Weather on May 21
Plano, TX
55 Years of Data
Avg High
84°F
Avg Low
63°F
Warmest
1990
82°F avg
Coldest
2003
59°F avg
About This Date
May 21st in Plano, TX typically brings warm spring weather, with average highs around 84°F and lows near 63°F. Over 55 years of records, the warmest May 21st was in 1990 (82°F average), while the coldest was 2003 (59°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 42% of May 21st dates historically, with the wettest May 21st recording 2.87" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Plano, TX? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 60° | 74° | — | — |
| 2024 | 88° | 74° | 81° | — | — |
| 2023 | 75° | 59° | 67° | — | — |
| 2022 | 90° | 62° | 76° | — | — |
| 2021 | 84° | 68° | 76° | 0.03" | — |
| 2020 | 85° | 68° | 76° | — | — |
| 2019 | 83° | 64° | 73° | 0.58" | — |
| 2018 | 82° | 62° | 72° | — | — |
| 2017 | 78° | 59° | 69° | 0.25" | — |
| 2016 | 83° | 63° | 73° | — | — |
| 2015 | 65° | 54° | 59° | 1.27" | — |
| 2014 | 86° | 67° | 76° | — | — |
| 2013 | 82° | 60° | 71° | 2.64" | — |
| 2012 | 87° | 64° | 76° | — | — |
| 2011 | 84° | 64° | 74° | 0.03" | — |
| 2010 | 88° | 66° | 77° | — | — |
| 2009 | 85° | 55° | 70° | — | — |
| 2008 | 86° | 67° | 76° | — | — |
| 2007 | 78° | 66° | 72° | 0.48" | — |
| 2006 | 90° | 69° | 79° | — | — |
| 2005 | 98° | 67° | 82° | — | — |
| 2004 | 88° | 72° | 80° | — | — |
| 2003coldest | 63° | 56° | 59° | 2.06" | — |
| 2002 | 79° | 51° | 65° | — | — |
| 2001 | 80° | 48° | 64° | 0.25" | — |
| 2000 | 87° | 58° | 72° | — | — |
| 1999 | 84° | 69° | 77° | — | — |
| 1998 | 92° | 70° | 81° | — | — |
| 1997 | 68° | 58° | 63° | 0.1" | — |
| 1996 | 93° | 72° | 82° | — | — |
| 1995 | 83° | 58° | 70° | — | — |
| 1994 | 82° | 54° | 68° | — | — |
| 1993 | 76° | 58° | 67° | 0.13" | — |
| 1992 | 82° | 66° | 74° | 0.28" | — |
| 1991 | 85° | 71° | 78° | 0.05" | — |
| 1990warmest | 91° | 74° | 82° | 0.08" | — |
| 1989 | 88° | 69° | 78° | — | — |
| 1988 | 80° | 62° | 71° | 0.38" | — |
| 1987 | 88° | 70° | 79° | 0.25" | — |
| 1986 | 83° | 52° | 67° | — | — |
| 1985 | 82° | 62° | 72° | 2.39" | — |
| 1984 | 87° | 62° | 75° | — | — |
| 1983 | 78° | 62° | 70° | 2.87" | — |
| 1982 | 86° | 68° | 77° | 1.45" | — |
| 1981 | 79° | 55° | 67° | — | — |
| 1980 | 80° | 60° | 70° | — | — |
| 1979 | 84° | 62° | 73° | 1.68" | — |
| 1978 | 86° | 64° | 75° | 2.79" | — |
| 1977 | 86° | 62° | 74° | 2.79" | — |
| 1976 | 83° | 60° | 71° | — | — |
| 1975 | 86° | 64° | 75° | 2.01" | — |
| 1974 | 85° | 68° | 76° | — | — |
| 1973 | 92° | 70° | 81° | — | — |
| 1972 | 88° | 58° | 73° | — | — |
| 1971 | 86° | 58° | 72° | — | — |
55 years of data from RICHARDSON