As of 1:27 PM AST on September 20, 2026, out of 281 cities in Puerto Rico in our database, 174 cities (62%) have a UV Index reading of Extreme, while 107 cities (38%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Yauco, PR with a reading of 11.2.
Over the next 24 hours, the highest UV Index reading in Puerto Rico is expected to be 11.2 in Yauco between 1:00 PM - 2:00 PM AST today.