The highest day temperature in January 2026 was 49°F. The lowest night temperature was 5°F. The average values for day and night temperatures during January were 33.2°F и 26.5°F respectivly.

The average sea surface temperature in January 2026 for Dennis Port was 34.6°F. The maximum and minimum values were 30.6°F and 37.0°F respectively.

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

Precipitation total in January for Dennis Port is 1.2 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 14.2 mph. It makes January the most windy month of the year for Dennis Port.

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 Dennis Port in January is 4.7 hours.