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September Weather in Puerto Rico, Peru

Last updated: August 27, 2025

In September, the average temperature in Puerto Rico, Peru is a pleasant 26°C (79°F), making it ideal for outdoor activities. However, temperatures can range from a cool 19°C (66°F) to a warm 36°C (97°F). Expect 79 mm (3.1 in) of precipitation spread over 10 days, contributing to an average humidity of 42%. Enjoy the balance of warmth and refreshing rain!

September Temperature in Puerto Rico

In September in Puerto Rico, the average temperature is 26°C (79°F). Maximum temperatures can reach 36°C (97°F), while minimum temperatures can drop to as low as 19°C (66°F). This mild climate makes Puerto Rico an ideal destination for travelers looking to enjoy warm weather and 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 26°C (79°F), with highs reaching up to 36°C (97°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec787878787777767779797979
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 79 mm (3.1 in) over a span of 10 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 79 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec2522493462532251761238379167261230
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 42%. With an average temperature of 26°C (79°F), this humidity feels like a comfortable embrace, making it ideal for exploring the sights and sounds of the area without feeling too sticky or uncomfortable.

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 42%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%76%81%86%86%70%47%37%42%62%76%89%
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 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 Puerto Rico, you can check here.

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 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616161312111214151414
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 (78°F)252 mm (9.9 inches)80%extreme
February Weather26°C (79°F)249 mm (9.8 inches)76%extreme
March Weather25°C (78°F)345 mm (13.6 inches)81%extreme
April Weather25°C (78°F)253 mm (10.0 inches)86%extreme
May Weather25°C (78°F)225 mm (8.9 inches)86%extreme
June Weather25°C (77°F)176 mm (6.9 inches)70%extreme
July Weather24°C (76°F)123 mm (4.8 inches)47%extreme
August Weather25°C (78°F)83 mm (3.3 inches)37%extreme
September Weather26°C (79°F)79 mm (3.1 inches)42%extreme
October Weather26°C (79°F)167 mm (6.6 inches)62%extreme
November Weather26°C (79°F)261 mm (10.3 inches)76%extreme
December Weather26°C (79°F)230 mm (9.0 inches)89%extreme

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