Weather on September 20 at Mammoth Cave
Mammoth Cave National Park
Based on 55 years of data from Bowling Green, KY
Planning Your Visit
September 20th in Mammoth Cave National Park (via Bowling Green, KY) typically brings warm fall weather, with average highs around 82°F and lows near 59°F. Over 55 years of records, the warmest September 20th was in 2018 (82°F average), while the coldest was 1991 (54°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 38% of September 20th dates historically, with the wettest September 20th recording 3.94" of rain. The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for September 20th in Mammoth Cave? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 94°F | 62°F | 0" | 0" |
| 2024 | 95°F | 65°F | 0" | 0" |
| 2023 | 85°F | 54°F | 0" | 0" |
| 2022 | 95°F | 70°F | 0" | -- |
| 2021 | 76°F | 67°F | 1.42" | 0" |
| 2020 | 77°F | 51°F | 0" | 0" |
| 2019 | 89°F | 69°F | 0" | 0" |
| 2018 | 95°F | 70°F | 0" | 0" |
| 2017 | 89°F | 65°F | 0" | 0" |
| 2016 | 89°F | 60°F | 0" | 0" |
| 2015 | 80°F | 57°F | 0" | 0" |
| 2014 | 86°F | 63°F | 0.58" | 0" |
| 2013 | 85°F | 67°F | 2.18" | 0" |
| 2012 | 80°F | 46°F | 0" | 0" |
| 2011 | 75°F | 62°F | 0.13" | 0" |
| 2010 | 90°F | 61°F | 0" | 0" |
| 2009 | 84°F | 71°F | 0.25" | 0" |
| 2008 | 82°F | 63°F | 0" | 0" |
| 2007 | 89°F | 57°F | 0" | 0" |
| 2006 | 66°F | 45°F | 0" | 0" |
| 2005 | 88°F | 67°F | 0.05" | 0" |
| 2004 | 81°F | 48°F | 0" | 0" |
| 2003 | 75°F | 50°F | 0" | 0" |
| 2002 | 90°F | 67°F | 2.84" | 0" |
| 2001 | 76°F | 55°F | 0" | 0" |
| 2000 | 87°F | 56°F | 3.25" | 0" |
| 1999 | 81°F | 60°F | 3.25" | 0" |
| 1998 | 77°F | 69°F | 0.76" | 0" |
| 1997 | 83°F | 66°F | -- | 0" |
| 1996 | 78°F | 49°F | -- | 0" |
| 1995 | 76°F | 67°F | 0.03" | 0" |
| 1994 | 82°F | 48°F | 0" | 0" |
| 1993 | 80°F | 56°F | 0" | 0" |
| 1992 | 82°F | 55°F | 0.99" | 0" |
| 1991 | 65°F | 43°F | 0" | 0" |
| 1990 | 78°F | 60°F | 0" | 0" |
| 1989 | 82°F | 54°F | 0" | 0" |
| 1988 | 80°F | 57°F | 0.03" | 0" |
| 1987 | 80°F | 54°F | 0" | 0" |
| 1986 | 86°F | 63°F | 0.28" | 0" |
| 1985 | 85°F | 52°F | 0" | 0" |
| 1984 | 82°F | 50°F | 0" | 0" |
| 1983 | 83°F | 53°F | 0.94" | 0" |
| 1982 | 73°F | 57°F | 0.51" | 0" |
| 1981 | 76°F | 49°F | 0" | 0" |
| 1980 | 90°F | 69°F | 0" | 0" |
| 1979 | 73°F | 57°F | 3.94" | 0" |
| 1978 | 93°F | 68°F | 0" | 0" |
| 1977 | 76°F | 58°F | 0" | 0" |
| 1976 | 80°F | 61°F | 0.05" | 0" |
| 1975 | 74°F | 56°F | 0.74" | 0" |
| 1974 | 83°F | 64°F | 1.14" | 0" |
| 1973 | 75°F | 53°F | 0" | 0" |
| 1972 | 91°F | 63°F | 0" | 0" |
| 1971 | 71°F | 57°F | 0.41" | 0" |