Sioux City Weather in 2021

Historical record of Sioux City, Iowa weather for the year 2021 based on NOAA data.

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2021 Sioux City Weather Extremes
Highest temperature	97 °F	June 17
Lowest temperature	-28 °F	February 16
Highest daily low	76 °F	June 17
Lowest daily high	-4 °F	February 14
Most daily precipitation	1.7 inches	October 27
Most daily snow	6.0 inches	February 21
Total annual precipitation	23.0 inches	-
Total annual snow	25.5 inches	-

What was the hottest temperature in Sioux City in 2021?

The highest temperature recorded in Sioux City, Iowa in 2021 was 97 °F which happened on June 17.

Highest Temperatures: All-Time By Year

Highest Temperatures in Sioux City in 2021

Rank	Temperature	Date
1	97 °F	Jun 17
2	96 °F	Aug 23
2	96 °F	Jul 24
4	95 °F	Jul 28
4	95 °F	Jul 27
6	94 °F	Jun 5
6	94 °F	Jun 4
8	93 °F	Jul 23
8	93 °F	Jun 23
8	93 °F	Jun 18
8	93 °F	Jun 10

What was the coldest temperature in Sioux City in 2021?

The lowest temperature recorded in Sioux City, Iowa in 2021 was -28 °F which happened 2 different times.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Sioux City in 2021

Rank	Temperature	Date
1	-28 °F	February 16
1	-28 °F	February 15
3	-17 °F	February 9
4	-15 °F	February 14
4	-15 °F	February 12
4	-15 °F	February 8
7	-12 °F	February 11
8	-9 °F	February 7
8	-9 °F	February 6
10	-8 °F	February 13

January 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
January 1	27	7	0.00	0.0
January 2	27	11	0.00	0.0
January 3	28	10	0.00	0.0
January 4	42	14	0.00	0.0
January 5	40	17	0.00	0.0
January 6	37	32	0.47	1.0
January 7	33	29	0.00	0.0
January 8	30	26	0.00	0.0
January 9	29	24	0.00	0.0
January 10	36	28	0.00	0.0
January 11	42	24	0.00	0.0
January 12	49	21	0.00	0.0
January 13	51	25	0.00	0.0
January 14	43	31	0.29	1.0
January 15	31	28	0.09	1.0
January 16	29	19	0.00	0.0
January 17	36	22	0.00	0.0
January 18	37	18	0.00	0.0
January 19	38	12	0.00	0.0
January 20	52	11	0.00	0.0
January 21	41	22	0.00	0.0
January 22	25	14	0.00	0.0
January 23	31	13	0.04	0.5
January 24	29	21	0.00	0.0
January 25	24	16	0.35	4.2
January 26	20	13	0.06	1.5
January 27	20	1	0.00	0.0
January 28	28	1	0.00	0.0
January 29	32	22	0.00	0.0
January 30	34	28	0.00	0.0
January 31	29	27	0.00	0.0

February 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
February 1	28	13	0.00	0.0
February 2	27	18	0.00	0.0
February 3	40	14	0.00	0.0
February 4	34	16	0.14	2.0
February 5	20	3	0.00	0.0
February 6	11	-9	0.02	0.4
February 7	4	-9	0.09	1.1
February 8	5	-15	0.00	0.0
February 9	12	-17	0.00	0.0
February 10	15	1	0.00	0.0
February 11	5	-12	0.09	1.5
February 12	-1	-15	0.05	0.3
February 13	5	-8	0.05	1.2
February 14	-4	-15	0.00	0.0
February 15	-2	-28	0.00	0.0
February 16	1	-28	0.00	0.0
February 17	13	1	0.00	0.0
February 18	20	-1	0.00	0.0
February 19	23	-1	0.00	0.0
February 20	27	1	0.00	0.0
February 21	32	11	0.41	6.0
February 22	44	6	0.00	0.0
February 23	45	20	0.00	0.0
February 24	43	28	0.00	0.0
February 25	42	27	0.00	0.0
February 26	45	27	0.00	0.0
February 27	47	23	0.00	0.0
February 28	35	22	0.00	0.0

March 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
March 1	33	21	0.00	0.0
March 2	58	26	0.00	0.0
March 3	64	25	0.00	0.0
March 4	60	31	0.00	0.0
March 5	57	29	0.00	0.0
March 6	62	27	0.00	0.0
March 7	69	36	0.00	0.0
March 8	67	28	0.00	0.0
March 9	73	42	0.00	0.0
March 10	59	33	0.14	0.0
March 11	53	28	0.00	0.0
March 12	57	24	0.00	0.0
March 13	58	24	0.00	0.0
March 14	49	33	1.44	0.0
March 15	36	33	0.18	1.5
March 16	39	33	0.12	0.0
March 17	38	32	0.00	0.0
March 18	51	25	0.00	0.0
March 19	55	20	0.00	0.0
March 20	63	33	0.00	0.0
March 21	63	38	0.00	0.0
March 22	54	30	0.66	0.0
March 23	50	44	1.01	0.0
March 24	46	34	0.01	0.0
March 25	49	29	0.00	0.0
March 26	56	27	0.02	0.0
March 27	53	33	0.04	0.0
March 28	57	27	0.00	0.0
March 29	76	46	0.00	0.0
March 30	50	30	0.00	0.0
March 31	44	19	0.00	0.0

April 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
April 1	55	14	0.00	0.0
April 2	76	34	0.00	0.0
April 3	78	36	0.00	0.0
April 4	86	39	0.00	0.0
April 5	84	53	0.00	0.0
April 6	79	53	0.00	0.0
April 7	67	46	0.17	0.0
April 8	47	45	0.99	0.0
April 9	57	43	0.00	0.0
April 10	62	32	0.00	0.0
April 11	66	28	0.00	0.0
April 12	56	35	0.00	0.0
April 13	50	29	0.00	0.0
April 14	50	26	0.00	0.0
April 15	47	30	0.00	0.0
April 16	49	38	0.00	0.0
April 17	54	40	0.01	0.0
April 18	66	30	0.00	0.0
April 19	44	28	0.03	0.3
April 20	48	22	0.00	0.0
April 21	48	27	0.01	0.2
April 22	60	22	0.00	0.0
April 23	67	41	0.00	0.0
April 24	57	36	0.00	0.0
April 25	75	36	0.04	0.0
April 26	85	50	0.00	0.0
April 27	59	50	0.00	0.0
April 28	68	44	0.21	0.0
April 29	73	39	0.00	0.0
April 30	80	35	0.00	0.0

May 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	90	62	0.00
May 2	82	61	0.00
May 3	68	48	0.00
May 4	64	34	0.00
May 5	62	29	0.29
May 6	66	34	0.00
May 7	69	41	0.00
May 8	52	41	1.05
May 9	59	38	0.00
May 10	64	34	0.00
May 11	62	31	0.00
May 12	65	34	0.00
May 13	69	35	0.00
May 14	67	48	0.29
May 15	79	47	0.00
May 16	67	53	0.00
May 17	66	58	0.00
May 18	68	54	0.00
May 19	73	56	0.27
May 20	73	62	0.03
May 21	81	62	0.00
May 22	84	67	0.00
May 23	83	67	0.00
May 24	82	61	0.11
May 25	86	57	0.00
May 26	81	53	0.09
May 27	60	47	0.25
May 28	54	45	0.00
May 29	64	38	0.00
May 30	61	49	0.39
May 31	79	44	0.00

June 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	82	46	0.00
June 2	83	50	0.00
June 3	89	51	0.00
June 4	94	64	0.00
June 5	94	71	0.00
June 6	87	69	0.00
June 7	89	68	0.00
June 8	90	64	0.00
June 9	92	66	0.00
June 10	93	67	0.00
June 11	82	60	0.53
June 12	88	53	0.00
June 13	90	54	0.00
June 14	90	61	0.00
June 15	92	56	0.00
June 16	91	64	0.00
June 17	97	76	0.00
June 18	93	63	0.00
June 19	86	63	0.00
June 20	86	57	0.16
June 21	76	51	0.00
June 22	86	48	0.00
June 23	93	57	0.00
June 24	82	69	0.20
June 25	86	64	0.33
June 26	74	61	0.07
June 27	83	58	0.00
June 28	83	61	0.02
June 29	85	59	0.00
June 30	86	58	0.00

July 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)
July 1	88	60	0.00
July 2	89	61	0.00
July 3	88	63	0.00
July 4	89	67	0.00
July 5	92	67	0.00
July 6	88	69	0.01
July 7	77	56	0.01
July 8	76	52	0.29
July 9	88	65	0.06
July 10	73	63	0.35
July 11	85	59	0.00
July 12	82	52	0.00
July 13	81	57	0.00
July 14	81	66	0.71
July 15	83	58	0.00
July 16	83	58	0.00
July 17	83	63	0.00
July 18	84	62	0.00
July 19	86	55	0.00
July 20	87	57	0.00
July 21	88	62	0.00
July 22	89	67	0.00
July 23	93	67	0.00
July 24	96	72	0.00
July 25	90	65	0.00
July 26	90	64	0.00
July 27	95	66	0.00
July 28	95	71	0.00
July 29	91	72	0.00
July 30	84	64	0.00
July 31	87	63	0.00

August 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	83	55	0.00
August 2	82	50	0.00
August 3	81	53	0.00
August 4	81	55	0.06
August 5	88	66	0.64
August 6	86	66	0.05
August 7	83	70	0.01
August 8	84	66	0.00
August 9	91	68	0.00
August 10	90	68	0.00
August 11	90	64	0.00
August 12	89	59	0.00
August 13	87	55	0.00
August 14	85	50	0.00
August 15	85	52	0.00
August 16	89	59	0.00
August 17	91	67	0.00
August 18	89	65	0.00
August 19	91	67	0.00
August 20	89	63	0.10
August 21	79	56	0.00
August 22	84	56	0.00
August 23	96	67	0.00
August 24	92	71	0.00
August 25	90	69	0.00
August 26	85	68	0.83
August 27	89	69	0.74
August 28	90	69	0.24
August 29	83	63	0.00
August 30	83	58	0.26
August 31	81	63	1.11

September 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	78	57	0.00
September 2	73	64	1.03
September 3	71	66	0.00
September 4	79	60	0.00
September 5	82	56	0.00
September 6	85	57	0.00
September 7	80	57	0.00
September 8	80	50	0.00
September 9	78	45	0.00
September 10	85	54	0.00
September 11	91	60	0.00
September 12	80	62	0.01
September 13	82	59	0.00
September 14	74	54	0.00
September 15	80	50	0.00
September 16	89	62	0.00
September 17	78	52	0.31
September 18	85	50	0.00
September 19	87	64	0.00
September 20	75	52	0.28
September 21	70	44	0.00
September 22	72	37	0.00
September 23	79	41	0.00
September 24	71	41	0.00
September 25	78	34	0.00
September 26	86	50	0.00
September 27	92	51	0.00
September 28	90	55	0.00
September 29	80	57	0.00
September 30	80	62	0.91

October 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	74	63	0.02
October 2	66	60	0.00
October 3	77	49	0.00
October 4	81	44	0.00
October 5	77	43	0.00
October 6	73	51	0.00
October 7	75	53	0.00
October 8	82	52	0.00
October 9	80	56	0.00
October 10	67	45	0.00
October 11	75	41	0.00
October 12	75	38	0.00
October 13	66	47	0.41
October 14	61	34	0.01
October 15	61	35	0.00
October 16	68	33	0.00
October 17	77	33	0.00
October 18	76	39	0.00
October 19	74	48	0.00
October 20	62	38	0.08
October 21	49	30	0.01
October 22	54	28	0.00
October 23	58	27	0.00
October 24	50	42	0.57
October 25	55	33	0.00
October 26	58	38	0.00
October 27	56	49	1.70
October 28	58	44	0.02
October 29	61	33	0.00
October 30	68	29	0.00
October 31	50	25	0.00

November 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
November 1	45	22	0.00	0.0
November 2	50	18	0.00	0.0
November 3	50	24	0.00	0.0
November 4	53	25	0.00	0.0
November 5	68	38	0.00	0.0
November 6	69	32	0.00	0.0
November 7	66	38	0.00	0.0
November 8	62	37	0.00	0.0
November 9	58	30	0.00	0.0
November 10	51	39	0.13	0.0
November 11	53	33	0.00	0.0
November 12	33	29	0.03	0.3
November 13	51	27	0.01	0.0
November 14	44	29	0.00	0.0
November 15	51	31	0.00	0.0
November 16	68	33	0.00	0.0
November 17	48	29	0.00	0.0
November 18	40	18	0.00	0.0
November 19	52	19	0.00	0.0
November 20	52	34	0.00	0.0
November 21	43	18	0.00	0.0
November 22	47	20	0.00	0.0
November 23	68	26	0.00	0.0
November 24	53	30	0.00	0.0
November 25	31	16	0.00	0.0
November 26	54	24	0.00	0.0
November 27	55	31	0.00	0.0
November 28	49	16	0.00	0.0
November 29	70	29	0.00	0.0
November 30	56	32	0.00	0.0

December 2021 Sioux City Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
December 1	67	32	0.00	0.0
December 2	60	38	0.00	0.0
December 3	56	30	0.00	0.0
December 4	42	29	0.00	0.0
December 5	51	30	0.00	0.0
December 6	31	5	0.00	0.0
December 7	41	9	0.00	0.0
December 8	40	11	0.00	0.0
December 9	52	29	0.00	0.0
December 10	36	30	0.16	1.5
December 11	35	25	0.00	0.0
December 12	45	21	0.00	0.0
December 13	48	21	0.00	0.0
December 14	50	27	0.00	0.0
December 15	70	28	0.49	0.0
December 16	38	21	0.00	0.0
December 17	39	20	0.00	0.0
December 18	31	19	0.00	0.0
December 19	40	15	0.00	0.0
December 20	33	12	0.00	0.0
December 21	41	11	0.00	0.0
December 22	53	12	0.00	0.0
December 23	46	22	0.00	0.0
December 24	60	32	0.00	0.0
December 25	44	19	0.00	0.0
December 26	42	19	0.00	0.0
December 27	38	19	0.00	0.0
December 28	36	4	0.00	0.0
December 29	25	2	0.00	0.0
December 30	42	9	0.00	0.0
December 31	22	6	0.00	0.0

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Weather Station Details

Years	Station	Coordinates
1948–2024	Sioux City Gateway Airport	location