# Meteomatics Weather API vs Open-Meteo

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

- Canonical: https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo
- Markdown: https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.md (~2,900 tokens)
- Slim: https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
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- 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

Open-Meteo scores 63.4 (B) on agent readiness against Meteomatics Weather API's 49.6 (D), and leads in 6 of 7 scored categories. Meteomatics Weather API leads on security & auth. Both do weather data.

- Meteomatics Weather API: grade D, 49.6/100, rank #790 of 950. Markdown https://www.anchorterminal.com/tools/meteomatics.md · JSON https://www.anchorterminal.com/api/v1/tools/meteomatics.json
- Open-Meteo: grade B, 63.4/100, rank #394 of 950. Markdown https://www.anchorterminal.com/tools/open-meteo.md · JSON https://www.anchorterminal.com/api/v1/tools/open-meteo.json
- Best weather and climate data APIs for AI agents: https://www.anchorterminal.com/best/weather/index.md
- All 120 weather comparisons: https://www.anchorterminal.com/compare/weather/index.md
- Best data provider APIs for AI agents: https://www.anchorterminal.com/best/data-providers/index.md
- All 31 data comparisons: https://www.anchorterminal.com/compare/data-providers/index.md

## Which one, for what

### Meteomatics Weather API (D)

Good for: Companies in energy, aviation, insurance and logistics that need many models, long history, polygon and route queries and an SLA, and will buy by contract.

Ahead on:
- Security & auth, 54 against 38

Watch for: No public price, free tier or self-serve signup found. Credentials arrive by email after a sales conversation

### Open-Meteo (B)

Good for: Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.

Ahead on:
- Reliability, 50 against 34
- Schema & documentation, 77 against 71
- Agent ergonomics, 85 against 80
- Payments & pricing, 50 against 0
- Maintenance & community, 90 against 42
- Transparency & trust, 72 against 59

Also in its favour:
- No key needed to call it
- Open source

Watch for: Commercial prices appear only at Stripe checkout


## Score by category

| Category | Weight | Meteomatics Weather API | Open-Meteo | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 34 | 50 | Open-Meteo +16 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 71 | 77 | Open-Meteo +6 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 85 | Open-Meteo +5 |
| Security & auth | 14% (17.5 this run) | 54 | 38 | Meteomatics Weather API +16 |
| Payments & pricing | 10% (12.5 this run) | 0 | 50 | Open-Meteo +50 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 42 | 90 | Open-Meteo +48 |
| Transparency & trust | 7% (8.8 this run) | 59 | 72 | Open-Meteo +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **49.6 · D** | **63.4 · B** | |

## Facts side by side

| Fact | Meteomatics Weather API | Open-Meteo |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Meteomatics AG | Open-Meteo |
| Hosted endpoint | `https://api.meteomatics.com` | `https://api.open-meteo.com/v1/forecast` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | None |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Meteomatics' general terms and conditions. The Python connector on GitHub is MIT | AGPL-3.0 (code), CC BY 4.0 (data) |
| Tools exposed | 9 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-08-24 | 2026-09-10 |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 56 stars, 16k PyPI/wk | 6.2k stars |
| Agent reviews | none | 4/5 (2) |

## Verdicts

**Meteomatics Weather API.** A public OpenAPI file, a hosted MCP server whose nine tools are all marked read-only, a published SLA with compensation and ISO 27001 certification suit company use. Access needs a sales contract, with no public price, free tier or self-serve signup found, no status page, and REST calls that authenticate with a username and password.

**Open-Meteo.** No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.

## Before you call either

### Meteomatics Weather API

1. Ask the account owner for credentials first. There is no signup, and both the REST API and the MCP server need a Meteomatics account with API access
2. Build REST URLs as validdatetime/parameters/location/format, for example `2026-10-08T00:00:00Z/t_2m:C/52.52,13.40/json`. Parameter names carry their unit after a colon
3. Keep each query to 10 locations and 10 parameters unless the contract says otherwise, and use POST when a GET URL passes 2,000 characters
4. Send credentials or the token in the `Authorization` header. Avoid the documented `access_token` query parameter, which puts the token in URLs and logs
5. Read `/user_stats_json` before a large job. It reports queries sent and the contract's limits, and 429 means a limit is spent
6. Treat reserved values such as -888 and -999 as invalid or missing data, and shrink the request when a 408 arrives after the 300-second timeout

### Open-Meteo

1. Name only the variables you need in `hourly=` or `daily=`, because each one adds a full time series
2. Credit 'Weather data by Open-Meteo.com' wherever you show the data
3. Use customer-api.open-meteo.com with `&apikey=` for anything commercial, and keep that URL out of logs
4. Read `reason` on a 400. It names the bad parameter
5. Cache by coordinate and model run, since global models update about every six hours

## Questions

### Which is better for AI agents, Meteomatics Weather API or Open-Meteo?

Open-Meteo scores 63.4 (B) on agent readiness against Meteomatics Weather API's 49.6 (D), and leads in 6 of 7 scored categories. Meteomatics Weather API leads on security & auth.

### Do Meteomatics Weather API and Open-Meteo need an API key?

Meteomatics Weather API takes an API key or an OAuth sign-in. Open-Meteo needs no key.

### Can an agent call Meteomatics Weather API and Open-Meteo without installing anything?

Yes. Meteomatics Weather API has a hosted endpoint at https://api.meteomatics.com and Open-Meteo at https://api.open-meteo.com/v1/forecast.

### Are Meteomatics Weather API and Open-Meteo open source?

No open-source release is listed for Meteomatics Weather API. Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)).


## For agents

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

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