Santiago
Chile
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Santiago, Chile

Breathtaking view of the cityscape of Santiago, Chile, with the Andean Mountain Ranges in the distance
Breathtaking view of the cityscape of Santiago, Chile, with the Andean Mountain Ranges in the distance
December, the first month of the summer, in Santiago, is also a moderately hot month, with average temperature ranging between min 10.9°C (51.6°F) and max 28.1°C (82.6°F).

Temperature

In Santiago, the average high-temperature is practically the same as in November - a still moderately hot 28.1°C (82.6°F). The average low-temperature, in December, is 10.9°C (51.6°F).

Heat index

In December, the average heat index is evaluated at 29.4°C (84.9°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, clothing, wind, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Santiago, the average relative humidity is 58%.

Rainfall

During December, Santiago regularly aggregates up to 1.7mm (0.1") of precipitation. During the entire year, Santiago aggregates up to 281.9mm (11.1") of precipitation.

Daylight

December has the longest days of the year in Santiago, Chile, with an average of 14.3h of daylight.

Sunshine

The average sunshine in December is 11.2h.

UV index

Months with the highest UV index are January, February and December, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 12 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Protect yourself by liberally applying a sunscreen of at least 30 SPF. Sunscreen prevents sunburn and decreases the damaging effects of Sun's radiation on the immune system.

What is the temperature in December in Santiago?

The average high-temperature, in December, is 28.1°C (82.6°F), while the average low-temperature is 10.9°C (51.6°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), that combines both air temperature and relative humidity, in December is calculated to 29.4°C (84.9°F).

What is the average humidity in December in Santiago?

In Santiago, the average relative humidity in December is 58%.

How much does it rain in Santiago in December?

In Santiago, Chile, in December, 1.7mm (0.1") of precipitation is typically accumulated.

When are the longest days in Santiago?

December has the longest days of the year, with an average of 14.3h of daylight.

What is the average length of the day in December in Santiago?

In Santiago, the average length of the day in December is 14.3h.

How many hours of sunshine does Santiago have in December?

In December, the average sunshine in Santiago, Chile, is 11.2h.

What are the months with the highest UV index in Santiago?

Months with the highest UV index are January, February and December, with an average maximum UV index of 12.

What is the UV index intensity in December in Santiago?

In December, the average daily maximum UV index in Santiago is 12. A UV Index reading of 11, and higher, represents an extreme health threat from the exposure to the Sun's UV radiation.
Average temperature in December - Santiago, Chile
  • Average high temperature in December: 28.1°C

The warmest month (with the highest average high temperature) is January (29.4°C).
The month with the lowest average high temperature is July (14.3°C).

  • Average low temperature in December: 10.9°C

The month with the highest average low temperature is January (11.8°C).
The coldest month (with the lowest average low temperature) is July (2.5°C).

Average humidity in December - Santiago, Chile
  • Average humidity in December: 58%

Months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is January (57%).

Average rainfall in December - Santiago, Chile
  • Average rainfall in December: 1.7mm

The wettest month (with the highest rainfall) is June (69.8mm).
The driest month (with the lowest rainfall) is January (0.3mm).

Average rainfall days in December - Santiago, Chile
  • Average rainfall days in December: 0 days

Months with the highest number of rainy days are June and July (7 days).
Months with the lowest number of rainy days are January, February and December (0 days).

Average daylight in December / Average sunshine in December - Santiago, Chile
  • Average daylight in December: 14.3h

The month with the longest days is December (Average daylight: 14.3h).
The month with shortest days is June (Average daylight: 10h).

  • Average sunshine in December: 11.2h

The month with most sunshine is January (Average sunshine: 11.7h).
The month with least sunshine is June (Average sunshine: 4h).

Average UV index in December - Santiago, Chile
  • Average UV index in December: 12

Months with the highest UV index are January, February and December (UV index 12).
Months with the lowest UV index are June and July (UV index 3).