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December Weather in Guayanilla, Puerto Rico

Last updated: August 31, 2025

In Guayanilla, Puerto Rico, the average temperature in December hovers around 25°C (77°F), offering a delightful climate for outdoor activities. Expect a minimum of 21°C (71°F) and a maximum of 30°C (85°F), making it pleasantly warm. However, be prepared for a bit of rain, as the precipitation amount averages 25 mm (1.0 in) over 6 days, paired with an average humidity of 77%. Stay hydrated and enjoy the warmth!

December Temperature in Guayanilla

In December in Guayanilla, the average temperature is 25°C (77°F). Maximum can reach 30°C (85°F) and minimum can be as low as 21°C (71°F). This pleasant weather makes Guayanilla an ideal destination for outdoor activities and sightseeing during the month of December.

December Weather in Guayanilla: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Guayanilla, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Guayanilla, December typically has an average temperature of 25°C (77°F), with highs reaching up to 30°C (85°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec757575767879808180797877
Data source: Temperature data for Guayanilla 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.

December Precipitation in Guayanilla

In Guayanilla in December, the precipitation amount is 25 mm (1.0 in) spread over 6 days.

December Precipitation Trends in Guayanilla

The chart displays monthly precipitation patterns in Guayanilla, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Guayanilla, December typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec19265355676190941671078725
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Guayanilla

In Guayanilla in December, humidity is 77%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel feel slightly heavy but still pleasant, as long as you stay hydrated and take frequent breaks in the shade.

December Average Humidity in Guayanilla

This chart illustrates the average monthly humidity levels in Guayanilla, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Guayanilla is approximately 77%, 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 December generated using information from the Copernicus Climate Change Service.

December UV Index in Guayanilla

In Guayanilla in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Guayanilla.

Maximum UV Index Levels in Guayanilla for December

The chart shows the monthly maximum UV Index (UVI) for Guayanilla in December, 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 December, the maximum UV index in Guayanilla typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131414131313131298
Data source: Guayanilla December 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 December Weather in Guayanilla Compares to Other Months

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

This table compares monthly weather conditions in Guayanilla, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)19 mm (0.8 inches)76%very high
February Weather24°C (76°F)26 mm (1.0 inches)75%extreme
March Weather24°C (76°F)53 mm (2.1 inches)75%extreme
April Weather25°C (76°F)55 mm (2.1 inches)76%extreme
May Weather25°C (78°F)67 mm (2.6 inches)76%extreme
June Weather26°C (80°F)61 mm (2.4 inches)78%extreme
July Weather27°C (80°F)90 mm (3.5 inches)81%extreme
August Weather27°C (81°F)94 mm (3.7 inches)80%extreme
September Weather27°C (80°F)167 mm (6.6 inches)79%extreme
October Weather26°C (79°F)107 mm (4.2 inches)78%extreme
November Weather26°C (78°F)87 mm (3.4 inches)78%very high
December Weather25°C (77°F)25 mm (1.0 inches)77%very high

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