The highest day temperature in January 2026 was 49°F. The lowest night temperature was 8°F. The average values for day and night temperatures during January were 33.1°F и 29.1°F respectivly.

The average sea surface temperature in January 2026 for Block Island was 39.9°F. The maximum and minimum values were 38.2°F and 41.6°F respectively.

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

Precipitation total in January for Block Island is 1.2 in.

The average wind speed in January is 16.0 mph. It makes January one of the most windy months of the year for Block Island.

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 Block Island in January is 5.1 hours.