The highest day temperature in September 2024 was 73°F. The lowest night temperature was 61°F. The average values for day and night temperatures during September were 67.9°F и 65.2°F respectivly.

The average sea surface temperature in September 2024 for Block Island was 68.4°F. The maximum and minimum values were 65.8°F and 70.6°F respectively.

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

Precipitation total in September for Block Island is 1.4 in.

The average wind speed in September is 12.3 mph.

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 September is 7.8 hours.