The highest day temperature in August 2025 was 76°F. The lowest night temperature was 65°F. The average values for day and night temperatures during August were 71.5°F и 69.6°F respectivly.

The average sea surface temperature in August 2025 for Siasconset was 69.8°F. The maximum and minimum values were 67.2°F and 73.2°F respectively.

Most of the days in August are cloudy but you can also expect sunny or gloomy days.

Precipitation total in August for Siasconset is 1.3 in. It makes august one of the most rainy months of the year.

The average wind speed in August is 13.1 mph. It makes August 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 August is 8.2 hours.