The highest day temperature in September 2023 was 77°F. The lowest night temperature was 60°F. The average values for day and night temperatures during September were 68.7°F и 69.0°F respectivly.

The average sea surface temperature in September 2023 for Siasconset was 66.5°F. The maximum and minimum values were 62.8°F and 69.8°F respectively.

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

Precipitation total in September for Siasconset is 1.2 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 15.1 mph. It makes September one of the most windless months of the year for Siasconset.

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 Siasconset in September is 7.9 hours.