The highest day temperature in December 2025 was 84°F. The lowest night temperature was 42°F. The average values for day and night temperatures during December were 74.2°F и 59.7°F respectivly.

The average sea surface temperature in December 2025 for St. Petersburg was 69.5°F. The maximum and minimum values were 66.4°F and 72.2°F respectively.

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

Precipitation total in December for St. Petersburg is 0.5 in. It makes december one of the least rainy months of the year.

The average wind speed in December is 10.7 mph.

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 St. Petersburg in December is 6.9 hours.