Is the water temperature in San Juan in January comfortable for swimming? I have been to Aruba and St. Martin in the winter and the water temps were nice ( Aruba was actually cooler than St. Martin surprisingly) and swimming was enjoyable. I assume San Juan PR will be similar.
Water temperature in San Juan
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I have been there in January several times. We flew in early and stayed several days prior to a cruise. To be best of my memory, I would say it is as warm as Aruba. I don't recall thinking it was cold. You should be fine.
It will be perfect for swimming, around 80 deg F.