Severe Thunderstorms in the East Sunday; Excessive Heat Lingers in the Southern U.S. and Returning to California

Scattered damaging winds from severe thunderstorms will be possible across parts of the Northeast and Mid-Atlantic States Sunday. Excessive heat will continue over the southern U.S. Sunday before another round of heat arrives Monday through the central and southern U.S. spreading into the East by Independence Day. California will see excessive heat starting Tuesday. Read More >

National Weather Service - Denver/Boulder, Colorado

Denver Area Normals & Extremes for September

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	99	2023	68	2011	55	44	1962	57	1972	0.56	1904	0.0	-
2	85	100	2019	67	2023^	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	91	2023	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

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Severe Thunderstorms in the East Sunday; Excessive Heat Lingers in the Southern U.S. and Returning to California

NWS Boulder Denver Daily Normals and Records September

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