Arrarás was bom on September 27,1961, in Mayagiiez, a college city on the west coast of Puerto Rico. Her father, José Enrique Arrarás, is a lawyer and was chancellor of the University of Puerto Rico at Mayagiiez. For many years, he occupied a central role in Puerto Rican politics as a senator and as a prominent politician. Her mother is Astrid Mangual. Raised both in Mayagiiez and San Juan, Arrarás studied at parochial schools in these two cities and graduated from high school at the elite Colegio Puertorriqueño de Niñas in San Juan.