Puerto Rico is known for its wonderful scenery and mild climate. In September, the temperature doesn't vary much during the day.

Temperatures will typically rise to degrees during the afternoon declining to degrees late at night.

As shown above, during the first part of the month the daily low averages degrees while the average daily high is degrees. If you vacation during the middle of the month the low temperature will typically average degrees and the high is about degrees on average. During the last part of September the low averages degrees while the average high temperature is degrees. To learn more about temperature fluctuations during September in Puerto Rico, browse the table above.

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