Open-Meteo API

Base URL

https://api.open-meteo.com/v1

Authentication

No API key. Non-commercial and commercial use are both allowed below roughly 10,000 requests per day; above that Open-Meteo asks you to buy an API plan.

Rate limit

Approximately 10,000 requests per day per IP on the free tier.

Pricing

Free, including commercial use, under the daily limit. Paid plans lift the cap.

CORS

Enabled — callable directly from browser JavaScript

Official docs

Read the docs

Every request below was executed against the live API on 19 Aug 2026, and the response shown is the real body it returned — not an illustration.

curl 'https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&current=temperature_2m,wind_speed_10m'

const res = await fetch("https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&current=temperature_2m,wind_speed_10m");
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

import requests

res = requests.get("https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&current=temperature_2m,wind_speed_10m", timeout=20)
res.raise_for_status()
print(res.json())

{
  "latitude": 52.52,
  "longitude": 13.419998,
  "generationtime_ms": 0.07152557373046875,
  "utc_offset_seconds": 0,
  "timezone": "GMT",
  "timezone_abbreviation": "GMT",
  "elevation": 38.0,
  "current_units": {
    "time": "iso8601",
    "interval": "seconds",
    "temperature_2m": "°C",
    "wind_speed_10m": "km/h"
  },
  "current": {
    "time": "2026-08-19T13:00",
    "interval": 900,
    "temperature_2m": 19.0,
    "wind_speed_10m": 8.8
  }
}

latitude / longitudefloat

The grid point actually used, which is snapped to the model grid and so differs slightly from what you requested.

timezonestring

Resolved timezone name for the returned timestamps.

currentobject

Object holding one key per variable you requested, plus a `time` stamp.

current_unitsobject

The unit string for each variable in `current` — read this rather than assuming Celsius.

elevationfloat

Elevation in metres of the model grid cell, useful for sanity-checking mountain forecasts.

• Show a live weather widget on a dashboard or homepage without managing an API key
• Build a 7-day forecast screen in a mobile or web app
• Trigger automations from weather conditions, such as irrigation or delivery scheduling
• Backfill weather context into analytics using the companion historical archive API
• Teach HTTP and JSON parsing in a classroom, where handing out API keys is impractical

If Open-Meteo does not fit, these weather apis cover similar ground. Every one was called before publishing, and each links to its own reference page with a working curl command and the response it returned.