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December Weather in Mexico, United States

Last updated: June 24, 2025

In December, the average temperature in Mexico, United States hovers around 3°C (38°F), with a striking variability ranging from a chilling -18°C (0°F) to a pleasant 23°C (74°F). Expect about 41 mm (1.6 in) of precipitation over 6 days, accompanied by a high average humidity of 86%, making it a notably humid period. Whether you're bracing for the cold or enjoying milder days, be prepared for an array of weather!

December Temperature in Mexico

In December in Mexico, the average temperature is 3°C (38°F). Maximums can reach 23°C (74°F), while minimums can drop as low as -18°C (0°F). Be sure to pack layers and prepare for a mix of chilly and warm conditions during your travels.

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

The chart illustrates December temperature patterns in Mexico, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mexico, December typically has an average temperature of 3°C (38°F), with highs reaching up to 23°C (74°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec303346546676797672574337
Data source: Temperature data for Mexico 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 Mexico

In Mexico in December, the precipitation amount is 41 mm (1.6 in) over the course of 6 days.

December Precipitation Trends in Mexico

The chart displays monthly precipitation patterns in Mexico, 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 Mexico, December typically receives around 41 mm (1.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec666112211717711092125561095741
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mexico

In Mexico in December humidity is 86%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps through your layers, making traveling uncomfortable as breath clouds visibly in the crisp air.

December Average Humidity in Mexico

This chart illustrates the average monthly humidity levels in Mexico, 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 Mexico is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mexico

In Mexico in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Mexico, you can check the information here.

Maximum UV Index Levels in Mexico for December

The chart shows the monthly maximum UV Index (UVI) for Mexico 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 Mexico typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Mexico 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 Mexico Compares to Other Months

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

This table compares monthly weather conditions in Mexico, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)66 mm (2.6 inches)82%moderate
February Weather1°C (33°F)61 mm (2.4 inches)80%moderate
March Weather8°C (46°F)122 mm (4.8 inches)80%high
April Weather12°C (54°F)117 mm (4.6 inches)80%very high
May Weather19°C (66°F)177 mm (7.0 inches)82%very high
June Weather25°C (76°F)110 mm (4.3 inches)83%extreme
July Weather26°C (79°F)92 mm (3.6 inches)81%extreme
August Weather24°C (76°F)125 mm (4.9 inches)80%very high
September Weather22°C (72°F)56 mm (2.2 inches)76%very high
October Weather14°C (57°F)109 mm (4.3 inches)76%high
November Weather6°C (44°F)57 mm (2.2 inches)85%moderate
December Weather3°C (38°F)41 mm (1.6 inches)86%moderate

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