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Sioux City May Weather

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

Typical Sioux City May Weather 1991–2020
Average daily high	72.9 °F
Average daily low	49.1 °F
Average monthly precipitation	3.9 inches
Average monthly snow	0.0 inches
Daily chance of precipitation	38.8%
Daily chance of snow	0.11%

Sioux City May Weather Records 1948–2024
Highest temperature	106 °F	May 14, 2013
Lowest temperature	25 °F	May 13, 1997
Highest daily low	74 °F	May 28, 2006
Lowest daily high	41 °F	May 2, 1954
Hottest average high temperature	80.6 °F	1988
Coldest average high temperature	66.0 °F	1996
Most daily precipitation	2.8 inches	May 25, 2011
Most monthly precipitation	8.5 inches	1959
Most daily snow	1.4 inches	May 1, 2013
Most monthly snow	1.4 inches	2013

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

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
May 1	67.3	43.0	93	25
May 2	67.8	43.4	91	28
May 3	68.2	43.7	94	25
May 4	68.7	44.0	93	29
May 5	69.1	44.4	95	29
May 6	69.4	44.8	92	32
May 7	69.8	45.3	94	30
May 8	70.0	45.8	91	29
May 9	70.3	46.2	95	30
May 10	70.6	46.7	96	30
May 11	70.9	47.1	92	29
May 12	71.3	47.5	94	29
May 13	71.7	47.9	95	25
May 14	72.1	48.3	106	33
May 15	72.6	48.7	101	32
May 16	73.0	49.1	91	28
May 17	73.4	49.6	97	30
May 18	73.8	50.0	96	34
May 19	74.1	50.4	97	32
May 20	74.3	50.7	94	32
May 21	74.6	51.0	94	35
May 22	74.9	51.3	92	30
May 23	75.3	51.7	94	37
May 24	75.6	52.1	95	37
May 25	75.9	52.5	102	39
May 26	76.4	52.8	97	34
May 27	76.9	53.3	102	34
May 28	77.3	53.8	98	38
May 29	77.5	54.2	95	38
May 30	77.8	54.5	94	43
May 31	78.0	55.0	92	42

Weather Station Details

Years	Station	Coordinates
1948–2024	Sioux City Gateway Airport	location