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December Weather in San Marcos, Peru

Last updated: August 27, 2025

In December, the average temperature in San Marcos, Peru hovers around 13°C (55°F), with a comfortable range that can dip to a minimum of 4°C (39°F) and peak at 22°C (71°F). Expect significant rainfall with a precipitation amount of 259 mm (10.2 in) spread over 26 days, contributing to a high average humidity of 82%.

December Temperature in San Marcos

In December in San Marcos, the average temperature is 13°C (55°F), with maximums reaching 22°C (71°F) and minimums dropping to as low as 4°C (39°F). This mild weather makes it a great time to explore the outdoors and enjoy various activities in San Marcos.

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

The chart illustrates December temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, December typically has an average temperature of 13°C (55°F), with highs reaching up to 22°C (71°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec545554545454535454545555
Data source: Temperature data for San Marcos 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 Marcos

In San Marcos in December, the precipitation amount is 259 mm (10.2 in) over the course of 26 days.

December Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, 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 Marcos, December typically receives around 259 mm (10.2 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec19224533518510348284277194219259
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Marcos

In San Marcos in December, humidity is 82%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities sticky and uncomfortable for traveling.

December Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, 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 Marcos is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%88%85%78%62%44%38%42%58%69%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Marcos

In San Marcos in December, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in San Marcos.

Maximum UV Index Levels in San Marcos for December

The chart shows the monthly maximum UV Index (UVI) for San Marcos 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 Marcos typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec171819181513141417181616
Data source: San Marcos 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 Marcos Compares to Other Months

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

This table compares monthly weather conditions in San Marcos, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (55°F)192 mm (7.5 inches)83%extreme
February Weather13°C (55°F)245 mm (9.6 inches)81%extreme
March Weather12°C (54°F)335 mm (13.2 inches)88%extreme
April Weather12°C (54°F)185 mm (7.3 inches)85%extreme
May Weather12°C (54°F)103 mm (4.0 inches)78%extreme
June Weather12°C (54°F)48 mm (1.9 inches)62%extreme
July Weather12°C (53°F)28 mm (1.1 inches)44%extreme
August Weather12°C (54°F)42 mm (1.7 inches)38%extreme
September Weather12°C (54°F)77 mm (3.0 inches)42%extreme
October Weather12°C (54°F)194 mm (7.6 inches)58%extreme
November Weather13°C (55°F)219 mm (8.6 inches)69%extreme
December Weather13°C (55°F)259 mm (10.2 inches)82%extreme

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