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September Weather in Cayuco, Puerto Rico

Last updated: August 31, 2025

In September, the average temperature in Cayuco, Puerto Rico hovers around 26°C (80°F), with a minimum of 22°C (73°F) and a maximum reaching up to 33°C (91°F). However, be prepared for some rain, as 215 mm (8.5 in) of precipitation can be expected over approximately 25 days. The air tends to be quite humid too, with an average humidity level of 79%.

September Temperature in Cayuco

In September in Cayuco, the average temperature is 26°C (80°F), with maximums reaching 33°C (91°F) and minimums as low as 22°C (73°F). This makes it an ideal time for travelers seeking warm weather and pleasant conditions.

September Weather in Cayuco: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cayuco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cayuco, September typically has an average temperature of 26°C (80°F), with highs reaching up to 33°C (91°F) and lows dropping to around 22°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec747575767879808079787776
Data source: Temperature data for Cayuco 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 Cayuco

In Cayuco in September, the precipitation amount is 215 mm (8.5 in) spread over 25 days.

September Precipitation Trends in Cayuco

The chart displays monthly precipitation patterns in Cayuco, 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 Cayuco, September typically receives around 215 mm (8.5 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec3141889110910311011721516211433
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cayuco

In Cayuco 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 Cayuco

This chart illustrates the average monthly humidity levels in Cayuco, 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 Cayuco is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%74%75%75%77%80%80%79%78%78%76%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cayuco

In Cayuco in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Cayuco.

Maximum UV Index Levels in Cayuco for September

The chart shows the monthly maximum UV Index (UVI) for Cayuco 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 Cayuco typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131314131313131298
Data source: Cayuco 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 Cayuco Compares to Other Months

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

This table compares monthly weather conditions in Cayuco, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)31 mm (1.2 inches)76%very high
February Weather24°C (75°F)41 mm (1.6 inches)75%extreme
March Weather24°C (75°F)88 mm (3.5 inches)74%extreme
April Weather24°C (76°F)91 mm (3.6 inches)75%extreme
May Weather25°C (78°F)109 mm (4.3 inches)75%extreme
June Weather26°C (79°F)103 mm (4.1 inches)77%extreme
July Weather27°C (80°F)110 mm (4.3 inches)80%extreme
August Weather27°C (80°F)117 mm (4.6 inches)80%extreme
September Weather26°C (80°F)215 mm (8.5 inches)79%extreme
October Weather26°C (79°F)162 mm (6.4 inches)78%extreme
November Weather25°C (77°F)114 mm (4.5 inches)78%very high
December Weather24°C (76°F)33 mm (1.3 inches)76%very high

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