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December Weather in Santiago, Brazil

Last updated: August 22, 2025

In December, the average temperature in Santiago, Brazil hovers around 24°C (75°F). Expect a range where the minimum can dip to 9°C (48°F) while the maximum can reach a sizzling 38°C (100°F). With an average humidity of 85%, it's a humid month, accompanied by 89 mm (3.5 in) of precipitation spread over 9 days. Prepare for a blend of warmth and occasional rain!

December Temperature in Santiago

In December in Santiago, the average temperature is 24°C (75°F). Maximums can reach 38°C (100°F), while minimums can drop as low as 9°C (48°F). Be prepared for a range of temperatures to ensure a comfortable and enjoyable trip.

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 24°C (75°F), with highs reaching up to 38°C (100°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec777572686158575964677175
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 precipitation amount is 89 mm (3.5 in) during a span of 9 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 89 mm (3.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec17610114610419511310311715017414389
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 85%. With an average temperature of 24°C (75°F), this humidity feels like walking through a warm, heavy blanket, making travel feel sluggish and draining as you navigate through the thick, muggy air.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%73%73%81%87%84%80%71%74%78%77%85%
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 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Santiago, you can check here.

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 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1514129655710131414
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 Weather25°C (77°F)176 mm (6.9 inches)74%extreme
February Weather24°C (75°F)101 mm (4.0 inches)73%extreme
March Weather22°C (73°F)146 mm (5.7 inches)73%extreme
April Weather20°C (68°F)104 mm (4.1 inches)81%very high
May Weather16°C (61°F)195 mm (7.7 inches)87%high
June Weather15°C (59°F)113 mm (4.4 inches)84%moderate
July Weather14°C (57°F)103 mm (4.1 inches)80%moderate
August Weather15°C (60°F)116 mm (4.6 inches)71%high
September Weather18°C (64°F)150 mm (5.9 inches)74%very high
October Weather20°C (68°F)174 mm (6.9 inches)77%extreme
November Weather22°C (72°F)143 mm (5.6 inches)77%extreme
December Weather24°C (75°F)89 mm (3.5 inches)85%extreme

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