The highest day temperature in December 2025 was 102°F. The lowest night temperature was 55°F. The average values for day and night temperatures during December were 87.2°F и 69.3°F respectivly.

The average sea surface temperature in December 2025 for Montevideo was 77.1°F. The maximum and minimum values were 71.0°F and 83.4°F respectively.

Most of the days in December are sunny but you can also expect cloudy and gloomy days.

Precipitation total in December for Montevideo is 2.5 in.

The average wind speed in December is 10.7 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Montevideo in December is 11.1 hours.