Weather on September 21 at Great Smoky Mountains
Great Smoky Mountains National Park
Based on 55 years of data from Gatlinburg, TN
Elevation Note: Great Smoky Mountains sits at 4,900 ft. Expect temperatures 17°F cooler than the data shown below, which comes from Gatlinburg, TN at a lower elevation.
Planning Your Visit
September 21st in Great Smoky Mountains National Park (via Gatlinburg, TN) typically brings pleasant fall weather, with average highs around 78°F and lows near 53°F — a 25°F daily swing. Over 55 years of records, the warmest September 21st was in 1978 (74°F average), while the coldest was 1989 (52°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 21st dates historically, with the wettest September 21st recording 2.29" of rain. The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
Planning for September 21st in Great Smoky Mountains? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 79°F | 59°F | 0" | 0" |
| 2024 | 81°F | 58°F | 0" | 0" |
| 2023 | 73°F | 52°F | 0" | 0" |
| 2022 | 80°F | 57°F | 0" | 0" |
| 2021 | 68°F | 65°F | 0.76" | 0" |
| 2020 | 67°F | 41°F | 0" | 0" |
| 2019 | 79°F | 61°F | 0.28" | 0" |
| 2018 | 81°F | 62°F | 0.03" | 0" |
| 2017 | 81°F | 56°F | 0" | 0" |
| 2016 | 82°F | 56°F | 0" | 0" |
| 2015 | 77°F | 57°F | 0" | 0" |
| 2014 | 78°F | 57°F | 0" | 0" |
| 2013 | 78°F | 58°F | 0" | 0" |
| 2012 | 73°F | 48°F | 0" | 0" |
| 2011 | 58°F | 49°F | 0.25" | -- |
| 2010 | 86°F | 58°F | 0" | 0" |
| 2009 | 71°F | 66°F | 1.02" | 0" |
| 2008 | 78°F | 54°F | 0.03" | 0" |
| 2007 | 84°F | 51°F | 0" | 0" |
| 2006 | 67°F | 41°F | 0" | 0" |
| 2005 | 87°F | 59°F | 0" | 0" |
| 2004 | 75°F | 42°F | 0" | 0" |
| 2003 | 83°F | 55°F | 0" | 0" |
| 2002 | 83°F | 64°F | 2.08" | 0" |
| 2001 | 71°F | 53°F | 1.4" | 0" |
| 2000 | 86°F | 57°F | 1.8" | 0" |
| 1999 | 80°F | 53°F | 0" | 0" |
| 1998 | 88°F | 60°F | 0.41" | 0" |
| 1997 | 86°F | 59°F | 2.29" | 0" |
| 1996 | 77°F | 44°F | 0" | 0" |
| 1995 | 81°F | 50°F | 0.25" | 0" |
| 1994 | 75°F | 47°F | 0" | 0" |
| 1993 | 80°F | 49°F | 0.05" | 0" |
| 1992 | 81°F | 58°F | 0" | 0" |
| 1991 | 66°F | 44°F | 0" | 0" |
| 1990 | 78°F | 53°F | 0" | 0" |
| 1989 | 63°F | 41°F | 0" | 0" |
| 1988 | 82°F | 54°F | 0" | 0" |
| 1987 | 73°F | 48°F | 0" | -- |
| 1986 | 82°F | -- | 0.1" | 0" |
| 1985 | 84°F | 50°F | 0" | 0" |
| 1984 | 82°F | 48°F | 0" | 0" |
| 1983 | 78°F | 65°F | 0.23" | 0" |
| 1982 | 68°F | 51°F | 0" | 0" |
| 1981 | 71°F | 41°F | 0" | 0" |
| 1980 | 80°F | 63°F | 0.28" | 0" |
| 1979 | 72°F | 51°F | 0.05" | 0" |
| 1978 | 90°F | 58°F | 0" | 0" |
| 1977 | 80°F | 51°F | 0" | 0" |
| 1976 | 69°F | 53°F | 0.94" | 0" |
| 1975 | 84°F | 48°F | 0.76" | 0" |
| 1974 | 81°F | 53°F | 0" | 0" |
| 1973 | 77°F | 43°F | 0" | 0" |
| 1972 | 82°F | 52°F | 0" | 0" |
| 1971 | 83°F | 60°F | 2.29" | 0" |
September 21 at Nearby Parks
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