Weather on March 21 at Biscayne
Biscayne National Park
Based on 56 years of data from Miami, FL
Planning Your Visit
March 21st in Biscayne National Park (via Miami, FL) typically brings pleasant spring weather, with average highs around 78°F and lows near 66°F. Over 56 years of records, the warmest March 21st was in 2003 (83°F average), while the coldest was 1971 (59°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 20% of March 21st dates historically, with the wettest March 21st recording 2.44" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for March 21st in Biscayne? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 80°F | 60°F | 0" | -- |
| 2025 | 86°F | 60°F | 0" | -- |
| 2024 | 78°F | 61°F | 0" | -- |
| 2023 | 75°F | 59°F | 0" | -- |
| 2022 | 84°F | 71°F | 0" | -- |
| 2021 | -- | 56°F | 0" | -- |
| 2020 | 82°F | 75°F | 0" | -- |
| 2019 | 76°F | 63°F | 0" | -- |
| 2018 | 88°F | 71°F | 0" | -- |
| 2017 | 79°F | 63°F | 0" | -- |
| 2016 | 84°F | 66°F | 0.25" | -- |
| 2015 | 81°F | 68°F | 0" | -- |
| 2014 | 80°F | 64°F | 0" | -- |
| 2013 | 80°F | 66°F | 0" | -- |
| 2012 | 79°F | 73°F | 0" | -- |
| 2011 | 78°F | 64°F | 0.25" | -- |
| 2010 | 72°F | 54°F | 0" | 0" |
| 2009 | 78°F | 66°F | 0.94" | 0" |
| 2008 | 75°F | 71°F | 1.52" | -- |
| 2007 | 75°F | 69°F | 0" | -- |
| 2006 | 83°F | 73°F | 0" | 0" |
| 2005 | 76°F | 62°F | 0" | 0" |
| 2004 | 78°F | 71°F | 0" | 0" |
| 2003 | 87°F | 79°F | 0.05" | 0" |
| 2002 | 82°F | 70°F | 0" | 0" |
| 2001 | 78°F | 58°F | 0" | 0" |
| 2000 | 81°F | 71°F | 0" | 0" |
| 1999 | 79°F | 71°F | 0" | 0" |
| 1998 | 75°F | 64°F | 0" | 0" |
| 1997 | 78°F | 71°F | 2.03" | 0" |
| 1996 | 67°F | 51°F | 0" | 0" |
| 1995 | 79°F | 67°F | 0" | 0" |
| 1994 | 83°F | 72°F | 0" | 0" |
| 1993 | 78°F | 68°F | 0.66" | 0" |
| 1992 | 71°F | 55°F | 0" | 0" |
| 1991 | 77°F | 70°F | 0" | 0" |
| 1990 | 73°F | 62°F | 0" | 0" |
| 1989 | 78°F | 73°F | 0" | 0" |
| 1988 | 69°F | 53°F | 0" | 0" |
| 1987 | 78°F | 69°F | 0" | 0" |
| 1986 | 77°F | 58°F | 2.44" | 0" |
| 1985 | 74°F | 69°F | 0.05" | 0" |
| 1984 | 78°F | 63°F | 0.3" | 0" |
| 1983 | 84°F | 62°F | 0" | 0" |
| 1982 | 82°F | 75°F | 0" | 0" |
| 1981 | 70°F | 51°F | 0" | 0" |
| 1980 | 90°F | 70°F | 0" | 0" |
| 1979 | 81°F | 64°F | 0" | 0" |
| 1978 | 75°F | 72°F | 0" | 0" |
| 1977 | 81°F | 76°F | 0" | 0" |
| 1976 | 79°F | 74°F | 0" | 0" |
| 1975 | 76°F | 60°F | 0" | 0" |
| 1974 | 79°F | 73°F | 0" | 0" |
| 1973 | 80°F | 71°F | 1.55" | 0" |
| 1972 | 78°F | 72°F | 0" | 0" |
| 1971 | 70°F | 49°F | 0" | 0" |