As of 9:46 AM AST on October 4, 2026, all 1 cities in Guaynabo Municipio, PR in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Guaynabo, PR with a reading of 3.2.
Over the next 24 hours, the highest UV Index reading in Guaynabo Municipio, PR is expected to be 10.5 in Guaynabo between 12:00 PM - 1:00 PM AST today.