What is good afternoon in spanish?

"Good afternoon" in Spanish is "Buenas tardes". It is a common greeting used in the afternoon from around 12:00pm until evening. Just like in English, it is a polite way to greet someone during the afternoon hours. It is important to note that the Spanish culture values politeness and greetings, so using "Buenas tardes" when greeting someone during the afternoon is considered good manners.