Weather on August 21
Port Saint Lucie, FL
55 Years of Data
Avg High
90°F
Avg Low
76°F
Warmest
1993
88°F avg
Coldest
2003
78°F avg
About This Date
August 21st in Port Saint Lucie, FL typically brings hot summer weather, with average highs around 90°F and lows near 76°F. Over 55 years of records, the warmest August 21st was in 1993 (88°F average), while the coldest was 2003 (78°F) — a 10°F range across recorded history. Rain or other precipitation has occurred on about 55% of August 21st dates historically, with the wettest August 21st recording 5.79" of rain. The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Port Saint Lucie, FL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 90° | 80° | 85° | 0.18" | — |
| 2024 | 95° | 76° | 85° | 2.01" | — |
| 2023 | 88° | 78° | 83° | 0.48" | — |
| 2022 | 89° | 79° | 84° | 0.15" | — |
| 2021 | 91° | 77° | 84° | — | — |
| 2020 | 87° | 72° | 79° | 5.79" | — |
| 2019 | 89° | 76° | 82° | 0.81" | — |
| 2018 | 89° | 76° | 82° | 0.71" | — |
| 2017 | 90° | 77° | 83° | 1.27" | — |
| 2016 | 92° | 79° | 85° | — | — |
| 2015 | 92° | 78° | 85° | — | — |
| 2014 | 90° | 82° | 86° | — | — |
| 2013 | 86° | 77° | 82° | 0.46" | — |
| 2012 | 87° | 77° | 82° | 1.78" | — |
| 2011 | 86° | 78° | 82° | 0.48" | — |
| 2010 | 91° | 75° | 83° | — | — |
| 2009 | 92° | 78° | 85° | — | — |
| 2008 | 84° | 78° | 81° | 0.71" | — |
| 2007 | 91° | 81° | 86° | — | — |
| 2006 | 90° | 73° | 81° | 2.49" | — |
| 2005 | 92° | 77° | 84° | — | — |
| 2004 | 86° | 80° | 83° | — | — |
| 2003coldest | 82° | 74° | 78° | 0.51" | — |
| 2002 | 89° | 73° | 81° | — | — |
| 2001 | 92° | 77° | 84° | — | — |
| 2000 | 90° | 75° | 82° | 0.71" | — |
| 1999 | 91° | 73° | 82° | 2.79" | — |
| 1998 | 83° | 75° | 79° | 3.53" | — |
| 1997 | 94° | 72° | 83° | — | — |
| 1996 | 91° | 79° | 85° | — | — |
| 1995 | 92° | 73° | 82° | 3.81" | — |
| 1994 | 92° | 75° | 83° | 0.66" | — |
| 1993warmest | 99° | 78° | 88° | — | — |
| 1992 | 90° | 75° | 82° | 0.25" | — |
| 1991 | 96° | 73° | 85° | — | — |
| 1990 | 90° | 74° | 82° | — | — |
| 1989 | 88° | 77° | 82° | 0.51" | — |
| 1988 | 92° | 75° | 83° | 1.47" | — |
| 1987 | 91° | 74° | 82° | — | — |
| 1986 | 86° | 71° | 79° | 0.33" | — |
| 1985 | 89° | 73° | 81° | 0.18" | — |
| 1984 | 90° | 74° | 82° | 3.94" | — |
| 1983 | 94° | 79° | 86° | — | — |
| 1982 | 93° | 72° | 82° | 0.97" | — |
| 1981 | 87° | 72° | 79° | — | — |
| 1980 | 92° | 77° | 84° | — | — |
| 1979 | 90° | 77° | 83° | — | — |
| 1978 | 91° | 74° | 82° | — | — |
| 1977 | 96° | 72° | 84° | — | — |
| 1976 | 92° | 76° | 84° | 0.03" | — |
| 1975 | 89° | 69° | 79° | — | — |
| 1974 | 90° | 75° | 82° | 0.05" | — |
| 1973 | 83° | 77° | 80° | 0.2" | — |
| 1972 | 94° | 69° | 81° | 0.71" | — |
| 1971 | 89° | — | — | — | — |
55 years of data from NETTLES IS