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Sioux City August Weather

Averages and records for weather in Sioux City, Iowa in the month of August.

Typical Sioux City August Weather 1991–2020
Average daily high	83.3 °F
Average daily low	61.1 °F
Average monthly precipitation	3.9 inches
Average monthly snow	none
Daily chance of precipitation	31.6%
Daily chance of snow	0%

Sioux City August Weather Records 1948–2024
Highest temperature	104 °F	August 27, 1955
Lowest temperature	37 °F	August 20, 1950
Highest daily low	80 °F	August 23, 2023
Lowest daily high	58 °F	August 25, 1987
Hottest average high temperature	92.9 °F	1955
Coldest average high temperature	76.8 °F	1992
Most daily precipitation	4.3 inches	August 21, 1961
Most monthly precipitation	10.1 inches	2014
Most daily snow	none	-
Most monthly snow	none	-

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
August 1	84.6	62.8	101	51
August 2	84.4	62.6	102	50
August 3	84.3	62.4	99	50
August 4	84.1	62.2	97	46
August 5	84.0	61.9	99	47
August 6	83.9	61.8	98	49
August 7	83.8	61.7	101	47
August 8	83.8	61.6	99	50
August 9	83.7	61.5	98	51
August 10	83.7	61.4	99	47
August 11	83.6	61.4	97	49
August 12	83.6	61.4	97	46
August 13	83.5	61.5	98	45
August 14	83.5	61.4	100	43
August 15	83.4	61.3	101	45
August 16	83.3	61.1	101	48
August 17	83.1	61.0	102	43
August 18	83.0	60.9	100	46
August 19	83.0	60.8	98	43
August 20	83.0	60.6	99	37
August 21	83.0	60.4	99	47
August 22	82.8	60.2	101	50
August 23	82.8	60.0	102	47
August 24	82.5	59.7	102	45
August 25	82.4	59.3	102	45
August 26	82.2	59.1	104	48
August 27	82.0	58.8	104	43
August 28	81.9	58.6	99	39
August 29	81.7	58.5	101	47
August 30	81.6	58.2	102	45
August 31	81.4	57.9	96	43

Weather Station Details

Years	Station	Coordinates
1948–2024	Sioux City Gateway Airport	location