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Mammoth Cave National Park September Weather

Averages and records for weather in Mammoth Cave National Park, Kentucky in the month of September.

Typical Mammoth Cave National Park September Weather 1991–2020
Average daily high	83.8 °F
Average daily low	58.9 °F
Average monthly precipitation	3.9 inches
Daily chance of precipitation	26.3%

Mammoth Cave National Park September Weather Records 1934–2024
Highest temperature	106 °F	September 5, 1954
Lowest temperature	29 °F	September 29, 1942
Highest daily low	75 °F	September 10, 1991
Lowest daily high	52 °F	September 27, 1942
Hottest average high temperature	93.1 °F	2019
Coldest average high temperature	74.9 °F	1974
Most daily precipitation	6.5 inches	September 1, 2017
Most monthly precipitation	9.2 inches	1979

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	87.5	63.2	104	42
September 2	87.3	63.0	102	43
September 3	87.1	62.8	101	43
September 4	86.9	62.5	103	42
September 5	86.8	62.3	106	42
September 6	86.6	62.1	105	44
September 7	86.4	61.9	99	40
September 8	86.3	61.6	100	43
September 9	85.9	61.3	100	39
September 10	85.6	61.0	99	40
September 11	85.3	60.7	99	37
September 12	85.0	60.4	102	34
September 13	84.7	60.0	99	36
September 14	84.4	59.7	99	37
September 15	84.0	59.2	97	37
September 16	83.6	58.6	97	39
September 17	83.3	58.2	95	39
September 18	82.9	57.8	99	33
September 19	82.6	57.4	99	38
September 20	82.4	57.1	96	37
September 21	82.1	56.8	97	37
September 22	81.8	56.4	98	33
September 23	81.5	56.0	93	34
September 24	81.1	55.5	92	32
September 25	80.8	55.2	92	31
September 26	80.4	55.0	92	35
September 27	80.0	54.6	94	34
September 28	79.7	54.3	95	30
September 29	79.3	54.0	98	29
September 30	78.9	53.6	97	30

Weather Station Details

Years	Station	Coordinates
1934–2024	Mammoth Cave	location