As of 5:55 AM AST on September 18, 2025, all 3 cities in San Sebastián Municipio, PR in our database have a UV Index reading of 0, indicating no radiation from the sun.
Over the next 24 hours, the highest UV Index reading in San Sebastián Municipio, PR is expected to be 8 in San Sebastián between 2:00 PM - 3:00 PM AST today.