Earliest and Latest Days of 90° F in Boston

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Boston, Massachusetts history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 90 degree day in Boston?

The earliest in the year that Boston, Massachusetts had a high temperature of at least 90 °F is April 7 which happened in 2010.

Latest 90 degree day in Boston?

The latest in the year that Boston, Massachusetts had a high temperature of at least 90 °F is October 12 which happened in 1954.

Earliest Days ≥ 90 °F

Date	Year	Temperature
April 7	2010	90 °F
April 17	2002	93 °F
April 18	1976	94 °F
April 27	1990	92 °F
April 27	1962	91 °F
April 28	2009	93 °F
April 28	1990	90 °F
May 2	2001	91 °F
May 2	1930	91 °F
May 3	2018	90 °F
May 3	2001	92 °F
May 4	2001	90 °F
May 6	1930	90 °F
May 7	2000	91 °F
May 7	1930	95 °F
May 9	1979	95 °F
May 10	1979	94 °F
May 10	1970	92 °F
May 10	1896	94 °F
May 11	1993	91 °F
May 11	1895	90 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
October 12	1954	90 °F
October 7	1963	90 °F
September 26	2007	93 °F
September 24	1959	90 °F
September 23	2019	92 °F
September 23	1970	92 °F
September 23	1914	94 °F
September 23	1895	96 °F
September 22	1980	90 °F
September 22	1970	91 °F
September 22	1931	92 °F
September 22	1914	90 °F
September 22	1895	94 °F
September 21	1914	90 °F
September 21	1895	94 °F
September 20	1983	97 °F
September 19	1983	92 °F
September 18	1955	90 °F
September 18	1906	90 °F
September 17	1915	91 °F