December weather forecast and climate
Montevideo, Uruguay

Beautiful lawns and palm trees in the independence square outside the Centrally placed Salvo Palace in Montevideo, Uruguay
Beautiful lawns and palm trees in the independence square outside the Centrally placed Salvo Palace in Montevideo, Uruguay
December, the first month of the summer, in Montevideo, is still a warm month, with average temperature varying between 16.3°C (61.3°F) and 26.5°C (79.7°F).

Temperature

In December, the average high-temperature is practically the same as in November - a still moderately hot 26.5°C (79.7°F). In Montevideo, Uruguay, the average low-temperature is 16.3°C (61.3°F).

Humidity

The least humid month is December, with an average relative humidity of 67%.

Rainfall

In Montevideo, during December, the rain falls for 6 days and regularly aggregates up to 84.4mm (3.32") of precipitation. Throughout the year, in Montevideo, there are 77 rainfall days, and 1101.2mm (43.35") of precipitation is accumulated.

Sea temperature

In December, the average sea temperature is 21.9°C (71.4°F).
Note: Swimming in 21.9°C (71.4°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

The month with the longest days in Montevideo is December, with an average of 14.5h of daylight.

Sunshine

In Montevideo, the average sunshine is 9.2h.

UV index

January and December, with an average maximum UV index of 12, are months with the highest UV index in Montevideo. A UV Index reading of 11, and higher, represents an extreme health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 12 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in December in Montevideo?

The average high-temperature, in December, is 26.5°C (79.7°F), while the average low-temperature is 16.3°C (61.3°F).

What is the least humid month in Montevideo?

December is the least humid month in Montevideo, with an average relative humidity of 67%.

What is the average humidity in December in Montevideo?

The average relative humidity in December is 67%.

How much does it rain in Montevideo in December?

In Montevideo, Uruguay, during December, the rain falls for 6 days and regularly aggregates up to 84.4mm (3.32") of precipitation.

What is the sea temperature in December in Montevideo?

In Montevideo, the average seawater temperature in December is 21.9°C (71.4°F). For swimming, a surface water temperature of 21.9°C (71.4°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

When are the longest days in Montevideo?

December has the longest days of the year in Montevideo, with an average of 14.5h of daylight.

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

In December, the average length of the day in Montevideo, Uruguay, is 14.5h.

How long on average sun shines in December in Montevideo?

In December, the average sunshine in Montevideo, Uruguay, is 9.2h.

What is the month with the highest UV index in Montevideo?

January and December, with an average maximum UV index of 12, are months with the highest UV index in Montevideo, Uruguay.

What is the UV index intensity in December in Montevideo?

In Montevideo, Uruguay, the average daily maximum UV index in December is 12. A UV Index estimate of 11, and higher, represents an excessive health risk from unsafe exposure to the Sun's UV rays.
Average temperature in December - Montevideo, Uruguay
  • Average high temperature in December: 26.5°C

The warmest month (with the highest average high temperature) is January (28.4°C).
The month with the lowest average high temperature is July (15°C).

  • Average low temperature in December: 16.3°C

The month with the highest average low temperature is January (18°C).
The coldest month (with the lowest average low temperature) is July (7.2°C).

Average humidity in December - Montevideo, Uruguay
  • Average humidity in December: 67%

The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is December (67%).

Average rainfall in December - Montevideo, Uruguay
  • Average rainfall in December: 84.4mm

The wettest month (with the highest rainfall) is October (108.5mm).
The driest month (with the least rainfall) is June (83.1mm).

Average rainfall days in December - Montevideo, Uruguay
  • Average rainfall days in December: 6 days

Months with the highest number of rainy days are February, June, July, October and November (7 days).
Months with the least rainy days are January, March, April, May, August, September and December (6 days).

Average sea temperature in December - Montevideo, Uruguay
  • Average sea temperature in December: 21.9°C

The best month for swimming (with the highest average sea temperature) is January (24.2°C).
The coldest month (with the lowest average sea temperature) is July (11.3°C).

Average daylight in December / Average sunshine in December - Montevideo, Uruguay
  • Average daylight in December: 14.5h

The month with the longest days is December (Average daylight: 14.5h).
The month with the shortest days is June (Average daylight: 9.8h).

  • Average sunshine in December: 9.2h

The month with the most sunshine is January (Average sunshine: 9.5h).
The month with the least sunshine is June (Average sunshine: 4.3h).

Average UV index in December - Montevideo, Uruguay
  • Average UV index in December: 12

Months with the highest UV index are January and December (UV index 12).
Months with the lowest UV index are June and July (UV index 2).