As of 7:21 AM AST on October 20, 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 9.3 in Guaynabo between 12:00 PM - 1:00 PM AST today.