The highest day temperature in January 2026 was 51°F. The lowest night temperature was 2°F. The average values for day and night temperatures during January were 33.4°F и 24.9°F respectivly.

The average sea surface temperature in January 2026 for Fire Island was 39.3°F. The maximum and minimum values were 36.6°F and 40.6°F respectively.

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

Precipitation total in January for Fire Island is 1.1 in.

The average wind speed in January is 11.5 mph. It makes January one of the most windy months of the year for Fire 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 Fire Island in January is 5.4 hours.