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December Weather in Rancagua, Chile

Last updated: August 22, 2025

In Rancagua, Chile, the average temperature in December is a pleasant 19°C (67°F). Expect a minimum of 7°C (44°F) and a maximum of 31°C (89°F), making for a diverse range of weather conditions. There's a slight chance of rain, with an average precipitation amount of 7 mm (0.3 in) over just 1 day. Humidity levels hover around 39%, adding a touch of freshness to the air. Enjoy the mild climate!

December Temperature in Rancagua

In December in Rancagua, the average temperature is 19°C (67°F). Maximums can reach 31°C (89°F), while minimums can drop to as low as 7°C (44°F). Be sure to pack layers for your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Rancagua, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rancagua, December typically has an average temperature of 19°C (67°F), with highs reaching up to 31°C (89°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec696864585145444751556267
Data source: Temperature data for Rancagua 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 Rancagua

In Rancagua in December, the precipitation amount is 7 mm (0.3 in) over the course of 1 day.

December Precipitation Trends in Rancagua

The chart displays monthly precipitation patterns in Rancagua, 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 Rancagua, December typically receives around 7 mm (0.3 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec1869206015083886569197
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rancagua

In Rancagua in December, humidity is 39%. With an average temperature of 19°C (67°F), this humidity feels like a comfortable and pleasant environment for traveling, allowing for enjoyable outdoor activities without the discomfort of excessive moisture in the air.

December Average Humidity in Rancagua

This chart illustrates the average monthly humidity levels in Rancagua, 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 Rancagua is approximately 39%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec40%41%46%54%70%78%82%79%62%64%53%39%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rancagua

In Rancagua 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 Rancagua, you can check here.

Maximum UV Index Levels in Rancagua for December

The chart shows the monthly maximum UV Index (UVI) for Rancagua 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 Rancagua typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141311854468111314
Data source: Rancagua 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 Rancagua Compares to Other Months

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

This table compares monthly weather conditions in Rancagua, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (69°F)18 mm (0.7 inches)40%extreme
February Weather20°C (68°F)6 mm (0.2 inches)41%extreme
March Weather18°C (64°F)9 mm (0.3 inches)46%extreme
April Weather14°C (58°F)20 mm (0.8 inches)54%very high
May Weather11°C (51°F)60 mm (2.3 inches)70%moderate
June Weather7°C (45°F)150 mm (5.9 inches)78%moderate
July Weather7°C (45°F)83 mm (3.3 inches)82%moderate
August Weather8°C (47°F)88 mm (3.5 inches)79%high
September Weather11°C (52°F)65 mm (2.5 inches)62%very high
October Weather13°C (55°F)69 mm (2.7 inches)64%extreme
November Weather17°C (62°F)19 mm (0.7 inches)53%extreme
December Weather19°C (67°F)7 mm (0.3 inches)39%extreme

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