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Puerto Rico deserves its reputation for having beautiful scenery and a mild climate. During the month of January, the temperature doesn't vary much during the day.
On average, temperatures peak at degrees during the afternoon dropping to degrees late at night.
This data indicates that during the first part of the month the low temperature averages degrees while the average daily high is degrees. During the middle of the month the low temperature will typically average degrees and the high is about degrees on average. Over the last third of January the low averages degrees and the high temperature averages degrees. For more detailed information about January temperatures in Puerto Rico, browse the table above.