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Yankton September Weather

Averages and records for weather in Yankton, South Dakota in the month of September.

Typical Yankton September Weather 1991–2020
Average daily high	77.4 °F
Average daily low	51.0 °F
Average monthly precipitation	2.8 inches
Average monthly snow	none
Daily chance of precipitation	24.8%
Daily chance of snow	0%

Yankton September Weather Records 1932–2024
Highest temperature	105 °F	September 18, 1940
Lowest temperature	23 °F	September 30, 1984
Highest daily low	81 °F	September 15, 1939
Lowest daily high	39 °F	September 29, 1985
Hottest average high temperature	85.4 °F	1998
Coldest average high temperature	62.8 °F	1965
Most daily precipitation	3.5 inches	September 23, 2010
Most monthly precipitation	7.4 inches	1973
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
September 1	82.3	57.7	95	38
September 2	82.0	57.3	101	41
September 3	81.9	57.1	101	30
September 4	81.7	56.8	99	30
September 5	81.4	56.5	100	37
September 6	81.0	56.1	99	37
September 7	80.7	55.6	102	39
September 8	80.3	55.1	102	38
September 9	79.8	54.6	99	37
September 10	79.3	54.1	99	37
September 11	78.9	53.6	99	33
September 12	78.5	53.1	100	33
September 13	78.2	52.7	102	36
September 14	77.8	52.1	102	35
September 15	77.4	51.6	92	29
September 16	77.1	51.1	100	30
September 17	76.8	50.7	97	36
September 18	76.5	50.2	105	34
September 19	76.0	49.6	101	29
September 20	75.5	49.1	100	29
September 21	74.9	48.6	95	31
September 22	74.4	48.2	96	30
September 23	74.0	47.8	93	28
September 24	73.6	47.4	96	29
September 25	73.2	47.0	91	30
September 26	72.7	46.4	94	24
September 27	72.3	45.9	97	23
September 28	72.0	45.5	97	25
September 29	71.5	45.0	90	24
September 30	71.0	44.6	92	23

Weather Station Details

Years	Station	Coordinates
1932–2024	Yankton 2 E	location