The highest day temperature in December 2025 was 51°F. The lowest night temperature was 17°F. The average values for day and night temperatures during December were 39.5°F и 33.1°F respectivly.

The average sea surface temperature in December 2025 for Sea Isle City was 44.1°F. The maximum and minimum values were 40.8°F and 51.0°F respectively.

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

Precipitation total in December for Sea Isle City is 1.2 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 11.2 mph. It makes December one of the most windy months of the year for Sea Isle City.

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 Sea Isle City in December is 5.4 hours.