As of 4:22 PM AST on November 9, 2026, all 2 cities in San Juan Municipio, PR in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is San Juan, PR with a reading of 1.9.
Over the next 24 hours, the highest UV Index reading in San Juan Municipio, PR is expected to be 7 in San Juan between 1:00 PM - 2:00 PM AST tomorrow.