Sioux Falls August 21 Weather Records

Daily averages and all-time records for weather in Sioux Falls, South Dakota for the date of August 21.

August 21 All-Time Records
1932–2024

98 °F

40 °F

65 °F

Highest daily low

77 °F

2.28 inches

Most snow

none

August 21 Average Weather
1991–2020 ¹

Average high

81.4 °F

Average low

59.7 °F

Chance precipitation

28.4%

Chance snow

Year	High (°F)	Low (°F)	Precip. (inches)
2023	96	68	0.00
2022	82	56	0.00
2021	76	57	0.00
2020	93	69	0.00
2019	77	59	0.00
2018	73	54	0.00
2017	74	63	2.15
2016	80	49	0.00
2015	81	62	0.00
2014	90	69	0.00
2013	81	71	0.00
2012	85	49	0.00
2011	83	52	0.00
2010	91	65	0.00
2009	69	54	0.01
2008	74	65	0.00
2007	83	62	0.01
2006	85	58	0.00
2005	79	54	0.00
2004	80	40	0.00
2003	82	59	0.00
2002	83	66	2.28
2001	80	65	0.01
2000	78	65	0.00
1999	88	66	0.01
1998	80	65	0.00
1997	80	48	0.00
1996	86	67	0.00
1995	89	59	0.00
1994	82	49	0.00
1993	81	61	0.00
1992	82	65	0.00
1991	89	59	0.00
1990	74	62	0.00
1989	83	61	0.09
1988	90	66	1.60
1987	89	65	0.00
1986	73	44	0.00
1985	77	60	0.00
1984	85	63	0.11
1983	93	69	0.00
1982	85	56	0.00
1981	85	62	0.00
1980	82	58	0.00
1979	79	61	0.17
1978	86	68	0.00
1977	77	57	0.00
1976	95	70	0.00
1975	85	68	2.12
1974	77	59	0.07
1973	90	67	0.06
1972	82	63	0.23
1971	92	66	0.00
1970	74	56	0.01
1969	77	65	0.00
1968	98	77	0.00
1967	85	57	0.00
1966	69	54	0.01
1965	75	55	0.41
1964	73	50	0.16
1963	90	62	0.00
1962	90	60	0.00
1961	65	56	0.16
1960	87	61	0.00
1959	98	70	0.38
1958	79	51	0.00
1957	81	63	0.00
1956	80	50	0.00
1955	91	61	0.00
1954	81	67	0.00
1953	84	57	0.00
1952	82	51	0.00
1951	70	49	0.00
1950	81	47	0.00
1949	81	57	0.00
1948	86	54	0.00
1947	98	77	0.00
1946	79	62	0.00
1945	70	51	0.30
1944	80	63	0.02
1943	82	62	0.12
1942	94	73	0.00
1941	85	62	0.00
1940	78	58	0.07
1939	77	47	0.00
1938	87	55	0.00
1937	79	54	0.00
1936	81	68	0.15
1935	79	54	0.00
1934	78	55	0.00
1933	70	61	0.33
1932	82	61	0.00

What's the all-time high for Sioux Falls on 8/21?

For the date of Aug 21, the highest temperature ever reached in Sioux Falls history is 98 °F which has happened 3 times, most recently in 1968.

Highest Temperatures in Sioux Falls on August 21

What's the all-time low for Sioux Falls on 8/21?

For the date of Aug 21, the lowest temperature ever reached in Sioux Falls history is 40 °F which happened in 2004.

Lowest Temperatures in Sioux Falls on August 21

Lowest High Temperatures in Sioux Falls on August 21

What's the most it has ever rained in Sioux Falls on 8/21?

For the date of Aug 21, the most precipitation ever recorded in Sioux Falls history is 2.28 inches which happened in 2002.

All-Time Most Precipitation in Sioux Falls on August 21

Weather Station Details

Years	Station	Coordinates
1932–2024	Sioux Falls	location