As of 3:04 AM AST on February 21, 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 10.3 in San Juan between 12:00 PM - 1:00 PM AST today.