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September Weather in Vega Alta, Puerto Rico

Last updated: August 31, 2025

In Vega Alta, Puerto Rico, the average temperature in September reaches a warm 28°C (82°F). Expect a minimum of 25°C (77°F) and a peak of 32°C (90°F). However, don't forget your umbrella, as 172 mm (6.8 in) of rainfall is expected over 23 days, coupled with an average humidity of 79% that creates a tropical atmosphere.

September Temperature in Vega Alta

In September in Vega Alta, the average temperature is 28°C (82°F), with maximums reaching 32°C (90°F) and minimums dropping to 25°C (77°F). It's an ideal time to visit for those who enjoy warm weather and outdoor activities.

September Weather in Vega Alta: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Vega Alta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vega Alta, September typically has an average temperature of 28°C (82°F), with highs reaching up to 32°C (90°F) and lows dropping to around 25°C (77°F).
JanFebMarAprMayJunJulAugSepOctNovDec777777788081828282818078
Data source: Temperature data for Vega Alta 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 Vega Alta

In Vega Alta in September, the total precipitation amount is 172 mm (6.8 in) spread over 23 days.

September Precipitation Trends in Vega Alta

The chart displays monthly precipitation patterns in Vega Alta, 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 Vega Alta, September typically receives around 172 mm (6.8 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec39437255586276861721369350
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Vega Alta

In Vega Alta in September humidity is 79%. With an average temperature of 28°C (82°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration more strenuous and requiring frequent breaks for hydration.

September Average Humidity in Vega Alta

This chart illustrates the average monthly humidity levels in Vega Alta, 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 Vega Alta 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 Vega Alta

In Vega Alta 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 Vega Alta.

Maximum UV Index Levels in Vega Alta for September

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

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

This table compares monthly weather conditions in Vega Alta, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)39 mm (1.5 inches)76%very high
February Weather25°C (77°F)43 mm (1.7 inches)75%extreme
March Weather25°C (77°F)72 mm (2.8 inches)74%extreme
April Weather26°C (78°F)55 mm (2.2 inches)75%extreme
May Weather27°C (80°F)58 mm (2.3 inches)75%extreme
June Weather27°C (81°F)62 mm (2.4 inches)77%extreme
July Weather28°C (82°F)76 mm (3.0 inches)80%extreme
August Weather28°C (82°F)86 mm (3.4 inches)80%extreme
September Weather28°C (82°F)172 mm (6.8 inches)79%extreme
October Weather27°C (81°F)136 mm (5.3 inches)78%extreme
November Weather26°C (80°F)93 mm (3.7 inches)78%very high
December Weather26°C (78°F)50 mm (2.0 inches)76%very high

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