average summer temperatures in boston
Days of Hot Weather in Boston. Boston averages ten days a summer with temperatures into the 90s Fahrenheit. But temperatures of over 100 degrees are not normal for the city.Most summer days reach at least 70, while nighttime lows are in the 60s. Highs of 70 degrees can occur in Boston from March to November.o find out how often it rises over 70, 80 or 90 Â°F each month in Boston, scroll down farther. There are also monthly and yearly counts of days with cold weather. All the numbers are averages, based on climate data gathered from 1981 to 2010 at Boston's Logan International Airport on the shore of Boston Harbor.