The highest day temperature in December 2025 was 54°F. The lowest night temperature was 2°F. The average values for day and night temperatures during December were 30.0°F и 19.7°F respectivly.

The average sea surface temperature in December 2025 for Kennebunkport was 43.7°F. The maximum and minimum values were 41.2°F and 46.6°F respectively.

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

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

The average wind speed in December is 8.4 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 Kennebunkport in December is 4.9 hours.