The highest day temperature in July 2025 was 101°F. The lowest night temperature was 64°F. The average values for day and night temperatures during July were 85.8°F и 72.3°F respectivly.

The average sea surface temperature in July 2025 for Boston was 69.0°F. The maximum and minimum values were 65.2°F and 72.2°F respectively.

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

Precipitation total in July for Boston is 2.5 in.

The average wind speed in July is 7.5 mph. It makes July one of the most windless months 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 July is 9.3 hours.