As of 12:01 PM AST on September 30, 2026, all 2 cities in San Juan Municipio, PR in our database have a UV Index reading of Extreme. The city with the highest UV Index reading right now is San Juan, PR with a reading of 10.8.
Over the next 24 hours, the highest UV Index reading in San Juan Municipio, PR is expected to be 10.8 in San Juan between 12:00 PM - 1:00 PM AST today.