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December Weather in San Antonio, Peru

Last updated: August 27, 2025

In December, the average temperature in San Antonio, Peru hovers around 6°C (44°F). You'll experience a minimum of -3°C (27°F) and a maximum of 16°C (62°F). Expect 252 mm (9.9 in) of precipitation spread over 27 days, contributing to an average humidity level of 82%. Prepare for a notably damp and chilly month!

December Temperature in San Antonio

In December in San Antonio, the average temperature is 6°C (44°F), with maximums reaching up to 16°C (62°F) and minimums dropping as low as -3°C (27°F). Be sure to pack layers to stay comfortable during your travels!

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 6°C (44°F), with highs reaching up to 16°C (62°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec434343424039404143434444
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 total precipitation amount is 252 mm (9.9 in) spread over 27 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 252 mm (9.9 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec2502972741274613152378153185252
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 82%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that settles into your bones, making travel uncomfortable as every step feels heavy with moisture and the cool air seems to cling to your skin.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%90%90%84%67%53%47%53%67%75%83%
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 reaches an extreme level of 23, indicating an Extreme Exposure Category. The time to burn is just 10 minutes. For detailed hourly updates on the UV index in San Antonio, you can check 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 23, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec242524181412131517182023
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 Weather6°C (43°F)250 mm (9.8 inches)89%extreme
February Weather6°C (43°F)297 mm (11.7 inches)90%extreme
March Weather6°C (43°F)274 mm (10.8 inches)90%extreme
April Weather6°C (42°F)126 mm (5.0 inches)90%extreme
May Weather5°C (41°F)46 mm (1.8 inches)84%extreme
June Weather4°C (40°F)13 mm (0.5 inches)67%extreme
July Weather4°C (40°F)15 mm (0.6 inches)53%extreme
August Weather5°C (41°F)23 mm (0.9 inches)47%extreme
September Weather6°C (43°F)78 mm (3.1 inches)53%extreme
October Weather6°C (43°F)153 mm (6.0 inches)67%extreme
November Weather7°C (44°F)185 mm (7.3 inches)75%extreme
December Weather6°C (44°F)252 mm (9.9 inches)82%extreme

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