# meteoblue Weather API vs Stormglass API

> meteoblue Weather scores 61.7 (C) to Stormglass's 39.9 (E) for weather forecasts. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/meteoblue-vs-stormglass
- Markdown: https://www.anchorterminal.com/compare/meteoblue-vs-stormglass.md (~2,850 tokens)
- Slim: https://www.anchorterminal.com/compare/meteoblue-vs-stormglass.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/meteoblue-vs-stormglass.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: 2026-10-09

meteoblue Weather API scores 61.7 (C) on agent readiness against Stormglass API's 39.9 (E), and leads in every scored category. Both do weather forecasts.

- meteoblue Weather API: grade C, 61.7/100, rank #460 of 950. Markdown https://www.anchorterminal.com/tools/meteoblue.md · JSON https://www.anchorterminal.com/api/v1/tools/meteoblue.json
- Stormglass API: grade E, 39.9/100, rank #914 of 950. Markdown https://www.anchorterminal.com/tools/stormglass.md · JSON https://www.anchorterminal.com/api/v1/tools/stormglass.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

## Which one, for what

### meteoblue Weather API (C)

Good for: Energy, agriculture and marine applications that need solar, wind, soil, sea or ensemble variables at a point, with history back to 1940 on a paid plan.

Ahead on:
- Reliability, 75 against 34
- Schema & documentation, 77 against 40
- Security & auth, 51 against 44
- Payments & pricing, 34 against 25
- Maintenance & community, 57 against 15
- Transparency & trust, 61 against 45

Watch for: The key is accepted only as the `apikey` query parameter, so it appears in URLs and logs unless request signing is switched on

### Stormglass API (E)

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.

Watch for: No OpenAPI file, llms.txt, official SDK or changelog was found. The docs are eleven Markdown pages


## Score by category

| Category | Weight | meteoblue Weather API | Stormglass API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 34 | meteoblue Weather API +41 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 40 | meteoblue Weather API +37 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 65 | meteoblue Weather API +1 |
| Security & auth | 14% (17.5 this run) | 51 | 44 | meteoblue Weather API +7 |
| Payments & pricing | 10% (12.5 this run) | 34 | 25 | meteoblue Weather API +9 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 57 | 15 | meteoblue Weather API +42 |
| Transparency & trust | 7% (8.8 this run) | 61 | 45 | meteoblue Weather API +16 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **61.7 · C** | **39.9 · E** | |

## Facts side by side

| Fact | meteoblue Weather API | Stormglass API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | meteoblue AG | Storm Glass AB |
| Hosted endpoint | `https://my.meteoblue.com` | `https://api.stormglass.io/v2` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary service under meteoblue's general terms and conditions. The Python SDK for the Dataset API is MIT | Proprietary service under Storm Glass AB's Terms and Conditions. The Free and Small plans are not for commercial use |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-08-22 | 2026-02-26 |
| Terms last updated | 2018-05-24 | no date given |
| Privacy policy last updated | 2024-05-15 | 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 | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 8 stars, 512 PyPI/wk | none |

## Verdicts

**meteoblue Weather API.** Eight of the APIs publish OpenAPI 3.1 specs, and the Forecast API spec lists the credit cost of every package. A public Pingdom page shows monthly uptime per API. The key travels only in the query string, the free trial covers nine forecast packages, and no security.txt, certification or DPA was found.

**Stormglass API.** A read-only weather and marine API with about 70 hourly parameters, per-source values from named national models, tide data and ERA5 history from 2014. No OpenAPI file, status page, SDK or security page was found, the free plan allows 10 requests a day, and the docs and FAQ disagree on the status code for a spent quota.

## Before you call either

### meteoblue Weather API

1. Pass `lat`, `lon` and `apikey` to `https://my.meteoblue.com/packages/<package>`. Join packages with commas, such as `basic-1h,basic-day`, to get several in one call
2. Budget credits before calling. One call costs 4,000 to 96,000 credits by package, and the free trial holds 10 million for a year. Read `MB-Credits-Accounted` on each response
3. Set `forecastDays` and pick the coarsest resolution that does the job. Without it the API returns every forecast day it has
4. Call with a 30-second timeout, wait 30 seconds after an error and stop after 10 retries, as the availability page advises. The default limit is 500 calls a minute
5. Keep the key out of logs, since it is part of every URL. Ask for a shared secret and send `expire` and `sig` if URLs may be seen by others

### Stormglass API

1. Send the key as `Authorization: KEY` with no Bearer prefix. A missing or wrong key returns 403 with `{"errors":{"key":"API key is invalid"}}`
2. Always pass `source=sg` or a short source list on `/weather/point`. The default is every source, which multiplies the size of each hourly record
3. Treat 402 as a spent daily quota, not a billing failure, and stop until the next day. Read `meta.requestCount` against `meta.dailyQuota` on each response
4. Use `/historical/point` for past dates, at most 10 days a call and nothing newer than about 7 days. `/weather/point` looks back 14 days only
5. Send and read all times in UTC. Tide sea levels are relative to the chosen datum (MSL by default) and are not water depth

## Questions

### Which is better for AI agents, meteoblue Weather API or Stormglass API?

meteoblue Weather API scores 61.7 (C) on agent readiness against Stormglass API's 39.9 (E), and leads in every scored category.

### Do meteoblue Weather API and Stormglass API need an API key?

Both need an API key.

### Can an agent call meteoblue Weather API and Stormglass API without installing anything?

Yes. meteoblue Weather API has a hosted endpoint at https://my.meteoblue.com and Stormglass API at https://api.stormglass.io/v2.


## For agents

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

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- [AccuWeather Core Weather API + MCP vs meteoblue Weather API](https://www.anchorterminal.com/compare/accuweather-api-vs-meteoblue.md)
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- [meteoblue Weather API vs Open-Meteo](https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo.md)
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- [NOAA National Weather Service API (api.weather.gov) vs Stormglass API](https://www.anchorterminal.com/compare/nws-api-vs-stormglass.md)
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