As of 9:08 AM AST on August 4, 2026, all 3 cities in San Sebastián Municipio, PR in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is San Sebastián, PR with a reading of 3.8.
Over the next 24 hours, the highest UV Index reading in San Sebastián Municipio, PR is expected to be 9.9 in San Sebastián between 2:00 PM - 3:00 PM AST today.