Open-Meteo
api.open-meteo.com · Science
Free open-source weather API for non-commercial use. No API key required. Hourly forecasts, 16-day outlooks, 80 years of historical data, marine, air quality, and elevation APIs. Sub-10ms response times.
Authentication
No authentication requiredFree to use with no key needed.
Sample Requests
GET
Get weather forecast
Get 3-day hourly forecast for Berlin.
https://api.open-meteo.com/v1/forecast?hourly=temperature_2m,precipitation&latitude=52.52&longitude=13.41&forecast_days=3
Hover any highlighted part to learn what it does
curl -X GET "https://api.open-meteo.com/v1/forecast?hourly=temperature_2m%2Cprecipitation&latitude=52.52&longitude=13.41&forecast_days=3"
import requests
params = {
"hourly": "temperature_2m,precipitation",
"latitude": "52.52",
"longitude": "13.41",
"forecast_days": "3"
}
response = requests.get(
"https://api.open-meteo.com/v1/forecast",
params=params,
)
print(response.json())const url = new URL('https://api.open-meteo.com/v1/forecast');
url.searchParams.set('hourly', 'temperature_2m,precipitation');
url.searchParams.set('latitude', '52.52');
url.searchParams.set('longitude', '13.41');
url.searchParams.set('forecast_days', '3');
const response = await fetch(url);
const data = await response.json();
console.log(data);package main
import (
"fmt"
"io"
"net/http"
"net/url"
)
func main() {
baseURL, _ := url.Parse("https://api.open-meteo.com/v1/forecast")
q := baseURL.Query()
q.Set("hourly", "temperature_2m,precipitation")
q.Set("latitude", "52.52")
q.Set("longitude", "13.41")
q.Set("forecast_days", "3")
baseURL.RawQuery = q.Encode()
targetURL := baseURL.String()
req, _ := http.NewRequest("GET", targetURL, nil)
client := &http.Client{}
resp, _ := client.Do(req)
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}require "net/http"
require "json"
uri = URI("https://api.open-meteo.com/v1/forecast")
uri.query = URI.encode_www_form({
"hourly" => "temperature_2m,precipitation",
"latitude" => "52.52",
"longitude" => "13.41",
"forecast_days" => "3"
})
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"
req = Net::HTTP::Get.new(uri)
res = http.request(req)
puts JSON.parse(res.body)<?php
$url = "https://api.open-meteo.com/v1/forecast?" . http_build_query([
"hourly" => "temperature_2m,precipitation",
"latitude" => "52.52",
"longitude" => "13.41",
"forecast_days" => "3"
]);
$opts = ["http" => [
"method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));
GET
Get historical weather
Get historical daily weather for New York.
https://api.open-meteo.com/v1/archive?daily=temperature_2m_max,precipitation_sum&end_date=2024-01-07&latitude=40.71&longitude=-74.01&start_date=2024-01-01
Hover any highlighted part to learn what it does
curl -X GET "https://api.open-meteo.com/v1/archive?daily=temperature_2m_max%2Cprecipitation_sum&end_date=2024-01-07&latitude=40.71&longitude=-74.01&start_date=2024-01-01"
import requests
params = {
"daily": "temperature_2m_max,precipitation_sum",
"end_date": "2024-01-07",
"latitude": "40.71",
"longitude": "-74.01",
"start_date": "2024-01-01"
}
response = requests.get(
"https://api.open-meteo.com/v1/archive",
params=params,
)
print(response.json())const url = new URL('https://api.open-meteo.com/v1/archive');
url.searchParams.set('daily', 'temperature_2m_max,precipitation_sum');
url.searchParams.set('end_date', '2024-01-07');
url.searchParams.set('latitude', '40.71');
url.searchParams.set('longitude', '-74.01');
url.searchParams.set('start_date', '2024-01-01');
const response = await fetch(url);
const data = await response.json();
console.log(data);package main
import (
"fmt"
"io"
"net/http"
"net/url"
)
func main() {
baseURL, _ := url.Parse("https://api.open-meteo.com/v1/archive")
q := baseURL.Query()
q.Set("daily", "temperature_2m_max,precipitation_sum")
q.Set("end_date", "2024-01-07")
q.Set("latitude", "40.71")
q.Set("longitude", "-74.01")
q.Set("start_date", "2024-01-01")
baseURL.RawQuery = q.Encode()
targetURL := baseURL.String()
req, _ := http.NewRequest("GET", targetURL, nil)
client := &http.Client{}
resp, _ := client.Do(req)
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}require "net/http"
require "json"
uri = URI("https://api.open-meteo.com/v1/archive")
uri.query = URI.encode_www_form({
"daily" => "temperature_2m_max,precipitation_sum",
"end_date" => "2024-01-07",
"latitude" => "40.71",
"longitude" => "-74.01",
"start_date" => "2024-01-01"
})
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"
req = Net::HTTP::Get.new(uri)
res = http.request(req)
puts JSON.parse(res.body)<?php
$url = "https://api.open-meteo.com/v1/archive?" . http_build_query([
"daily" => "temperature_2m_max,precipitation_sum",
"end_date" => "2024-01-07",
"latitude" => "40.71",
"longitude" => "-74.01",
"start_date" => "2024-01-01"
]);
$opts = ["http" => [
"method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));Postman Setup Guide
- No API key needed
- Try GET https://api.open-meteo.com/v1/forecast?latitude=51.51&longitude=-0.13&hourly=temperature_2m&forecast_days=7
- Use latitude/longitude for any location worldwide
- Historical data: replace /forecast with /archive and add start_date/end_date params
What can you build with Open-Meteo?
Open-Meteo is a Science API. Developers commonly use science APIs for:
- accessing research datasets and scientific literature
- powering academic and R&D applications
- running scientific calculations and simulations
- visualising experimental and observational data
- integrating with research and reference databases
No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Open-Meteo is free to use, making it a low-risk choice to experiment with.
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