NWS Boulder Denver Daily Normals and Records September

           National Weather Service - Denver, Colorado
            Temperture Normals And Extreme For September
                                                                            
     |Normal|Record| Year |Record| Year ||Normal|Record| Year |Record| Year |
Date | High | High | Set  |Warmest Set  ||  Low |  Low | Set  |Coldest Set  |
     |      |      |      |Minimum      ||      |      |      |Maximum      |
-----|------|------|------|------|------||------|------|------|------|------|
  1  |  84  |  98  | 2019 |  68  | 2011 ||  54  |  44  | 1962 |  57  | 1972 |
  2  |  84  |  100 | 2019 |  67  | 1939 ||  54  |  40  | 1952 |  52  | 1974 |
  3  |  83  |  97  | 2017 |  68  | 2013 ||  53  |  33  | 1961 |  46  | 1961 |
  4  |  83  |  97  | 1995^|  69  | 2013 ||  53  |  40  | 1968^|  52  | 1929 |
  5  |  83  |  101#| 2020 |  66  | 2019^||  53  |  38  | 1962 |  51  | 1918 |

  6  |  82  |  97  | 2020^|  67  | 2020 ||  52  |  34  | 1929 |  45  | 1929 |
  7  |  82  |  95  | 2013^|  63  | 1938^||  52  |  34  | 1929 |  41  | 1929 |
  8  |  82  |  94  | 1959 |  64  | 1940^||  51  |  31  | 2020^|  42  | 1929 |
  9  |  81  |  94  | 1994^|  63  | 1994^||  51  |  31  | 2020^|  42  | 2020 |
 10  |  81  |  93  | 2018^|  66  | 2005 ||  51  |  35  | 2020^|  42  | 1898 |

 11  |  81  |  93  | 2018 |  65  | 1939^||  50  |  32  | 1898 |  41  | 1989 |
 12  |  80  |  94  | 1911 |  64  | 1939^||  50  |  31  | 1902 |  40  | 1989 |
 13  |  80  |  96  | 2018^|  64  | 2018 ||  49  |  33  | 1993 |  49  | 1961 |
 14  |  79  |  92  | 2018^|  63  | 1895^||  49  |  29  | 2003 |  43  | 1912 |
 15  |  79  |  94  | 2018 |  61  | 1992^||  49  |  32  | 1912^|  47  | 1903 |

 16  |  79  |  95  | 2000 |  63  | 1926 ||  48  |  30  | 1965 |  48  | 1971^|
 17  |  78  |  95  | 2000 |  64  | 2018 ||  48  |  30  | 1965 |  35  | 1971 |
 18  |  78  |  93  | 1895 |  69  | 1947 ||  47  |  23  | 1971 |  40  | 1971 |
 19  |  77  |  96  | 2010 |  62  | 1947 ||  47  |  20  | 1971 |  46  | 1965 |
 20  |  77  |  94  | 2010 |  65  | 1941 ||  47  |  28  | 1983 |  45  | 1965 |

 21  |  76  |  92  | 2017 |  60  | 1926 ||  46  |  27  | 1995 |  36  | 1995 |
 22  |  76  |  89  | 1953 |  62  | 1884 ||  46  |  27  | 1895 |  45  | 1941 |
 23  |  75  |  90  | 1905^|  63  | 1934 ||  45  |  29  | 1895 |  43  | 1965 |
 24  |  75  |  91  | 2020 |  59  | 1949 ||  45  |  29  | 2000^|  40  | 1913 |
 25  |  75  |  91  | 1998 |  61  | 2020 ||  44  |  25  | 1926 |  45  | 1934 |

 26  |  74  |  90  | 2010^|  60  | 1948 ||  44  |  28  | 1927 |  34  | 1927 |
 27  |  74  |  92  | 1953 |  59  | 2001 ||  44  |  21  | 1908 |  35  | 1936 |
 28  |  73  |  92  | 2010 |  59  | 1931 ||  43  |  21  | 1985 |  34  | 1984 |
 29  |  73  |  92  | 1892 |  61  | 1981 ||  43  |  17* | 1985 |  29  | 1985 |
 30  |  72  |  90  | 1980 |  62  | 1891 ||  42  |  25  | 1985 |  36  | 1959 |

The Normal High and Low Temperatures are calculated from 1981-2010 data.
           The Temperature Extremes range from 1872-2020.

^ - Also in previous years.

# - Highest Temperature of the Month:  101 degrees on 9/5/2020

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

- The September Mean Temperature is 62.4 degrees (from 1981-2010 DIA data).

- Data collected at the Downtown City Office from 1872-December 1949, then
  at the Stapleton Airport Office from January 1950-February 1995, then at
  Denver International Airport from March 1995-Present. 

UPDATED: 9/9/2020