The highest day temperature in December 2025 was 54°F. The lowest night temperature was 19°F. The average values for day and night temperatures during December were 40.5°F и 35.0°F respectivly.

The average sea surface temperature in December 2025 for Rehoboth Beach was 43.7°F. The maximum and minimum values were 40.2°F and 50.6°F respectively.

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

Precipitation total in December for Rehoboth Beach is 1.2 in.

The average wind speed in December is 11.6 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 Rehoboth Beach in December is 5.5 hours.