# Met Office Weather DataHub (Site Specific) vs Tomorrow.io Weather API

> Tomorrow.io Weather API scores 51.4 (D) on agent readiness against Met Office Weather DataHub (Site Specific)'s 45.5 (E), and leads in 5 of 7 scored categories. Met Office Weather DataHub (Site Specific) leads on security & auth and payments & pricing. Both do weather current.…

- Canonical: https://www.anchorterminal.com/compare/met-office-datahub-vs-tomorrow-io
- Markdown: https://www.anchorterminal.com/compare/met-office-datahub-vs-tomorrow-io.md (~2,850 tokens)
- Slim: https://www.anchorterminal.com/compare/met-office-datahub-vs-tomorrow-io.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/met-office-datahub-vs-tomorrow-io.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

Tomorrow.io Weather API scores 51.4 (D) on agent readiness against Met Office Weather DataHub (Site Specific)'s 45.5 (E), and leads in 5 of 7 scored categories. Met Office Weather DataHub (Site Specific) leads on security & auth and payments & pricing. Both do weather current.

- Met Office Weather DataHub (Site Specific): grade E, 45.5/100, rank #656 of 722. Markdown https://www.anchorterminal.com/tools/met-office-datahub.md · JSON https://www.anchorterminal.com/api/v1/tools/met-office-datahub.json
- 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

## Which one, for what

### Met Office Weather DataHub (Site Specific) (E)

Good for: Best when a UK answer has to come from the national weather service, and when the licence to republish matters.

Ahead on:
- Security & auth, 66 against 34
- Payments & pricing, 30 against 20

Also in its favour:
- Free to start without a card

Watch for: No OpenAPI, llms.txt, SDK or MCP server

### 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:
- Reliability, 55 against 48
- Schema & documentation, 75 against 32
- Agent ergonomics, 73 against 53
- Maintenance & community, 27 against 15

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


## Score by category

| Category | Weight | Met Office Weather DataHub (Site Specific) | Tomorrow.io Weather API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 48 | 55 | Tomorrow.io Weather API +7 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 32 | 75 | Tomorrow.io Weather API +43 |
| Agent ergonomics | 13% (16.2 this run) | 53 | 73 | Tomorrow.io Weather API +20 |
| Security & auth | 14% (17.5 this run) | 66 | 34 | Met Office Weather DataHub (Site Specific) +32 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | Met Office Weather DataHub (Site Specific) +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 15 | 27 | Tomorrow.io Weather API +12 |
| Transparency & trust | 7% (8.8 this run) | 62 | 63 | Tomorrow.io Weather API +1 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **45.5 · E** | **51.4 · D** | |

## Facts side by side

| Fact | Met Office Weather DataHub (Site Specific) | Tomorrow.io Weather API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Met Office | The Tomorrow Companies Inc. |
| Hosted endpoint | `https://data.hub.api.metoffice.gov.uk/sitespecific/v0/point` | `https://api.tomorrow.io/v4` |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | BSD-3-Clause (utilities) | Proprietary service under Tomorrow.io's subscription terms |
| Tools exposed | none | 11 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | none | 2026-07-14 |
| Terms last updated | couldn't be read | couldn't be read |
| Privacy policy last updated | 2024-04-03 | couldn't be read |
| Customer content may train models | couldn't be read | couldn't be read |
| Terms restrict automated access | couldn't be read | couldn't be read |
| Terms restrict benchmarking | couldn't be read | couldn't be read |
| Terms or service can change without notice | couldn't be read | couldn't be read |
| Arbitration or class-action waiver | couldn't be read | couldn't be read |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**Met Office Weather DataHub (Site Specific).** Statutory UK weather service, with a FAQ licence to copy, publish and adapt the data. No OpenAPI, llms.txt, SDK or MCP server.

**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.

## Before you call either

### Met Office Weather DataHub (Site Specific)

1. Register an application and subscribe it to the Global Spot plan first. The key is tied to that order and shown once
2. Send the key in the apikey header with Accept: application/json, and latitude and longitude as query parameters
3. Add excludeParameterMetadata=true to drop the parameter descriptions from every response
4. Pick the timestep by need. hourly covers 48 hours, three-hourly 168, daily 7 days, and each call counts against the daily limit
5. Stop on a 429. The limit is daily and resets at 00:00 UTC

### 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

## Questions

### Which is better for AI agents, Met Office Weather DataHub (Site Specific) or Tomorrow.io Weather API?

Tomorrow.io Weather API scores 51.4 (D) on agent readiness against Met Office Weather DataHub (Site Specific)'s 45.5 (E), and leads in 5 of 7 scored categories. Met Office Weather DataHub (Site Specific) leads on security & auth and payments & pricing.

### Do Met Office Weather DataHub (Site Specific) and Tomorrow.io Weather API need an API key?

Met Office Weather DataHub (Site Specific) needs an API key. Tomorrow.io Weather API takes an API key or an OAuth sign-in.

### Can an agent call Met Office Weather DataHub (Site Specific) and Tomorrow.io Weather API without installing anything?

Yes. Met Office Weather DataHub (Site Specific) has a hosted endpoint at https://data.hub.api.metoffice.gov.uk/sitespecific/v0/point and Tomorrow.io Weather API at https://api.tomorrow.io/v4.


## For agents

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

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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)
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