The highest day temperature in January 2026 was 55°F. The lowest night temperature was -9°F. The average values for day and night temperatures during January were 29.1°F и 19.5°F respectivly.

The average sea surface temperature in January 2026 for Boston was 36.6°F. The maximum and minimum values were 31.2°F and 39.8°F respectively.

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

Precipitation total in January for Boston is 2.5 in.

The average wind speed in January is 10.7 mph. It makes January the most windy month of the year for Boston.

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 Boston in January is 5.2 hours.