Weather on September 18 at Mammoth Cave
Mammoth Cave National Park
Based on 55 years of data from Bowling Green, KY
Planning Your Visit
September 18th in Mammoth Cave National Park (via Bowling Green, KY) typically brings warm fall weather, with average highs around 81°F and lows near 58°F. Over 55 years of records, the warmest September 18th was in 1978 (81°F average), while the coldest was 1981 (54°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 18th dates historically, with the wettest September 18th recording 2.46" of rain. The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Mammoth Cave? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 92°F | 58°F | 0" | 0" |
| 2024 | 87°F | 68°F | 0" | 0" |
| 2023 | 78°F | 56°F | 0" | 0" |
| 2022 | 87°F | 59°F | 0" | -- |
| 2021 | 78°F | 69°F | 1.32" | 0" |
| 2020 | 74°F | 56°F | 0" | 0" |
| 2019 | 92°F | 64°F | 0" | 0" |
| 2018 | 93°F | 70°F | 0" | 0" |
| 2017 | 89°F | 61°F | 1.45" | 0" |
| 2016 | 87°F | 71°F | 0" | 0" |
| 2015 | 89°F | 57°F | 0" | 0" |
| 2014 | 77°F | 52°F | 0" | 0" |
| 2013 | 81°F | 63°F | 0" | 0" |
| 2012 | 71°F | 51°F | 0.15" | 0" |
| 2011 | 83°F | 61°F | 0.03" | 0" |
| 2010 | 88°F | 54°F | 0" | 0" |
| 2009 | 83°F | 69°F | 0.33" | 0" |
| 2008 | 87°F | 53°F | 0" | 0" |
| 2007 | 86°F | 58°F | 0" | 0" |
| 2006 | 79°F | 58°F | 1.57" | 0" |
| 2005 | 78°F | 52°F | 0" | 0" |
| 2004 | 79°F | 52°F | 0" | 0" |
| 2003 | 82°F | 54°F | 0" | 0" |
| 2002 | 87°F | 68°F | 0.51" | 0" |
| 2001 | 82°F | 61°F | 0.33" | 0" |
| 2000 | 82°F | 47°F | 0" | 0" |
| 1999 | 83°F | 45°F | 0" | 0" |
| 1998 | 92°F | 68°F | 0.51" | 0" |
| 1997 | 86°F | 59°F | -- | 0" |
| 1996 | 73°F | 50°F | -- | 0" |
| 1995 | 75°F | 55°F | 0" | 0" |
| 1994 | 78°F | 56°F | 0" | 0" |
| 1993 | 74°F | 54°F | 0" | 0" |
| 1992 | 81°F | 68°F | 1.7" | 0" |
| 1991 | 90°F | 57°F | 0.53" | 0" |
| 1990 | 77°F | 51°F | 0" | 0" |
| 1989 | 79°F | 51°F | 0" | 0" |
| 1988 | 78°F | 60°F | 0" | 0" |
| 1987 | 81°F | 63°F | 0" | 0" |
| 1986 | 75°F | 65°F | 0.43" | 0" |
| 1985 | 83°F | 51°F | 0" | 0" |
| 1984 | 76°F | 55°F | 0" | 0" |
| 1983 | 91°F | 67°F | 0" | 0" |
| 1982 | 73°F | 56°F | 0.3" | 0" |
| 1981 | 63°F | 46°F | 0.03" | 0" |
| 1980 | 76°F | 53°F | 0" | 0" |
| 1979 | 73°F | 64°F | 0" | 0" |
| 1978 | 91°F | 72°F | 0" | 0" |
| 1977 | 89°F | 66°F | 0" | 0" |
| 1976 | 81°F | 52°F | 0" | 0" |
| 1975 | 74°F | 58°F | 2.46" | 0" |
| 1974 | 83°F | 51°F | 0" | 0" |
| 1973 | 68°F | 48°F | 0" | 0" |
| 1972 | 88°F | 67°F | 0" | 0" |
| 1971 | 79°F | 61°F | 0" | 0" |