National Weather Service United States Department of Commerce

Widespread Showers in the Mid-Atlantic

Widespread showers and some thunderstorms from Ian may produce isolated flash flooding in the central Appalachians into the Mid-Atlantic and southern New England through the weekend. Hazardous conditions persist along portions of the East coast. Showers, thunderstorms, and high elevation snow are possible across the Central/Southern Rockies and into the Great Basin. Read More >

National Weather Service - Denver/Boulder, Colorado

Denver Area Normals & Extremes for September

January | February | March | April | May | June | July | August | September | October | November | December

Date Normal High Record High Year Set Record Warmest Minimum Year Set   Normal Low Record Low Year Set Record Coldest Maximum Year Set   Maximum Precipitation Year Set Maximum Snowfall Year Set

1

85

98

2019

68

2011   55

44

1962

57

1972   0.56 1904 0.0 -

2

85

100

2019

67

1939   55

40

1952

52

1974   1.05 1938 0.0 -

3

84

97

2017

68

2013   54

33

1961

46

1961   1.00 1961 4.2 1961

4

84

97

1995^

69

2013   54

40

1968^

52

1929   1.94 1909 T 1951

5

84

101#

2020

66

2019^   54

38

1962

51

1918   1.02 1918 0.0 -

6

83

98

2022

67

2022^   54

34

1929

45

1929   0.37 1881 0.0 -

7

83

99

2022

66

2022   53

34

1929

41

1929   1.22 1972 T 1929

8

83

99

2022

64

1940^   53

31

2020^

42

1929   0.88 1894 1.0 2020

9

83

96

2021

63

1994^   53

31

2020^

42

2020   1.30 1969 T 2020

10

82

99

2021

66

2005   52

35

2020^

42

1898   0.52 1924 T 1898

11

82

97

2021

65

1939^   52

32

1898

41

1989   0.75 1913 T 2014

12

81

94

1911

64

1939^   52

31

1902

40

1989   1.11 2013 2.3 1989

13

81

96

2018^

64

2018   51

33

1993

49

1961   0.64 1993 5.4 1993

14

81

92

2018^

63

1895^   51

29

2003

43

1912   2.01 2013 T 1912

15

80

94

2018

61

1992^   51

32

1912^

47

1903   0.89 1958 T 1912

16

80

95

2000

63

2000   50

30

1965

48

1971   0.38 1971^ 2.7 1971

17

79

95

2000

64

2018   50

30

1965

35

1971   1.17 1971 12.0 1971

18

79

93

2021^

69

1947   49

23

1971

40

1971   1.22 1996 0.9 1971

19

79

96

2010

62

2014   49

20

1971

46

1965   1.31 1955 0.2 1955

20

78

94

2010

65

1941   49

28

1983

45

1965   0.97 1965 3.5 1965

21

78

92

2017

60

1926   48

27

1995

36

1995   2.70 1902 4.2 1951

22

77

89

1953

62

1884   48

27

1895

45

1941   0.96 1895 11.4 1895

23

77

90

1905^

63

1934   47

29

1895

41

2000   0.83 2017 T 1965

24

76

91

2020

59

2020   47

29

2000^

40

1913   0.67 1961 4.0 1913

25

76

91

1998

61

2020   46

25

1926

45

1934   1.13 1915 3.0 1970

26

75

90

2010^

60

1948   46

28

1927

34

1927   1.41 2012 5.9 1908

27

75

92

1953

59

2001   45

21

1908

35

1936   0.81 1936 2.8 1935

28

74

92

2010

59

1931   45

21

1985

34

1984   1.77 1936 15.0 1936

29

74

92

1892

61

1981   45

17*

1985

29

1985   1.01 1959 10.1 1959

30

73

90

1980

62

1891   44

25

1985

36

1959   0.73 1904 2.3 1959

 

The Normal High and Low Temperatures are calculated from 1991-2020 data.

The Temperature Extremes range from 1872-Present

^ - Also in Previous Years

# - Highest Temperatures of the Month:  101° on 9/5/2020

* - Lowest Temperature of the Month:  17° on 9/29/1985

- The September Mean Temperature is 64.8° (from 1991-2020 data)

- Data collected at the Downtown City Office from 1872 thru December 1948, then at the Stapleton Airport Office from

January 1950 thru February 1995, then at Denver International Airport from March 1995 to Present.

 

Updated: 9/9/2022