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September Weather in La Plena, Puerto Rico

Last updated: August 31, 2025

The average temperature in La Plena, Puerto Rico during September is a comfortable 26°C (80°F). Expect the minimum to dip to 23°C (74°F) and the maximum to soar to 30°C (86°F). However, be prepared for some rain, as the area receives an average of 173 mm (6.8 in) of precipitation spread over 25 days. With an average humidity of 79%, the atmosphere is sure to feel warm and lush!

September Temperature in La Plena

In September in La Plena, the average temperature is 26°C (80°F). Maximums can reach 30°C (86°F), while minimums can drop to as low as 23°C (74°F). This mild climate makes La Plena an ideal destination for travelers seeking comfortable weather.

September Weather in La Plena: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in La Plena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Plena, September typically has an average temperature of 26°C (80°F), with highs reaching up to 30°C (86°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec747474757778798079787776
Data source: Temperature data for La Plena 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 La Plena

In La Plena in September, the total precipitation amount is 173 mm (6.8 in) spread over 25 days.

September Precipitation Trends in La Plena

The chart displays monthly precipitation patterns in La Plena, 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 La Plena, September typically receives around 173 mm (6.8 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec37396260767110610517313610646
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in La Plena

In La Plena in September, humidity is 79%. With an average temperature of 26°C (80°F), this humidity feels like an enveloping warm blanket, making travel feel slightly sluggish and prompting frequent hydration breaks to stay comfortable while exploring the sights.

September Average Humidity in La Plena

This chart illustrates the average monthly humidity levels in La Plena, 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 La Plena is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%75%76%76%78%81%80%79%79%78%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in La Plena

In La Plena in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in La Plena, you can check here.

Maximum UV Index Levels in La Plena for September

The chart shows the monthly maximum UV Index (UVI) for La Plena 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 La Plena typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9111314141313131412109
Data source: La Plena 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 La Plena Compares to Other Months

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

This table compares monthly weather conditions in La Plena, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)37 mm (1.5 inches)76%very high
February Weather23°C (75°F)39 mm (1.5 inches)75%extreme
March Weather24°C (75°F)62 mm (2.4 inches)75%extreme
April Weather24°C (76°F)60 mm (2.4 inches)76%extreme
May Weather25°C (77°F)76 mm (3.0 inches)76%extreme
June Weather26°C (79°F)71 mm (2.8 inches)78%extreme
July Weather26°C (80°F)106 mm (4.2 inches)81%extreme
August Weather26°C (80°F)105 mm (4.1 inches)80%extreme
September Weather26°C (80°F)173 mm (6.8 inches)79%extreme
October Weather26°C (79°F)136 mm (5.4 inches)78%extreme
November Weather25°C (78°F)106 mm (4.2 inches)78%very high
December Weather24°C (76°F)46 mm (1.8 inches)77%very high

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