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December Weather in Santo Tomas, Mexico

Last updated: August 27, 2025

In December, the average temperature in Santo Tomas, Mexico hovers around 19°C (66°F), with minimums reaching 8°C (46°F) and maximums soaring to 29°C (84°F). Expect a precipitation amount of 73 mm (2.9 in) spread over 14 days, alongside a high average humidity of 86%.

December Temperature in Santo Tomas

In December in Santo Tomas, the average temperature is 19°C (66°F). Maximum temperatures can reach 29°C (84°F), while minimums can drop as low as 8°C (46°F). This makes Santo Tomas an ideal destination for travelers seeking comfortable weather and a mix of warm and cool days.

December Weather in Santo Tomas: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Santo Tomas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santo Tomas, December typically has an average temperature of 19°C (66°F), with highs reaching up to 29°C (84°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec656769747673727373726866
Data source: Temperature data for Santo Tomas 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 Santo Tomas

In Santo Tomas in December, the total precipitation amount is 73 mm (2.9 in) over the course of 14 days.

December Precipitation Trends in Santo Tomas

The chart displays monthly precipitation patterns in Santo Tomas, 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 Santo Tomas, December typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec8047467920835917023528529214773
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Santo Tomas

In Santo Tomas in December, humidity is 86%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket enveloping you, making travel slightly uncomfortable as the air feels heavy and sticking to your skin.

December Average Humidity in Santo Tomas

This chart illustrates the average monthly humidity levels in Santo Tomas, 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 Santo Tomas is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%73%59%53%54%55%61%71%77%78%82%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Santo Tomas

In Santo Tomas in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Santo Tomas.

Maximum UV Index Levels in Santo Tomas for December

The chart shows the monthly maximum UV Index (UVI) for Santo Tomas 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 Santo Tomas typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141414141413109
Data source: Santo Tomas 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 Santo Tomas Compares to Other Months

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

This table compares monthly weather conditions in Santo Tomas, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather18°C (65°F)80 mm (3.2 inches)84%very high
February Weather20°C (67°F)47 mm (1.9 inches)73%extreme
March Weather21°C (69°F)46 mm (1.8 inches)59%extreme
April Weather23°C (75°F)79 mm (3.1 inches)52%extreme
May Weather24°C (76°F)208 mm (8.2 inches)53%extreme
June Weather23°C (74°F)359 mm (14.1 inches)55%extreme
July Weather22°C (73°F)170 mm (6.7 inches)61%extreme
August Weather23°C (73°F)235 mm (9.2 inches)71%extreme
September Weather23°C (73°F)285 mm (11.2 inches)77%extreme
October Weather22°C (72°F)292 mm (11.5 inches)78%extreme
November Weather20°C (69°F)147 mm (5.8 inches)82%very high
December Weather19°C (66°F)73 mm (2.9 inches)86%very high

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