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September Weather in Santa Isabel, Puerto Rico

Last updated: August 31, 2025

In Santa Isabel, Puerto Rico, the average temperature in September hovers around 26°C (80°F), offering a pleasant atmosphere. Expect minimum temperatures to drop to 23°C (75°F), while the highs can reach 30°C (86°F). However, be prepared for some rain, as 158 mm (6.2 in) of precipitation typically falls over 23 days. With an average humidity of 79%, this month is a reminder of the region's lush, tropical charm.

September Temperature in Santa Isabel

In September in Santa Isabel, the average temperature is 26°C (80°F). Maximums can reach 30°C (86°F), and minimums can be as low as 23°C (75°F). This makes it a perfect time for travelers to enjoy the warm weather while exploring the attractions.

September Weather in Santa Isabel: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santa Isabel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Isabel, 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 (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec757575767779798079797776
Data source: Temperature data for Santa Isabel 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 Santa Isabel

In Santa Isabel in September, the precipitation amount is 158 mm (6.2 in) over a span of 23 days.

September Precipitation Trends in Santa Isabel

The chart displays monthly precipitation patterns in Santa Isabel, 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 Santa Isabel, September typically receives around 158 mm (6.2 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec26285350625583891581158831
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Isabel

In Santa Isabel 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 Santa Isabel

This chart illustrates the average monthly humidity levels in Santa Isabel, 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 Santa Isabel 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 Santa Isabel

In Santa Isabel 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 Santa Isabel, you can check here.

Maximum UV Index Levels in Santa Isabel for September

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

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

This table compares monthly weather conditions in Santa Isabel, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)26 mm (1.0 inches)76%very high
February Weather24°C (75°F)28 mm (1.1 inches)75%extreme
March Weather24°C (75°F)53 mm (2.1 inches)75%extreme
April Weather24°C (76°F)50 mm (2.0 inches)76%extreme
May Weather25°C (77°F)62 mm (2.4 inches)76%extreme
June Weather26°C (79°F)55 mm (2.2 inches)78%extreme
July Weather26°C (80°F)83 mm (3.3 inches)81%extreme
August Weather27°C (80°F)89 mm (3.5 inches)80%extreme
September Weather26°C (80°F)158 mm (6.2 inches)79%extreme
October Weather26°C (79°F)115 mm (4.5 inches)78%extreme
November Weather25°C (78°F)88 mm (3.5 inches)78%very high
December Weather25°C (76°F)31 mm (1.2 inches)77%very high

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