Java script

Building a Weather App with JavaScript


In this tutorial, we will learn how to build a weather app using JavaScript, HTML, and CSS. We will use the OpenWeatherMap API to fetch real-time weather data and display it on our app. So let’s get started!


To follow along with this tutorial, you should have a basic understanding of JavaScript, HTML, and CSS. You will also need to sign up for a free API key from OpenWeatherMap ( to retrieve weather data.

Setting up the Project

Create a new folder for your project and navigate to that folder in your preferred code editor. Create three new files: index.html, style.css, and script.js.

Open the index.html file and add the following code:

<!DOCTYPE html>
  <title>Weather App</title>
  <link rel="stylesheet" type="text/css" href="style.css">
  <h1>Weather App</h1>
  <input id="cityInput" type="text" placeholder="Enter city">
  <button id="searchButton" type="button">Search</button>
  <div id="weatherContainer"></div>
  <script src="script.js"></script>

Next, open the style.css file and add the following code:

body {
  font-family: Arial, sans-serif;
  text-align: center;

h1 {
  color: #333;

input {
  padding: 10px;
  margin: 10px;

button {
  padding: 10px 20px;
  background-color: #333;
  color: #fff;
  border: none;
  cursor: pointer;

#weatherContainer {
  margin-top: 30px;

Great! We have our basic project structure set up. Now, let’s move on to writing the JavaScript code.

Fetching Weather Data

In your script.js file, add the following code:

const apiKey = 'YOUR_API_KEY';

document.getElementById('searchButton').addEventListener('click', async () => {
  const city = document.getElementById('cityInput').value;
  const url = `${city}&appid=${apiKey}&units=metric`;

  const response = await fetch(url);
  const data = await response.json();

  if (data.cod === '404') {
    document.getElementById('weatherContainer').innerHTML = 'City not found';
  } else {
    const temperature = data.main.temp;
    const description =[0].description;

    const weatherHTML = `

    document.getElementById('weatherContainer').innerHTML = weatherHTML;

Make sure to replace 'YOUR_API_KEY' with your actual OpenWeatherMap API key.

Testing the App

Open the index.html file in your browser. Enter the name of a city in the input field and click the “Search” button. The app will fetch the current weather data for the entered city and display it below the search box.


Congratulations! You have successfully built a weather app using JavaScript, HTML, and CSS. You can further enhance this app by adding more features like a forecast for multiple days or a location search dropdown. Feel free to experiment and customize it to your liking.

Happy coding!

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