The highest day temperature in December 2025 was 82°F. The lowest night temperature was 31°F. The average values for day and night temperatures during December were 67.8°F и 52.5°F respectivly.

The average sea surface temperature in December 2025 for Jacksonville was 63.4°F. The maximum and minimum values were 59.6°F and 68.6°F respectively.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Jacksonville is 1.7 in. It makes december one of the least rainy months of the year.

The average wind speed in December is 6.7 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 Jacksonville in December is 5.6 hours.