Weather on September 21 at Dry Tortugas
Dry Tortugas National Park
Based on 55 years of data from Key West, FL
Planning Your Visit
September 21st in Dry Tortugas National Park (via Key West, FL) typically brings warm fall weather, with average highs around 89°F and lows near 78°F. Over 55 years of records, the warmest September 21st was in 2000 (87°F average), while the coldest was 2012 (80°F) — a 7°F range across recorded history. Rain or other precipitation has occurred on about 53% of September 21st dates historically, with the wettest September 21st recording 1.47" of rain. The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Dry Tortugas? 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 | 91°F | 79°F | 0.33" | -- |
| 2024 | 94°F | 77°F | 0.81" | -- |
| 2023 | 91°F | 76°F | 0.58" | -- |
| 2022 | 94°F | 79°F | 0.23" | -- |
| 2021 | 91°F | 78°F | 1.02" | -- |
| 2020 | 93°F | 80°F | 0.05" | -- |
| 2019 | 87°F | 78°F | 0.71" | -- |
| 2018 | 89°F | 77°F | 1.47" | -- |
| 2017 | 92°F | 80°F | 0" | 0" |
| 2016 | 90°F | 82°F | 0" | -- |
| 2015 | 87°F | 80°F | 0" | -- |
| 2014 | 85°F | 77°F | 0.03" | -- |
| 2013 | 84°F | 75°F | 0" | -- |
| 2012 | 87°F | 74°F | 1.12" | -- |
| 2011 | 87°F | 81°F | 0.1" | -- |
| 2010 | 87°F | 77°F | 0.13" | 0" |
| 2009 | 90°F | 81°F | 0.13" | 0" |
| 2008 | 87°F | 80°F | 0" | 0" |
| 2007 | 89°F | 76°F | 0" | 0" |
| 2006 | 88°F | 80°F | 0.05" | 0" |
| 2005 | 87°F | 78°F | 0.03" | 0" |
| 2004 | 90°F | 75°F | 0" | -- |
| 2003 | 90°F | 82°F | 0" | -- |
| 2002 | 86°F | 78°F | 0.58" | 0" |
| 2001 | 89°F | 78°F | 0" | 0" |
| 2000 | 91°F | 83°F | 0" | -- |
| 1999 | 84°F | 78°F | 0.13" | -- |
| 1998 | 89°F | 80°F | 0" | 0" |
| 1997 | 88°F | 75°F | 0" | 0" |
| 1996 | 90°F | 81°F | 0" | 0" |
| 1995 | 89°F | 77°F | 0.13" | 0" |
| 1994 | 89°F | 77°F | 0.05" | 0" |
| 1993 | 90°F | 79°F | 0.15" | 0" |
| 1992 | 89°F | 79°F | 0" | 0" |
| 1991 | 90°F | 79°F | 0.08" | 0" |
| 1990 | 89°F | 80°F | 0" | 0" |
| 1989 | 89°F | 81°F | 0" | 0" |
| 1988 | 88°F | 78°F | 0.33" | 0" |
| 1987 | 90°F | 80°F | 0" | 0" |
| 1986 | 88°F | 76°F | 0.79" | 0" |
| 1985 | 89°F | 78°F | 0" | 0" |
| 1984 | 87°F | 76°F | 0.08" | 0" |
| 1983 | 89°F | 79°F | 0" | 0" |
| 1982 | 88°F | 81°F | 0" | 0" |
| 1981 | 89°F | 75°F | 0" | 0" |
| 1980 | 88°F | 81°F | 0" | 0" |
| 1979 | 88°F | 82°F | 0" | 0" |
| 1978 | 88°F | 80°F | 0.3" | 0" |
| 1977 | 89°F | 80°F | 0" | 0" |
| 1976 | 88°F | 79°F | 0" | 0" |
| 1975 | 88°F | 80°F | 0.03" | 0" |
| 1974 | 89°F | 76°F | 1.24" | 0" |
| 1973 | 89°F | 74°F | 0.81" | 0" |
| 1972 | 86°F | 76°F | 0.25" | 0" |
| 1971 | 88°F | 77°F | 0" | 0" |