Weather on August 21
Mc Kinney, TX
55 Years of Data
Avg High
96°F
Avg Low
72°F
Warmest
2010
91°F avg
Coldest
1989
71°F avg
About This Date
August 21st in Mc Kinney, 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 2010 (91°F average), while the coldest was 1989 (71°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 11% of August 21st dates historically, with the wettest August 21st recording 3.86" 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 Mc Kinney, TX? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 75° | 87° | — | — |
| 2024 | 96° | 77° | 87° | — | — |
| 2023 | 104° | 76° | 90° | — | — |
| 2022 | 87° | 74° | 80° | 0.03" | — |
| 2021 | 95° | 76° | 85° | — | — |
| 2020 | 93° | 64° | 79° | — | — |
| 2019 | 98° | 77° | 88° | — | — |
| 2018 | 91° | 67° | 79° | — | — |
| 2017 | 92° | 76° | 84° | — | — |
| 2016 | 88° | 69° | 78° | — | — |
| 2015 | 92° | 71° | 81° | — | — |
| 2014 | 97° | 76° | 86° | — | — |
| 2013 | 96° | 72° | 84° | — | — |
| 2012 | 84° | 67° | 75° | — | — |
| 2011 | 102° | 80° | 91° | — | — |
| 2010warmest | 102° | 80° | 91° | — | — |
| 2009 | 92° | 67° | 79° | 3.86" | — |
| 2008 | 90° | 67° | 78° | — | — |
| 2007 | 93° | 73° | 83° | — | — |
| 2006 | 103° | 77° | 90° | — | — |
| 2005 | 98° | 72° | 85° | — | — |
| 2004 | 82° | 67° | 74° | — | — |
| 2003 | 97° | 74° | 85° | — | — |
| 2002 | 95° | 77° | 86° | — | — |
| 2001 | 97° | 70° | 83° | — | — |
| 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 | 100° | 74° | 87° | — | — |
| 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 MCKINNEY MUNI AP