In Spanish, "lunes" is Monday, "martes" is Tuesday, "miércoles" is Wednesday, "jueves" is Thursday and "viernes" is Friday. "Sábado" is Saturday and "domingo" is Sunday. An audio pronunciation of each word is available on SpanishDict.com.
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Spanish-speaking countries begin the week on Monday. Unlike in English, days of the week aren't capitalized in Spanish. Each day is masculine in Spanish, so when an article appears before the word, it's either "el" for singular words or "los" for plural words. The days that end with an "s" don't change from singular to plural, while those that don't end with an "s" add one. For example, "sábado" becomes "sábados" and "domingo" becomes "domingos" in the plural forms.
Although the articles "el" and "los" typically mean "the" when used as articles, they can also mean "on" when used before a day of the week. For example, the sentence "Escribo el martes" translates to "I write on Tuesdays."