Weather on August 21
Plano, TX
55 Years of Data
Avg High
96°F
Avg Low
72°F
Warmest
2023
94°F avg
Coldest
1989
71°F avg
About This Date
August 21st in Plano, TX typically brings hot summer weather, with average highs around 96°F and lows near 72°F. Over 55 years of records, the warmest August 21st was in 2023 (94°F average), while the coldest was 1989 (71°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 15% of August 21st dates historically, with the wettest August 21st recording 6.22" 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 August 21st in Plano, TX? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 96° | 74° | 85° | — | — |
| 2024 | 97° | 76° | 86° | — | — |
| 2023warmest | 107° | 81° | 94° | — | — |
| 2022 | 86° | 73° | 80° | 1.57" | — |
| 2021 | 94° | 77° | 85° | — | — |
| 2020 | 93° | 70° | 81° | — | — |
| 2019 | 97° | 77° | 87° | — | — |
| 2018 | 91° | 71° | 81° | — | — |
| 2017 | 93° | 77° | 85° | — | — |
| 2016 | 88° | 70° | 79° | 0.03" | — |
| 2015 | 90° | 59° | 74° | — | — |
| 2014 | 98° | 77° | 88° | — | — |
| 2013 | 95° | 73° | 84° | — | — |
| 2012 | 80° | 67° | 73° | 0.05" | — |
| 2011 | 101° | 84° | 92° | — | — |
| 2010 | 102° | 80° | 91° | — | — |
| 2009 | 91° | 68° | 80° | 6.22" | — |
| 2008 | 90° | 68° | 79° | — | — |
| 2007 | 92° | 74° | 83° | — | — |
| 2006 | 103° | 83° | 93° | — | — |
| 2005 | 98° | 72° | 85° | — | — |
| 2004 | 82° | 67° | 74° | — | — |
| 2003 | 97° | 74° | 85° | — | — |
| 2002 | 95° | 77° | 86° | — | — |
| 2001 | 97° | 73° | 85° | — | — |
| 2000 | 101° | 70° | 85° | — | — |
| 1999 | 98° | 66° | 82° | — | — |
| 1998 | 99° | 75° | 87° | — | — |
| 1997 | 92° | 85° | 88° | 0.05" | — |
| 1996 | 92° | 70° | 81° | — | — |
| 1995 | 102° | 73° | 88° | 1.14" | — |
| 1994 | 99° | 67° | 83° | 2.29" | — |
| 1993 | 101° | 73° | 87° | — | — |
| 1992 | 89° | 63° | 76° | — | — |
| 1991 | 95° | 75° | 85° | — | — |
| 1990 | 104° | 80° | 92° | — | — |
| 1989coldest | 94° | 49° | 71° | — | — |
| 1988 | 100° | 77° | 89° | — | — |
| 1987 | 101° | 76° | 88° | — | — |
| 1986 | 97° | 75° | 86° | — | — |
| 1985 | 102° | 74° | 88° | — | — |
| 1984 | 98° | 78° | 88° | — | — |
| 1983 | 95° | 73° | 84° | — | — |
| 1982 | 97° | 67° | 82° | — | — |
| 1981 | 91° | 62° | 77° | — | — |
| 1980 | 104° | 70° | 87° | — | — |
| 1979 | 93° | 66° | 80° | 1.7" | — |
| 1978 | 100° | 73° | 87° | — | — |
| 1977 | 85° | 75° | 80° | — | — |
| 1976 | 94° | 63° | 78° | — | — |
| 1975 | 96° | 71° | 84° | — | — |
| 1974 | 97° | 70° | 83° | — | — |
| 1973 | 99° | 63° | 81° | — | — |
| 1972 | 100° | 73° | 87° | — | — |
| 1971 | 92° | 72° | 82° | — | — |
55 years of data from RICHARDSON