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Aare.guru API vs Weather Underground API

Same instrument, two spec sheets — measured, not claimed.

APIAare.guru APIHEALTHY88Weather Underground APIREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1025104
P95 · ms29931117
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Aare.guru API vs Weather Underground API: common questions

Which is more reliable, Aare.guru API or Weather Underground API?

Both are neck-and-neck — Aare.guru API and Weather Underground API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Aare.guru API or Weather Underground API?

Weather Underground API has the lower median latency in our checks — Aare.guru API responds in 1025 ms versus Weather Underground API at 104 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Aare.guru API and Weather Underground API need an API key?

Aare.guru API needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for Aare.guru API first.

Can I call Aare.guru API and Weather Underground API from the browser?

Yes — both Aare.guru API and Weather Underground API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Aare.guru API and Weather Underground API free for commercial use?

Aare.guru API has unclear commercial terms, and Weather Underground API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.