7Timer! API

⭐ Beginner's Pick Weather / No Auth Required Beginner HTTP
Free to Use Varies (check documentation)

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.

Available Data

temperature
weather conditions
humidity
wind speed
forecast data

Example Response

JSON Response
{
  "location": "Tokyo",
  "temperature": {
    "current": 22,
    "feels_like": 24,
    "min": 18,
    "max": 26
  },
  "condition": "Partly Cloudy",
  "humidity": 65,
  "wind": {
    "speed": 12,
    "direction": "NE"
  },
  "forecast": [
    {
      "date": "2025-01-16",
      "high": 25,
      "low": 17,
      "condition": "Sunny"
    }
  ]
}

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.
dataseries[].timepoint Hours from the init time for this particular forecast step.
dataseries[].cloudcover Cloud cover index on a scale from 1 (clear) to 9 (overcast).
dataseries[].temp2m Temperature at 2 meters above ground in degrees Celsius.

Implementation Example

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

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.

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 20/20
🔒 Security 0/15
🛠 Developer XP 15/20
✓ Reliability 7/15
Response Time 192ms

Fully tested on Apr 5, 2026

Technical Specifications

Auth No Auth
HTTPS NO
CORS UNKNOWN
Category Weather
Difficulty Beginner
Verified: 2026-04-04

Alternatives to 7Timer!

Technical alternatives for different use cases.

Simple astronomical and weather forecast, no auth required

Better For

Detailed current conditions and historical data

Trade-off

Astronomy-related weather forecasts

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