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Mount Rushmore September Weather

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

Typical Mount Rushmore September Weather 1991–2020
Average daily high	69.2 °F
Average daily low	49.6 °F
Average monthly precipitation	1.8 inches
Average monthly snow	0.8 inches
Daily chance of precipitation	25.8%
Daily chance of snow	0.69%

Mount Rushmore September Weather Records 1962–2024
Highest temperature	97 °F	September 6, 1978
Lowest temperature	19 °F	September 29, 1985
Highest daily low	75 °F	September 5, 1978
Lowest daily high	27 °F	September 23, 2000
Hottest average high temperature	78.4 °F	1979
Coldest average high temperature	55.1 °F	1965
Most daily precipitation	2.1 inches	September 1, 1963
Most monthly precipitation	6.0 inches	1986
Most daily snow	8.1 inches	September 11, 2014
Most monthly snow	8.3 inches	1965

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	74.9	55.1	95	35
September 2	74.7	55.0	94	36
September 3	74.5	54.7	92	36
September 4	74.1	54.4	94	31
September 5	73.6	54.0	95	33
September 6	73.1	53.5	97	35
September 7	72.6	53.0	95	29
September 8	72.1	52.4	90	21
September 9	71.6	52.0	94	25
September 10	71.2	51.6	91	31
September 11	70.8	51.2	86	25
September 12	70.5	50.8	90	24
September 13	70.0	50.4	89	26
September 14	69.6	50.0	87	27
September 15	69.3	49.7	84	30
September 16	69.0	49.4	89	24
September 17	68.6	49.1	92	25
September 18	68.1	48.6	87	25
September 19	67.5	48.0	85	27
September 20	66.9	47.5	84	23
September 21	66.3	47.1	85	21
September 22	65.8	46.6	84	24
September 23	65.4	46.3	86	24
September 24	65.0	45.9	84	25
September 25	64.5	45.4	85	19
September 26	64.1	45.0	88	20
September 27	63.6	44.6	84	21
September 28	63.2	44.1	84	20
September 29	62.8	43.7	83	19
September 30	62.3	43.3	85	20

Weather Station Details

Years	Station	Coordinates
1962–2024	Mt Rushmore Nmem	location