As of 10:11 AM AST on January 10, 2026, all 2 cities in San Juan Municipio, PR in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is San Juan, PR with a reading of 3.9.
Over the next 24 hours, the highest UV Index reading in San Juan Municipio, PR is expected to be 7.2 in San Juan between 12:00 PM - 1:00 PM AST today.