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Looking Back at New York Weather: September 30
Today in New York Weather History: Labor Day Weekend (1970 - 2021)

Warm September Mornings in New York

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Average low temperatures in New York during September range between 64° at the start of the month to 56° by the 30th, but a typical September will see three days with daily lows of 70° or milder (the average in the years since 2010 has risen to five).  Since 1869, the September with the most days with lows in the 70s is September 1961 - twelve.  At the other end of the spectrum there have been 33 years with no 70-degree lows (about once every four or five years), with the most recent being in 2009.  What follows are additional facts about warm September mornings:

 

  • After 1961's twelve days with lows in the 70s, 1971 follows with eleven and 1959 reported ten such days.  September 1884 had the most consecutive days with lows in the 70s, eight, which occurred between Sept. 4-11.  More recently, September 1979 had a streak of seven days in a row.  The greatest number of 70-degree lows in consecutive years occurred in from 1905 to 1907 when there were eight, seven and nine, respectively.
  • The warmest daily minimum in September is 79°, which happened twice, first on Sept. 7, 1881 and a second time on Sept. 2, 1898.  Lows of 78° have occurred five times: on Sept. 3 and 4 in 1898; Sept. 11, 1983; Sept. 6, 1985; and most recently on Sept. 2, 2010. 
  • The coolest low temperature to be the mildest of any September is 64°, which occurred in 1917 and 1935.
  • There has been one three-year period with no 70-degree lows in September, 1962 to 1964.  The longest streak of Septembers with lows in the 70s lasted twenty-three years between 1894 and 1916.  We're currently in the midst of an eleven-year streak (2010-2020), with every September except for 2019 and 2020 having four or more lows in the 70s.
  • Although only six of the days had 70-degree lows, September 2018 established a new record with 17 days with lows of 67° degrees or warmer (the average number of such days is six).

 

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Harry

Looks like September 2019 will only have one 70 degree low and it was exactly 70 (on the 23rd)

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