Weather on May 21
Richardson, TX
55 Years of Data
Avg High
85°F
Avg Low
65°F
Warmest
1996
86°F avg
Coldest
2015
59°F avg
About This Date
May 21st in Richardson, TX typically brings warm spring weather, with average highs around 85°F and lows near 65°F. Over 55 years of records, the warmest May 21st was in 1996 (86°F average), while the coldest was 2015 (59°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 21st dates historically, with the wettest May 21st recording 3.63" of rain. The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
Planning for May 21st in Richardson, TX? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Cooling Trend
0.5°F per decade on this date
| 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° | — | — |
| 2015coldest | 65° | 54° | 59° | 1.27" | — |
| 2014 | 87° | 69° | 78° | — | — |
| 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 | 99° | 74° | 86° | — | — |
| 2004 | 89° | 72° | 80° | — | — |
| 2003 | 69° | 63° | 66° | 0.08" | — |
| 2002 | 80° | 60° | 70° | — | — |
| 2001 | 81° | 58° | 69° | — | — |
| 2000 | 88° | 64° | 76° | — | — |
| 1999 | 87° | 71° | 79° | — | — |
| 1998 | 95° | 72° | 83° | — | — |
| 1997 | 68° | 60° | 64° | 0.38" | — |
| 1996warmest | 97° | 75° | 86° | — | — |
| 1995 | 85° | 64° | 74° | — | — |
| 1994 | 84° | 60° | 72° | — | — |
| 1993 | 82° | 65° | 73° | — | — |
| 1992 | 84° | 67° | 75° | 0.94" | — |
| 1991 | 85° | 71° | 78° | 0.05" | — |
| 1990 | 91° | 70° | 80° | 0.13" | — |
| 1989 | 87° | 70° | 78° | — | — |
| 1988 | 81° | 63° | 72° | — | — |
| 1987 | 90° | 71° | 80° | — | — |
| 1986 | 85° | 63° | 74° | — | — |
| 1985 | 78° | 62° | 70° | 2.41" | — |
| 1984 | 90° | 65° | 77° | — | — |
| 1983 | 81° | 60° | 70° | 2.84" | — |
| 1982 | 88° | 67° | 77° | 0.2" | — |
| 1981 | 82° | 60° | 71° | — | — |
| 1980 | 80° | 60° | 70° | — | — |
| 1979 | 84° | 62° | 73° | 1.68" | — |
| 1978 | 81° | 68° | 74° | 3.63" | — |
| 1977 | 90° | 63° | 76° | 0.84" | — |
| 1976 | 84° | 65° | 74° | — | — |
| 1975 | 90° | 68° | 79° | — | — |
| 1974 | 83° | 69° | 76° | 0.18" | — |
| 1973 | 94° | 71° | 82° | — | — |
| 1972 | 90° | 69° | 79° | — | — |
| 1971 | 87° | 66° | 77° | — | — |
55 years of data from RICHARDSON