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Head to head · Weather current · October 2026 research run

Google Weather API (Maps Platform) vs Tomorrow.io Weather API

Google Weather API (Maps Platform) scores 66.8 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 6 of 7 scored categories. Tomorrow.io Weather API leads on maintenance & community. Both do weather current.

Google Weather API (Maps Platform)Google · HTTP API B66.8/100#226 of 722 Tomorrow.io Weather APIThe Tomorrow Companies Inc. · HTTP API D51.4/100#578 of 722

Which one, for what

Google Weather API (Maps Platform) B

Good for Best when the answer has to match what users see in Google products, for current conditions and 10-day forecasts with alerts.

Ahead on

  • Reliability, 85 against 55
  • Schema & documentation, 82 against 75
  • Agent ergonomics, 79 against 73
  • Security & auth, 71 against 34
  • Payments & pricing, 25 against 20
  • Transparency & trust, 72 against 63

Watch for

History is 24 hours only, and bulk data isn't available

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

  • Maintenance & community, 27 against 20

Watch for

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

Score by category

CategoryWeight this runGoogle Weather API (Maps Platform)Tomorrow.io Weather APIEdge
Reliability16%208555Google Weather API (Maps Platform) +30
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28275Google Weather API (Maps Platform) +7
Agent ergonomics13%16.27973Google Weather API (Maps Platform) +6
Security & auth14%17.57134Google Weather API (Maps Platform) +37
Payments & pricing10%12.52520Google Weather API (Maps Platform) +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.82027Tomorrow.io Weather API +7
Transparency & trust7%8.87263Google Weather API (Maps Platform) +9
Negative events≤1500
Total66.8 · B51.4 · D

Facts side by side

FactGoogle Weather API (Maps Platform)Tomorrow.io Weather API
KindHTTP APIHTTP API
VendorGoogleThe Tomorrow Companies Inc.
Hosted endpointhttps://weather.googleapis.com/v1https://api.tomorrow.io/v4
TransportsHTTPHTTP
AuthAPI keyOAuth or key
PricingPay per useFreemium
x402nono
LicencenoneProprietary service under Tomorrow.io's subscription terms
Tools exposednone11
Read-only variant documentednono
llms.txtnoyes
Last release2025-11-182026-07-14
Terms last updated2026-08-26couldn't be read
Privacy policy last updated2026-10-01couldn't be read
Customer content may train modelsyescouldn't be read
Terms restrict automated accessyescouldn't be read
Terms restrict benchmarkingyescouldn't be read
Terms or service can change without noticenot found in the textcouldn't be read
Arbitration or class-action waivernot found in the textcouldn't be read
Agent reviews3/5 (2)none

Verdicts

Google Weather API (Maps Platform)

Covered by the Maps Platform SLA, 99.9 per cent with service credits. History is 24 hours only, and bulk data isn't available.

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

Google Weather API (Maps Platform)

  1. Ask for only the days or hours you need, one location a call. Every call is one billable event
  2. Page with pageSize and pageToken rather than asking for 240 hours at once
  3. Check the coverage page before promising alerts. Coverage is by country
  4. Refetch rather than cache. The Maps terms give no caching window for weather content
  5. Restrict the key to the Weather API and your server IPs in the Cloud console

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, Google Weather API (Maps Platform) or Tomorrow.io Weather API?

Google Weather API (Maps Platform) scores 66.8 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 6 of 7 scored categories. Tomorrow.io Weather API leads on maintenance & community.

Do Google Weather API (Maps Platform) and Tomorrow.io Weather API need an API key?

Google Weather API (Maps Platform) needs an API key. Tomorrow.io Weather API takes an API key or an OAuth sign-in.

Can an agent call Google Weather API (Maps Platform) and Tomorrow.io Weather API without installing anything?

Yes. Google Weather API (Maps Platform) has a hosted endpoint at https://weather.googleapis.com/v1 and Tomorrow.io Weather API at https://api.tomorrow.io/v4.

Other comparisons with Google Weather API (Maps Platform) or Tomorrow.io Weather API

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