (D) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 3 of 7 scored categories. Tomorrow.io Weather API leads on schema & documentation, agent ergonomics and transparency & trust.

### Do Tomorrow.io Weather API and The Weather Company Data APIs need an API key?

Tomorrow.io Weather API takes an API key or an OAuth sign-in. The Weather Company Data APIs needs an API key.

### Can an agent call Tomorrow.io Weather API and The Weather Company Data APIs without installing anything?

Yes. Tomorrow.io Weather API has a hosted endpoint at https://api.tomorrow.io/v4 and The Weather Company Data APIs at https://api.weather.com.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company.json, and with the fewest tokens: https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "tomorrow-io", "b": "weather-company"}`. From a terminal: `anchor compare tomorrow-io weather-company`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json and https://www.anchorterminal.com/api/v1/tools/weather-company.json

## Other comparisons with Tomorrow.io Weather API or The Weather Company Data APIs

- [AccuWeather Core Weather API + MCP vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/accuweather-api-vs-tomorrow-io.md)
- [AccuWeather Core Weather API + MCP vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/accuweather-api-vs-weather-company.md)
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- [NOAA National Weather Service API (api.weather.gov) vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.md)
- [NOAA National Weather Service API (api.weather.gov) vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/nws-api-vs-weather-company.md)
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