As of 8:10 AM AST on September 10, 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 1.3.
Over the next 24 hours, the highest UV Index reading in San Juan Municipio, PR is expected to be 11.1 in San Juan between 12:00 PM - 1:00 PM AST today.