If you are planning to visit the lovely city of Madrid, knowing when the best time to go is a great way to ensure that you have the most fun on your vacation. Summer stretches from June to September. These are the hottest months but should not be missed because of the music festivals and open-air concerts that take place throughout the city. August is the best month to explore the beautiful beaches in Madrid. Spring, from mid-March to May, is also a pleasant time to see the city. Throughout these months the weather is warm during the day, and cool at night, making nightlife very exciting.