As of 1:10 PM AST on September 13, 2026, all 3 cities in San Sebastián Municipio, PR in our database have a UV Index reading of Extreme. The city with the highest UV Index reading right now is San Sebastián, PR with a reading of 10.7.
Over the next 24 hours, the highest UV Index reading in San Sebastián Municipio, PR is expected to be 11.2 in San Sebastián between 12:00 PM - 1:00 PM AST tomorrow.