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December Weather in La Fortaleza, Mexico

Last updated: August 27, 2025

In La Fortaleza, Mexico, the average temperature in December hovers around 21°C (70°F). During this time, temperatures can dip to a cool 6°C (43°F) or soar to a striking 37°C (100°F). Expect 15 mm (0.6 in) of precipitation over approximately 3 days, coupled with a high average humidity of 91%. Stay prepared for the varying conditions!

December Temperature in La Fortaleza

In December in La Fortaleza, the average temperature is 21°C (70°F). Maximums can reach 37°C (100°F) and minimums can drop as low as 6°C (43°F). This variety in temperatures makes La Fortaleza an ideal destination for travelers seeking both warm days and cooler evenings.

December Weather in La Fortaleza: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in La Fortaleza, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Fortaleza, December typically has an average temperature of 21°C (70°F), with highs reaching up to 37°C (100°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec687277838685858683797470
Data source: Temperature data for La Fortaleza 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 La Fortaleza

In La Fortaleza in December, the precipitation amount is 15 mm (0.6 in) over the course of 3 days.

December Precipitation Trends in La Fortaleza

The chart displays monthly precipitation patterns in La Fortaleza, 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 La Fortaleza, December typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec42203337841631381151651512915
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in La Fortaleza

In La Fortaleza in December, humidity is 91%. With an average temperature of 21°C (70°F), this humidity feels like a warm, heavy blanket wrapped around you, making travel slightly uncomfortable as the air clings to your skin and every step requires a little more effort.

December Average Humidity in La Fortaleza

This chart illustrates the average monthly humidity levels in La Fortaleza, 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 La Fortaleza is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%86%83%80%82%79%72%74%84%92%91%91%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in La Fortaleza

In La Fortaleza in December, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in La Fortaleza, you can refer to this Hourly UV Index in La Fortaleza.

Maximum UV Index Levels in La Fortaleza for December

The chart shows the monthly maximum UV Index (UVI) for La Fortaleza 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 La Fortaleza typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec79121212121312121086
Data source: La Fortaleza 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 La Fortaleza Compares to Other Months

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

This table compares monthly weather conditions in La Fortaleza, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (68°F)42 mm (1.7 inches)88%high
February Weather22°C (72°F)20 mm (0.8 inches)86%very high
March Weather25°C (77°F)33 mm (1.3 inches)83%extreme
April Weather28°C (83°F)37 mm (1.5 inches)80%extreme
May Weather30°C (87°F)84 mm (3.3 inches)82%extreme
June Weather30°C (86°F)163 mm (6.4 inches)79%extreme
July Weather30°C (85°F)138 mm (5.4 inches)72%extreme
August Weather30°C (86°F)115 mm (4.5 inches)74%extreme
September Weather28°C (83°F)165 mm (6.5 inches)84%extreme
October Weather26°C (80°F)151 mm (6.0 inches)92%very high
November Weather23°C (74°F)29 mm (1.2 inches)91%very high
December Weather21°C (70°F)15 mm (0.6 inches)91%high

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