7Timer! API
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
Example 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
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
Related Tags
Alternatives to 7Timer!
Technical alternatives for different use cases.
Simple astronomical and weather forecast, no auth required
Detailed current conditions and historical data
Astronomy-related weather forecasts
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