Sioux City, IA: August

31 August 2026: August 2026 averaged 72.8°F in Sioux City, IA, the coldest August since 2025, tied 65th coldest of 138 (with 2006, 1962, 1945 and 1 other year).

August 2026

Mean temperature: 72.8°F; Coldest since 2025; 65th coldest of 138
Precipitation: 3.85 in; Wettest since 2025; 43rd wettest of 138

A normal August in Sioux City, IA (1991 to 2020): a mean temperature of 72.5°F, between 69.8°F and 74.4°F in eight years of ten and 3.46 in of precipitation, between 1.44 in and 7.10 in in eight years of ten.

The mean temperature of every August in Sioux City, IA since 1889: 72.8°F in 2026; the lowest is 66.2°F, in 1915.

Normal range, 69.8 to 74.4°F

Every year, ranked, as a table

Every August in Sioux City, IA from 1889 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank
2026	72.8	70	83.6	68	62	69	3.85	43
2025	71.6	92	81.8	100	61.5	75	4.01	40
2024	71.5	95	82.2	91	60.7	94	2.41	77
2023	75.1	20	87.4	15	62.8	52	2.49	76
2022	74.1	42	87	22	61.3	80	2.78	64
2021	74.4	33	86.6	26	62.2	61	4.04	39
2020	73.4	62	85.9	35	60.9	85	1.32	121
2019	71.2	101	81.5	107	60.9	85	1.96	89
2018	71.3	100	81.9	98	60.7	94	4.51	29
2017	69	129	79.9	127	58	131	8.16	3
2016	74	44	84.8	50	63.3	36	5.05	22
2015	70.3	111	80.6	116	60.1	107	5.97	12
2014	73	67	81.7	102	64.3	21	10.12	1
2013	73.1	65	83.4	70	62.9	46	3.07	59
2012	72.5	80	87	22	58	131	1.71	103
2011	73.5	58	84.8	50	62.3	60	2.53	73
2010	75.9	14	86.4	28	65.4	15	4.50	30
2009	70.1	116	81.9	98	58.3	129	3.52	52
2008	71.6	92	83.8	65	59.5	113	2.67	68
2007	74.5	31	83.9	64	65.1	17	9.07	2
2006	72.8	70	83.4	70	62.1	65	6.98	9
2005	73.9	47	86.3	31	61.6	74	1.45	117
2004	68.2	135	80.4	121	56	137	0.97	128
2003	74.4	33	87.4	15	61.4	79	1.67	105
2002	71.5	95	82.1	93	60.8	90	5.67	17
2001	71.6	92	83.3	75	59.9	109	3.40	53
2000	73.8	48	85	47	62.6	55	1.78	98
1999	70.9	104	82.1	93	59.6	111	4.57	27
1998	73.5	58	83.2	77	63.8	27	3.55	48
1997	70.6	107	82.4	87	58.9	120	0.63	133
1996	70.4	108	81.1	112	59.7	110	4.69	25
1995	77	11	87.5	13	66.4	8	2.01	85
1994	69.9	121	80.5	117	59.3	116	3.33	54
1993	72.4	83	82.7	83	62.2	61	6.43	10
1992	66.8	137	76.8	137	56.7	134	4.60	26
1991	74	44	85.9	35	62.1	65	2.17	82
1990	73.5	58	84	62	63.1	39	1.34	120
1989	72.7	75	83.4	70	61.9	70	2.01	85
1988	76	13	88.6	8	63.5	32	5.16	21
1987	70.1	116	79.9	127	60.3	106	3.94	41
1986	68.5	132	78.9	132	58.2	130	1.86	93
1985	69.3	127	79.9	127	58.7	124	3.69	44
1984	74.9	25	85.7	42	64	23	0.79	131
1983	80.9	2	91.3	5	70.5	1	1.16	124
1982	72.4	83	81.5	107	63.2	37	1.54	110
1981	71	102	81.2	111	60.8	90	1.72	102
1980	73.7	52	84.1	60	63.4	34	5.68	16
1979	72.4	83	82	95	62.7	54	6.28	11
1978	71.7	90	83	78	60.4	103	4.25	35
1977	69.4	126	80	126	58.8	122	2.53	73
1976	74.2	40	87.8	12	60.5	100	0.30	137
1975	75.1	20	84.8	50	65.4	15	4.56	28
1974	70.7	105	81	113	60.5	100	3.27	55
1973	77.1	9	88.3	9	65.8	12	1.05	126
1972	72.9	69	82.8	82	63	44	2.09	84
1971	73.6	54	86.2	32	60.9	85	0.12	138
1970	75	24	87.1	21	62.9	46	1.01	127
1969	73.6	54	83.8	65	63.4	34	5.91	13
1968	74.4	33	85.9	35	62.9	46	1.52	115
1967	70.4	108	82.4	87	58.4	126	1.35	119
1966	70.1	116	80.8	115	59.4	114	4.88	24
1965	72	86	83.4	70	60.6	98	1.85	94
1964	68.7	131	78.8	133	58.6	125	5.35	19
1963	72.5	80	81.8	100	63.2	37	4.35	31
1962	72.8	70	83.8	65	61.8	73	2.64	71
1961	73.1	65	83	78	63.1	39	7.00	8
1960	74.4	33	85.1	45	63.6	29	5.78	15
1959	77.5	7	88	11	67.1	6	2.31	79
1958	74.7	29	87	22	62.4	59	1.64	107
1957	74.1	42	84.4	57	63.7	28	2.10	83
1956	74.9	25	87.5	13	62.2	61	1.54	110
1955	79.6	5	92.9	3	66.4	8	0.61	135
1954	73.3	63	82.5	84	64	23	1.54	110
1953	74.4	33	87.2	18	61.5	75	1.79	96
1952	70.7	105	81.7	102	59.6	111	3.27	55
1951	71.8	87	82.4	87	61.2	81	7.75	4
1950	68.5	132	80.4	121	56.6	135	4.31	32
1949	73.6	54	85.8	38	61.5	75	3.62	46
1948	74.8	28	86.5	27	63.1	39	3.53	51
1947	80.7	3	94	1	67.5	4	0.63	133
1946	70.2	114	82	95	58.4	126	2.19	80
1945	72.8	70	84.5	55	61	84	1.47	116
1944	71.8	87	82.4	87	61.2	81	4.17	37
1943	74.7	29	85.8	38	63.6	29	1.44	118
1942	73.8	48	85.4	43	62.2	61	1.56	108
1941	75.1	20	87.3	17	63	44	1.26	122
1940	70.3	111	80.1	124	60.5	100	5.33	20
1939	72.6	78	84.4	57	60.8	90	1.97	88
1938	78.1	6	90.2	6	66	10	0.59	136
1937	80.4	4	91.9	4	68.8	3	7.09	6
1936	81	1	93.1	2	68.9	2	1.66	106
1935	75.7	16	86.4	28	65	19	2.00	87
1934	74.5	31	86.9	25	62.1	65	1.12	125
1933	71.5	95	81.5	107	61.5	75	1.74	100
1932	73.7	52	83.3	75	64.1	22	2.94	61
1931	74.9	25	85.8	38	63.9	25	3.90	42
1930	75.6	17	85.1	45	66	10	0.89	129
1929	73.8	48	85	47	62.6	55	1.55	109
1928	73.8	48	84	62	63.6	29	2.67	68
1927	68.4	134	77.9	135	58.8	122	1.90	91
1926	74.4	33	84.8	50	63.9	25	3.54	50
1925	73.5	58	84.5	55	62.6	55	0.71	132
1924	72.7	75	82.5	84	62.9	46	4.24	36
1923	70.4	108	79.9	127	60.9	85	7.63	5
1922	75.5	18	85.8	38	65.1	17	2.92	62
1921	72.8	70	82.9	80	62.8	52	3.17	57
1920	69.8	123	80.5	117	59.1	119	4.30	33
1919	72.6	78	83.4	70	61.9	70	1.91	90
1918	75.8	15	86	34	65.6	13	2.64	71
1917	70.3	111	81.7	102	58.9	120	2.66	70
1916	73.6	54	84.1	60	63.1	39	2.33	78
1915	66.2	138	76.6	138	55.9	138	1.79	96
1914	74	44	85	47	62.9	46	1.74	100
1913	77.1	9	88.7	7	65.5	14	1.88	92
1912	71.4	99	82	95	60.7	94	7.03	7
1911	71	102	81.6	105	60.4	103	2.86	63
1910	70.2	114	80.5	117	60	108	2.76	65
1909	76.9	12	87.2	18	66.5	7	3.02	60
1908	69.8	123	80.1	124	59.4	114	4.28	34
1907	71.5	95	82.2	91	60.7	94	1.53	114
1906	73	67	82.5	84	63.5	32	2.74	66
1905	75.4	19	86.1	33	64.6	20	1.84	95
1904	69.9	121	80.4	121	59.3	116	2.68	67
1903	69.2	128	77.7	136	60.6	98	5.67	17
1902	69.8	123	78.7	134	60.9	85	2.19	80
1901	74.4	33	86.4	28	62.5	58	1.75	99
1900	77.2	8	87.2	18	67.2	5	3.56	47
1899	74.2	40	85.2	44	63.1	39	4.91	23
1898	72.5	80	84.6	54	60.4	103	3.10	58
1897	68.2	135	79.9	127	56.4	136	2.51	75
1896	71.8	87	82.9	80	60.8	90	0.86	130
1895	72.7	75	84.3	59	61.2	81	1.54	110
1894	75.1	20	88.2	10	62.1	65	1.68	104
1893	70	120	81.6	105	58.4	126	5.85	14
1892	71.7	90	81.4	110	61.9	70	4.14	38
1891	70.1	116	81	113	59.3	116	3.55	48
1890	68.9	130	80.5	117	57.4	133	3.64	45
1889	73.3	63	83.6	68	62.9	46	1.19	123

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1936	81
1983	80.9
1947	80.7
1937	80.4
1955	79.6
1938	78.1
1959	77.5
1900	77.2
1973	77.1
1913	77.1

Coldest
Year	Mean, °F
1915	66.2
1992	66.8
2004	68.2
1897	68.2
1927	68.4
1986	68.5
1950	68.5
1964	68.7
1890	68.9
2017	69

Wettest
Year	Precipitation, in
2014	10.12
2007	9.07
2017	8.16
1951	7.75
1923	7.63
1937	7.09
1912	7.03
1961	7.00
2006	6.98
1993	6.43

Driest
Year	Precipitation, in
1971	0.12
1976	0.30
1938	0.59
1955	0.61
1997	0.63
1947	0.63
1925	0.71
1984	0.79
1896	0.86
1930	0.89

The hottest, coldest and wettest days

Hottest day: 94°F; 11 August 2026
Coldest night: 50°F; 8 August 2026
Wettest day: 1.72 in; 13 August 2026

Every month, season and year

Months

Seasons

Years

Sioux City, IA the day's answers

All-time records

Every answer in words

August 2026 brought 3.85 in of precipitation in Sioux City, IA, the wettest August since 2025, 43rd wettest of 138.
The hottest day of August 2026 in Sioux City, IA: 94°F on Tuesday 11 August 2026.
The coldest night of August 2026 in Sioux City, IA: a low of 50°F on Saturday 8 August 2026.
The wettest day of August 2026 in Sioux City, IA: 1.72 in on Thursday 13 August 2026.