As of 3:11 PM AST on May 12, 2026, all 2 cities in San Juan Municipio, PR in our database have a UV Index reading of High. The city with the highest UV Index reading right now is San Juan, PR with a reading of 7.
Over the next 24 hours, the highest UV Index reading in San Juan Municipio, PR is expected to be 12.3 in San Juan between 12:00 PM - 1:00 PM AST tomorrow.