Building a Weather App with Ruby


Building a weather app with Ruby is a practical project that allows you to retrieve weather information from various sources and display it to users. In this guide, we'll walk you through the steps of creating a basic weather app using Ruby.


Before getting started, make sure you have the following prerequisites:

  • Ruby installed on your system
  • A code editor (e.g., Visual Studio Code, Sublime Text)
  • Basic knowledge of Ruby programming
  • An API key from a weather service provider (e.g., OpenWeatherMap)

Step 1: Setting Up Your Project

Start by creating a new directory for your weather app project and set up a basic Ruby environment:

mkdir weather-app
cd weather-app
gem install bundler
bundle init

Step 2: Installing Necessary Gems

You'll need to install gems that allow your Ruby app to make HTTP requests and work with JSON data. Update your Gemfile with the following gems:

# Gemfile
source ''
gem 'rest-client'
gem 'json'

Then, run bundle install to install these gems.

Step 3: Accessing a Weather API

Choose a weather service provider and sign up for an API key. For example, you can use OpenWeatherMap, which offers a free tier. Then, create a Ruby script to fetch weather data using your API key:

require 'rest-client'
require 'json'
# Replace 'YOUR_API_KEY' with your actual API key
api_key = 'YOUR_API_KEY'
city = 'New York' # Replace with the desired city
# Make an API request to retrieve weather data
response = RestClient.get("{city}&appid=#{api_key}")
weather_data = JSON.parse(response)
# Extract relevant information
temperature = weather_data['main']['temp']
description = weather_data['weather'][0]['description']
puts "Current weather in #{city}:"
puts "Temperature: #{temperature} Kelvin"
puts "Description: #{description}"

Step 4: Running Your Weather App

Save your Ruby script, and you can run it using the following command:

ruby weather_app.rb

Your weather app will make an API request and display the temperature and weather description for the specified city.


Building a weather app with Ruby is a practical and fun project that can be extended with additional features like location-based weather, forecasts, and user-friendly interfaces. This project is an excellent way to get hands-on experience with Ruby and working with APIs. As you continue to work on your weather app, consider enhancing its functionality and user experience to create a valuable tool for users interested in weather information.

Happy coding!