As of 4:12 AM AST on September 9, 2025, all 1 cities in Guaynabo 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 Guaynabo Municipio, PR is expected to be 11.5 in Guaynabo between 1:00 PM - 2:00 PM AST today.