Highest Daily Low Temperatures in Boston History

This is a list of the hottest daily low temperatures ever recorded in Boston, Massachusetts history from 1893–2024 based on data from the NOAA.

Highest temperatures all-time

Record for the highest daily low temperature in Boston

The highest low temperature for a calendar day in Boston, Massachusetts history was 83 °F which has happened twice, most recently on Sunday July 21, 2019.

Rank	Temperature	Date
1	83 °F	July 21, 2019
1	83 °F	August 2, 1975
3	81 °F	August 29, 2018
3	81 °F	July 22, 2011
3	81 °F	July 5, 1999
3	81 °F	July 21, 1991
7	80 °F	July 20, 2019
7	80 °F	June 21, 2012
7	80 °F	July 3, 2002
7	80 °F	July 20, 1977
7	80 °F	June 6, 1925
7	80 °F	July 11, 1911
13	79 °F	June 29, 2021
13	79 °F	July 20, 2013
13	79 °F	July 6, 2013
13	79 °F	July 5, 2013
13	79 °F	August 9, 2001
13	79 °F	June 10, 1984
13	79 °F	August 28, 1948
13	79 °F	July 5, 1919