As of 7:38 PM AST on January 6, 2026, all 2 cities in San Juan Municipio, PR in our database have a UV Index reading of 0, indicating no radiation from the sun.
Over the next 24 hours, the highest UV Index reading in San Juan Municipio, PR is expected to be 7.3 in San Juan between 12:00 PM - 1:00 PM AST tomorrow.