December Weather in San Antonio, Belize

Last updated: August 22, 2025

In December, the average temperature in San Antonio, Belize hovers around 23°C (74°F), making it a pleasant time to visit. Expect a minimum of 14°C (57°F) and highs reaching up to 32°C (89°F). However, be prepared for some rain, as precipitation averages 65 mm (2.6 in) over 18 days, and the humidity is quite high at 87%.

December Temperature in San Antonio

In December in San Antonio, the average temperature is 23°C (74°F), with maximums reaching 32°C (89°F) and minimums dropping as low as 14°C (57°F). This mild climate makes it an ideal time for travelers to explore the area's outdoor attractions and enjoy pleasant weather.

December Weather in San Antonio: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in San Antonio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Antonio, December typically has an average temperature of 23°C (74°F), with highs reaching up to 32°C (89°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec737577808281818181797674
Data source: Temperature data for San Antonio 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 San Antonio

In San Antonio in December, the precipitation amount is 65 mm (2.6 in) spread over 18 days.

December Precipitation Trends in San Antonio

The chart displays monthly precipitation patterns in San Antonio, 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 San Antonio, December typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec6850655710617212213013921913965
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Antonio

In San Antonio in December, humidity is 87%. With an average temperature of 23°C (74°F), this humidity feels like a warm, sticky embrace that can quickly wear you down while traveling, making even short walks feel exhausting and necessitating frequent breaks for hydration and cool air.

December Average Humidity in San Antonio

This chart illustrates the average monthly humidity levels in San Antonio, 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 San Antonio is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%78%67%62%62%63%66%73%82%86%87%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Antonio

In San Antonio 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 San Antonio.

Maximum UV Index Levels in San Antonio for December

The chart shows the monthly maximum UV Index (UVI) for San Antonio 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 San Antonio typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141313141312109
Data source: San Antonio 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 San Antonio Compares to Other Months

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

This table compares monthly weather conditions in San Antonio, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (73°F)68 mm (2.7 inches)85%very high
February Weather24°C (76°F)50 mm (2.0 inches)78%extreme
March Weather25°C (77°F)65 mm (2.5 inches)67%extreme
April Weather27°C (81°F)57 mm (2.3 inches)62%extreme
May Weather28°C (82°F)106 mm (4.2 inches)62%extreme
June Weather27°C (81°F)172 mm (6.8 inches)63%extreme
July Weather27°C (81°F)122 mm (4.8 inches)66%extreme
August Weather27°C (81°F)130 mm (5.1 inches)73%extreme
September Weather27°C (81°F)139 mm (5.5 inches)82%extreme
October Weather26°C (79°F)219 mm (8.6 inches)86%extreme
November Weather24°C (76°F)138 mm (5.5 inches)87%very high
December Weather23°C (74°F)65 mm (2.6 inches)87%very high

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