The highest day temperature in August 2026 was 90°F. The lowest night temperature was 66°F. The average values for day and night temperatures during August were 81.0°F и 71.2°F respectivly.

The average sea surface temperature in August 2026 for Block Island was 72.5°F. The maximum and minimum values were 70.6°F and 74.8°F respectively.

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

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

The average wind speed in August is 11.1 mph. It makes August one of the most windless 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 August is 8.3 hours.