wttr.in — Free Curl-Friendly Weather API (No Key)

TL;DR

wttr.in is the internet's most curl-friendly weather service. Get current conditions, forecasts, and astronomy data for any location worldwide. Output in multiple formats: JSON (?format=j1), plain text (great for terminals), PNG images (for embedding), and ANSI-colored text (for terminal use). Accessible via browser, curl, or any HTTP client. No API key required.

Quick start: https://wttr.in/London?format=j1

No API key needed — free weather for any location!

How to Use This API

1. Get Weather as JSON

Returns full weather data for any city in JSON format:

https://wttr.in/London?format=j1

2. Get Weather in Terminal (Plain Text)

curl wttr.in/Tokyo

3. Weather by GPS Coordinates

https://wttr.in/48.85,2.35?format=j1

4. JavaScript — Display Temperature

fetch('https://wttr.in/Paris?format=j1')
  .then(r => r.json())
  .then(data => {
    const current = data.current_condition[0];
    console.log(`Paris: ${current.temp_C}°C, ${current.weatherDesc[0].value}`);
    console.log(`Humidity: ${current.humidity}%, Wind: ${current.windspeedKmph} km/h`);
    console.log(`Feels like: ${current.FeelsLikeC}°C`);
  });

5. Python — 3-Day Forecast

import requests

city = 'New York'
data = requests.get(f'https://wttr.in/{city}?format=j1').json()

for day in data['weather']:
    date = day['date']
    avg_temp = (int(day['maxtempC']) + int(day['mintempC'])) / 2
    desc = day['hourly'][0]['weatherDesc'][0]['value']
    print(f"{date}: {avg_temp:.0f}°C, {desc}")

# Also available: astronomy data (sunrise, sunset, moon phase)
astro = data['weather'][0]['astronomy'][0]
print(f"\nSunrise: {astro['sunrise']}, Sunset: {astro['sunset']}")

6. Simple One-Line Output Format

https://wttr.in/Mumbai?format=%t+%c+%w

London JSON: https://wttr.in/London?format=j1

Try This URL Now

Frequently Asked Questions

What output formats are available?: ?format=j1 — JSON, ?format=3 — 3-line terminal view, ?format=png — PNG image, ?format=%c+%t — custom format strings. Default is the full terminal view with ANSI colors and Unicode art.
How do I get weather for disambiguated locations?: Use ?0 suffix or continent/country prefix: ~London,UK, ~London,Ohio. Use IATA airport codes for major airports: JFK, LAX, LHR.
What data does the JSON response include?: Current conditions (temp, feels like, humidity, wind speed/direction, pressure, visibility, UV index), 3-day forecast (hourly breakdown), astronomy (sunrise, sunset, moon phase), and location info (timezone, coordinates).
Can I embed the weather as an image?: Yes — https://wttr.in/London.png returns a PNG image. Use ?m for metric or ?u for imperial units. Configure colors and size with additional parameters.
Is there a rate limit?: wttr.in is free for reasonable usage. It's widely used in terminals and scripts. For high-volume production use, consider caching responses or self-hosting.
What custom format strings are available?: Use ?format=%t+%c+%w+%h+%p for temperature, condition symbol, wind, humidity, and precipitation. Full list: %c (condition), %t (temp), %w (wind), %h (humidity), %p (precipitation), %l (location).

API Details

API URL: https://wttr.in/{location}
Documentation: wttr.in
Category: Weather
Authentication: Not Required
Output Formats: JSON, plain text, PNG, ANSI

What You Can Build

Terminal weather widget for your shell prompt or tmux status bar
Weather dashboard showing conditions for multiple cities
Embedded weather image for blogs, READMEs, or dashboards
Travel planning app comparing weather across destinations
CI/CD pipeline weather check before outdoor deployment activities