7Timer! API

Beginner's Pick Weather / No Auth Required Beginner HTTP
Free to Use
34 F
Measured Score 0 50 100 Speed 10/30 Consistency 20/20 Security 0/20 Browser access 0/15 Transparency 4/15 TESTED 2026-08-10

Overview

7Timer! is a free weather forecast API originally built for astronomers who need clear-sky predictions. It provides multi-day forecasts including cloud cover, wind, seeing conditions, and more for any latitude and longitude on Earth. No API key or registration is required, making it one of the easiest weather APIs to start using.

Beginner Tip

Provide lat and lon as decimal coordinates and choose a product like ASTRO for astronomy or CIVIL for general weather; the API returns XML or JSON depending on the output parameter you set. Because no authentication is needed, you can test your first request directly in a browser.

Measurement Record

What actually happened when we called this API from our own infrastructure. Every value below was recorded by the request, not copied from the provider's documentation.

Request
GET http://www.7timer.info/bin/api.pl?lon=-0.1278&lat=51.5074&product=civil&output=json
Result
HTTP 200 · text/plain · 15,122 bytes · compressed
Response time
317 ms (median of 3) · fastest 310 ms
Browser CORS
No Access-Control-Allow-Origin header — call it from a server, not the browser
Served by
Apache/2.4.68 (Debian)
Recorded
2026-08-10

Fields Returned

Top-level fields present in the response we captured, with the type and value we actually received.

Field Type Value received
product string civil
init string 2026081012
dataseries array [1 item]

Captured Response

Captured from a real request to http://www.7timer.info/bin/api.pl?lon=-0.1278&lat=51.5074&product=civil&output=json on 2026-08-10. Long arrays and nested objects are truncated to keep the shape readable.

JSON Response · Captured
{
  "product": "civil",
  "init": "2026081012",
  "dataseries": [
    {
      "timepoint": 3,
      "cloudcover": 9,
      "lifted_index": 10,
      "prec_type": "none",
      "prec_amount": 0,
      "temp2m": 26,
      "rh2m": "33%",
      "wind10m": {
        "…": "(2 more fields)"
      },
      "weather": "cloudyday"
    }
  ]
}

Field Reference

product The forecast product type requested, such as civil or astro.
init The initialization time of the forecast model in UTC format.
dataseries Array of forecast time steps, each covering a 3-hour interval.

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

Request
const url = "http://www.7timer.info/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.

Empty or malformed response The coordinates are out of range or formatted incorrectly.
Ensure lat is between -90 and 90 and lon is between -180 and 180, using decimal notation (e.g., 48.85).
HTTP error or no response The API uses HTTP only and the server may occasionally be slow.
Retry the request; avoid using HTTPS as the endpoint does not support it.
Unexpected product values The product parameter is set to an unrecognized value.
Use one of the documented products: ASTRO, CIVIL, CIVILLIGHT, METEO, or TWO.

Measured Score Breakdown

Live HTTP request to the API endpoint

Speed 10/30
Consistency 20/20
Security 0/20
Browser access 0/15
Transparency 4/15
Endpoint Response Time 317ms

Fully tested on Aug 10, 2026

Technical Specifications

Auth No Auth
HTTPS NO
CORS UNKNOWN
Category Weather
Difficulty Beginner
Endpoint last called: 2026-08-10

Related Tags

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