The highest day temperature in January 2026 was 54°F. The lowest night temperature was 13°F. The average values for day and night temperatures during January were 35.2°F и 30.0°F respectivly.

The average sea surface temperature in January 2026 for Dewey Beach was 38.1°F. The maximum and minimum values were 33.0°F and 41.2°F respectively.

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

Precipitation total in January for Dewey Beach is 1.2 in.

The average wind speed in January is 13.1 mph. It makes January one of the most windy months of the year for Dewey Beach.

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 Dewey Beach in January is 5.9 hours.