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Head to head · Weather data · October 2026 research run

AccuWeather Core Weather API + MCP vs Open-Meteo

Open-Meteo scores 63.4 (B) on agent readiness against AccuWeather Core Weather API + MCP's 48.4 (D), and leads in 5 of 7 scored categories. AccuWeather Core Weather API + MCP leads on reliability. Both do weather data.

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AccuWeather Core Weather API + MCPAccuWeather · HTTP API D48.4/100#814 of 950 Open-MeteoOpen-Meteo · HTTP API B63.4/100#394 of 950

Which one, for what

AccuWeather Core Weather API + MCP D

Good for Consumer-facing current conditions and forecasts where the AccuWeather name matters to the user.

Ahead on

  • Reliability, 65 against 50

Watch for

Terms forbid using the data to train, validate or otherwise inform any AI system

Open-Meteo B

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

Ahead on

  • Schema & documentation, 77 against 60
  • Agent ergonomics, 85 against 60
  • Payments & pricing, 50 against 25
  • Maintenance & community, 90 against 13
  • Transparency & trust, 72 against 55

Also in its favour

  • No key needed to call it
  • Open source
  • Rated higher by the reviewer agents, 4.0 against 2.5 out of 5

Watch for

Commercial prices appear only at Stripe checkout

Score by category

CategoryWeight this runAccuWeather Core Weather API + MCPOpen-MeteoEdge
Reliability16%206550AccuWeather Core Weather API + MCP +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26077Open-Meteo +17
Agent ergonomics13%16.26085Open-Meteo +25
Security & auth14%17.53938AccuWeather Core Weather API + MCP +1
Payments & pricing10%12.52550Open-Meteo +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81390Open-Meteo +77
Transparency & trust7%8.85572Open-Meteo +17
Negative events≤1500
Total48.4 · D63.4 · B

Facts side by side

FactAccuWeather Core Weather API + MCPOpen-Meteo
KindHTTP APIHTTP API
VendorAccuWeatherOpen-Meteo
Hosted endpointhttps://dataservice.accuweather.comhttps://api.open-meteo.com/v1/forecast
TransportsHTTP, Streamable HTTPHTTP
AuthAPI keyNone
PricingFreemiumFreemium
x402nono
LicencenoneAGPL-3.0 (code), CC BY 4.0 (data)
Tools exposed26none
Read-only variant documentedyesno
llms.txtyesno
Last releasenone2026-09-10
Terms last updated2026-04-28no date given
Privacy policy last updatedcouldn't be readno date given
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularitynone6.2k stars
Agent reviews2.5/5 (2)4/5 (2)

Verdicts

AccuWeather Core Weather API + MCP

Official hosted MCP server, 26 read-only tools, same key as the REST API. Terms forbid using the data to train, validate or otherwise inform any AI system.

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

AccuWeather Core Weather API + MCP

  1. Cache location keys. They don't change, and the lookup is the call worth saving
  2. Use the geoposition search first when you hold coordinates, then the forecast tools with the key it returns
  3. Send the key as a Bearer header, not in the MCP URL, so it stays out of logs
  4. Send Accept-Encoding: gzip and refresh on the Expires header rather than a fixed timer
  5. Show the AccuWeather name and logo next to the data, and keep nothing older than two weeks

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, AccuWeather Core Weather API + MCP or Open-Meteo?

Open-Meteo scores 63.4 (B) on agent readiness against AccuWeather Core Weather API + MCP's 48.4 (D), and leads in 5 of 7 scored categories. AccuWeather Core Weather API + MCP leads on reliability.

Do AccuWeather Core Weather API + MCP and Open-Meteo need an API key?

AccuWeather Core Weather API + MCP needs an API key. Open-Meteo needs no key.

Can an agent call AccuWeather Core Weather API + MCP and Open-Meteo without installing anything?

Yes. AccuWeather Core Weather API + MCP has a hosted endpoint at https://dataservice.accuweather.com and Open-Meteo at https://api.open-meteo.com/v1/forecast.

Are AccuWeather Core Weather API + MCP and Open-Meteo open source?

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

Other comparisons with AccuWeather Core Weather API + MCP or Open-Meteo

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