Earliest and Latest Days of 90° F in Portland

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Portland, Maine history. It is based on NOAA data from the years 1871–2024.

Also see:

Earliest 90 degree day in Portland?

The earliest in the year that Portland, Maine had a high temperature of at least 90 °F is April 28 which happened in 2009.

Latest 90 degree day in Portland?

The latest in the year that Portland, Maine had a high temperature of at least 90 °F is September 26 which happened in 2007.

Earliest Days ≥ 90 °F

Date	Year	Temperature
April 28	2009	92 °F
May 2	2018	90 °F
May 2	2001	91 °F
May 3	2001	92 °F
May 9	1979	92 °F
May 10	1896	92 °F
May 10	1889	92 °F
May 16	1951	90 °F
May 17	1977	90 °F
May 18	2017	93 °F
May 18	1936	92 °F
May 21	2009	91 °F
May 21	1921	93 °F
May 22	1992	90 °F
May 22	1921	91 °F
May 22	1911	91 °F
May 24	1991	91 °F
May 24	1964	90 °F
May 24	1936	90 °F
May 25	2007	92 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
September 26	2007	90 °F
September 22	1914	92 °F
September 22	1895	92 °F
September 21	1978	91 °F
September 21	1914	91 °F
September 21	1895	93 °F
September 18	1955	90 °F
September 16	1941	90 °F
September 16	1939	96 °F
September 15	1993	90 °F
September 14	1931	92 °F
September 14	1903	91 °F
September 12	1961	91 °F
September 12	1947	91 °F
September 11	2013	93 °F
September 11	1983	95 °F
September 11	1961	91 °F
September 11	1931	95 °F
September 10	1897	94 °F
September 9	2016	91 °F
September 9	2002	93 °F