The highest day temperature in December 2023 was 60°F. The lowest night temperature was 25°F. The average values for day and night temperatures during December were 50.2°F и 38.9°F respectivly.

The average sea surface temperature in December 2023 for Portoroz was 57.3°F. The maximum and minimum values were 52.6°F and 61.6°F respectively.

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

Precipitation total in December for Portoroz is 4.1 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 5.0 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 Portoroz in December is 4.6 hours.