The highest day temperature in December 2025 was 85°F. The lowest night temperature was 64°F. The average values for day and night temperatures during December were 78.1°F и 72.1°F respectivly.

The average sea surface temperature in December 2025 for Arroio do Sal was 76.2°F. The maximum and minimum values were 73.4°F and 80.4°F respectively.

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

Precipitation total in December for Arroio do Sal is 2.0 in.

The average wind speed in December is 8.5 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 Arroio do Sal in December is 6.3 hours.