Weather on May 21
Port Saint Lucie, FL
55 Years of Data
Avg High
85°F
Avg Low
70°F
Warmest
2025
84°F avg
Coldest
2000
64°F avg
About This Date
May 21st in Port Saint Lucie, FL typically brings warm spring weather, with average highs around 85°F and lows near 70°F. Over 55 years of records, the warmest May 21st was in 2025 (84°F average), while the coldest was 2000 (64°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 31% of May 21st dates historically, with the wettest May 21st recording 4.55" of rain. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Port Saint Lucie, FL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 91° | 77° | 84° | — | — |
| 2024 | — | 73° | — | 0.08" | — |
| 2023 | 85° | 77° | 81° | — | — |
| 2022 | 85° | 70° | 77° | 4.55" | — |
| 2021 | 81° | 74° | 77° | — | — |
| 2020 | 94° | 70° | 82° | — | — |
| 2019 | 84° | 74° | 79° | — | — |
| 2018 | 83° | 69° | 76° | 0.13" | — |
| 2017 | 84° | 76° | 80° | — | — |
| 2016 | 89° | 72° | 80° | 4.17" | — |
| 2015 | 89° | 73° | 81° | — | — |
| 2014 | 82° | 75° | 79° | — | — |
| 2013 | 79° | 70° | 74° | 3.94" | — |
| 2012 | 83° | 73° | 78° | — | — |
| 2011 | 82° | 76° | 79° | — | — |
| 2010 | 88° | 70° | 79° | — | — |
| 2009 | 83° | 67° | 75° | 0.89" | — |
| 2008 | 91° | 74° | 82° | — | — |
| 2007 | 85° | 73° | 79° | — | — |
| 2006 | 86° | 69° | 78° | — | — |
| 2005 | 88° | 71° | 79° | — | — |
| 2004 | 85° | 71° | 78° | — | — |
| 2003 | 83° | 77° | 80° | — | — |
| 2002 | 80° | 70° | 75° | — | — |
| 2001 | 87° | 73° | 80° | — | — |
| 2000coldest | 65° | 63° | 64° | — | — |
| 1999 | 84° | 70° | 77° | 0.46" | — |
| 1998 | 86° | 71° | 79° | — | — |
| 1997 | 92° | 70° | 81° | — | — |
| 1996 | 80° | 72° | 76° | 1.52" | — |
| 1995 | 87° | 67° | 77° | 0.84" | — |
| 1994 | 80° | 61° | 70° | 0.56" | — |
| 1993 | 86° | 67° | 76° | 0.25" | — |
| 1992 | 84° | 70° | 77° | 0.25" | — |
| 1991 | 82° | 75° | 79° | — | — |
| 1990 | 88° | 70° | 79° | — | — |
| 1989 | 90° | 66° | 78° | — | — |
| 1988 | 85° | 75° | 80° | — | — |
| 1987 | 84° | 67° | 75° | — | — |
| 1986 | 90° | 71° | 80° | 0.3" | — |
| 1985 | 90° | 71° | 80° | — | — |
| 1984 | 83° | 67° | 75° | 0.46" | — |
| 1983 | 84° | 73° | 79° | — | — |
| 1982 | 81° | 67° | 74° | 2.87" | — |
| 1981 | 87° | 65° | 76° | 1.35" | — |
| 1980 | 86° | 73° | 80° | 0.56" | — |
| 1979 | 87° | 64° | 76° | — | — |
| 1978 | 84° | 64° | 74° | — | — |
| 1977 | 83° | 73° | 78° | — | — |
| 1976 | 83° | 73° | 78° | — | — |
| 1975 | 87° | 71° | 79° | — | — |
| 1974 | 82° | 73° | 78° | — | — |
| 1973 | 92° | 69° | 80° | — | — |
| 1972 | 85° | 63° | 74° | — | — |
| 1971 | 91° | 62° | 77° | — | — |
55 years of data from NETTLES IS