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December Weather in Santiago, Mexico

Last updated: August 27, 2025

In December, the average temperature in Santiago, Mexico is a pleasant 21°C (71°F). Expect a minimum of 14°C (57°F) and a maximum of 29°C (85°F), providing a comfortable range for outdoor activities. However, be prepared for some rain, as the area typically receives 23 mm (0.9 in) of precipitation over 7 days. With an average humidity of 70%, it's a great time to enjoy the lush scenery and vibrant atmosphere!

December Temperature in Santiago

In December in Santiago, the average temperature is 21°C (71°F). The maximum can reach 29°C (85°F) and the minimum can drop to as low as 14°C (57°F). This pleasant climate makes Santiago an ideal destination for outdoor activities and sightseeing.

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

The chart illustrates December temperature patterns in Santiago, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santiago, December typically has an average temperature of 21°C (71°F), with highs reaching up to 29°C (85°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec707173747574757474747270
Data source: Temperature data for Santiago 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 Santiago

In Santiago in December, the total precipitation amount is 23 mm (0.9 in) over a duration of 7 days.

December Precipitation Trends in Santiago

The chart displays monthly precipitation patterns in Santiago, 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 Santiago, December typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec12896953913024264533369223
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Santiago

In Santiago in December humidity is 70%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket, making travel feel both comfortable and slightly sticky, requiring frequent breaks to stay refreshed.

December Average Humidity in Santiago

This chart illustrates the average monthly humidity levels in Santiago, 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 Santiago is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec66%64%63%69%73%76%78%79%78%75%72%70%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Santiago

In Santiago in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Santiago.

Maximum UV Index Levels in Santiago for December

The chart shows the monthly maximum UV Index (UVI) for Santiago 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 Santiago typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1011131413141313131298
Data source: Santiago 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 Santiago Compares to Other Months

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

This table compares monthly weather conditions in Santiago, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (70°F)12 mm (0.5 inches)66%very high
February Weather22°C (71°F)8 mm (0.3 inches)64%extreme
March Weather23°C (73°F)9 mm (0.3 inches)63%extreme
April Weather23°C (74°F)6 mm (0.3 inches)69%extreme
May Weather24°C (76°F)95 mm (3.7 inches)73%extreme
June Weather23°C (74°F)391 mm (15.4 inches)76%extreme
July Weather24°C (75°F)302 mm (11.9 inches)78%extreme
August Weather23°C (75°F)426 mm (16.8 inches)79%extreme
September Weather23°C (74°F)453 mm (17.9 inches)78%extreme
October Weather23°C (74°F)336 mm (13.2 inches)75%extreme
November Weather22°C (73°F)92 mm (3.6 inches)72%very high
December Weather21°C (71°F)23 mm (0.9 inches)70%very high

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