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September Weather in Puerto Rico, Argentina

Last updated: August 22, 2025

In Puerto Rico, Argentina, the average temperature in September hovers around 21°C (71°F). Temperatures can range from a chilly 7°C (45°F) to a scorching 39°C (102°F). Expect approximately 100 mm (3.9 in) of precipitation spread over 9 days, with an average humidity of 54%. Prepare for a month of varied weather!

September Temperature in Puerto Rico

In September in Puerto Rico, the average temperature is 21°C (71°F), with maximums reaching up to 39°C (102°F) and minimums dipping as low as 7°C (45°F). This diverse range of temperatures makes Puerto Rico an ideal destination for travelers seeking both warm days and cooler evenings, perfect for exploring and enjoying outdoor activities.

September Weather in Puerto Rico: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Puerto Rico, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Puerto Rico, September typically has an average temperature of 21°C (71°F), with highs reaching up to 39°C (102°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec797775716562616470727578
Data source: Temperature data for Puerto Rico generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Puerto Rico

In Puerto Rico in September, the precipitation amount is 100 mm (3.9 in) spread over 9 days.

September Precipitation Trends in Puerto Rico

The chart displays monthly precipitation patterns in Puerto Rico, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Puerto Rico, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec170103109961941167654100193145112
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Puerto Rico

In Puerto Rico in September, humidity is 54%. With an average temperature of 21°C (71°F), this humidity feels like a comfortable embrace, making it enjoyable for traveling, as you can savor the outdoors without feeling overwhelmed by the heat or stickiness.

September Average Humidity in Puerto Rico

This chart illustrates the average monthly humidity levels in Puerto Rico, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Puerto Rico is approximately 54%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%71%74%82%82%73%67%49%54%58%69%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Puerto Rico

In Puerto Rico in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Puerto Rico.

Maximum UV Index Levels in Puerto Rico for September

The chart shows the monthly maximum UV Index (UVI) for Puerto Rico in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Puerto Rico typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec15141310756710131414
Data source: Puerto Rico September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Puerto Rico Compares to Other Months

Weather in Puerto Rico varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Puerto Rico, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Puerto Rico, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)170 mm (6.7 inches)77%extreme
February Weather25°C (78°F)103 mm (4.0 inches)71%extreme
March Weather24°C (76°F)109 mm (4.3 inches)74%extreme
April Weather22°C (71°F)96 mm (3.8 inches)82%very high
May Weather18°C (65°F)194 mm (7.6 inches)82%high
June Weather17°C (62°F)116 mm (4.5 inches)73%moderate
July Weather16°C (61°F)76 mm (3.0 inches)67%high
August Weather18°C (64°F)54 mm (2.1 inches)49%high
September Weather21°C (71°F)100 mm (3.9 inches)54%very high
October Weather22°C (73°F)192 mm (7.6 inches)58%extreme
November Weather24°C (76°F)145 mm (5.7 inches)69%extreme
December Weather26°C (78°F)112 mm (4.4 inches)84%extreme

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