As of 2:26 PM AST on August 18, 2025, all 3 cities in San Sebastián Municipio, PR in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is San Sebastián, PR with a reading of 8.9.
Over the next 24 hours, the highest UV Index reading in San Sebastián Municipio, PR is expected to be 12 in San Sebastián between 1:00 PM - 2:00 PM AST tomorrow.