The highest day temperature in August 2026 was 104°F. The lowest night temperature was 60°F. The average values for day and night temperatures during August were 87.9°F и 68.3°F respectivly.

The average sea surface temperature in August 2026 for Boston was 70.4°F. The maximum and minimum values were 67.8°F and 73.8°F respectively.

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

Precipitation total in August for Boston is 1.7 in. It makes august one of the least rainy months of the year.

The average wind speed in August is 7.3 mph. It makes August the most windless month of the year for Boston.

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 Boston in August is 8.9 hours.