The highest day temperature in December 2023 was 68°F. The lowest night temperature was 48°F. The average values for day and night temperatures during December were 60.6°F и 54.2°F respectivly.

The average sea surface temperature in December 2023 for Sintra was 62.6°F. The maximum and minimum values were 61.2°F and 64.0°F respectively.

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

Precipitation total in December for Sintra is 2.3 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 11.0 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 Sintra in December is 5.9 hours.