Weather on August 21
Lewisville, TX
55 Years of Data
Avg High
95°F
Avg Low
73°F
Warmest
2011
96°F avg
Coldest
2015
71°F avg
About This Date
August 21st in Lewisville, TX typically brings hot summer weather, with average highs around 95°F and lows near 73°F. Over 55 years of records, the warmest August 21st was in 2011 (96°F average), while the coldest was 2015 (71°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 16% of August 21st dates historically, with the wettest August 21st recording 3.81" 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 Lewisville, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 102° | 74° | 88° | 1.02" | — |
| 2024 | 103° | 78° | 90° | — | — |
| 2023 | 109° | 79° | 94° | — | — |
| 2022 | 94° | 76° | 85° | — | — |
| 2021 | 94° | 77° | 85° | 1.78" | — |
| 2020 | 92° | 68° | 80° | — | — |
| 2019 | 100° | 80° | 90° | — | — |
| 2018 | 91° | 71° | 81° | — | — |
| 2017 | 93° | 78° | 86° | — | — |
| 2016 | 82° | 68° | 75° | 0.89" | — |
| 2015coldest | 77° | 65° | 71° | — | — |
| 2014 | 96° | 78° | 87° | — | — |
| 2013 | 97° | 70° | 83° | — | — |
| 2012 | 90° | 66° | 78° | 0.1" | — |
| 2011warmest | 107° | 84° | 96° | — | — |
| 2010 | 100° | 81° | 90° | — | — |
| 2009 | 99° | 65° | 82° | 3.81" | — |
| 2008 | 82° | 69° | 76° | — | — |
| 2007 | 94° | 76° | 85° | — | — |
| 2006 | 104° | 81° | 92° | — | — |
| 2005 | 97° | 74° | 85° | — | — |
| 2004 | 81° | 67° | 74° | — | — |
| 2003 | 101° | 79° | 90° | — | — |
| 2002 | 98° | 78° | 88° | — | — |
| 2001 | 97° | 78° | 87° | — | — |
| 2000 | 101° | 79° | 90° | — | — |
| 1999 | 101° | 68° | 84° | — | — |
| 1998 | 99° | 75° | 87° | — | — |
| 1997 | 95° | 71° | 83° | — | — |
| 1996 | 92° | 70° | 81° | — | — |
| 1995 | 100° | 76° | 88° | — | — |
| 1994 | 85° | 67° | 76° | — | — |
| 1993 | 101° | 78° | 89° | — | — |
| 1992 | 89° | 65° | 77° | — | — |
| 1991 | 85° | 72° | 78° | 1.07" | — |
| 1990 | 100° | 73° | 87° | — | — |
| 1989 | 93° | 75° | 84° | — | — |
| 1988 | 100° | 76° | 88° | — | — |
| 1987 | 99° | 79° | 89° | — | — |
| 1986 | 95° | 76° | 85° | — | — |
| 1985 | 100° | 78° | 89° | 0.76" | — |
| 1984 | 98° | 75° | 87° | — | — |
| 1983 | 93° | 73° | 83° | — | — |
| 1982 | 96° | 67° | 81° | — | — |
| 1981 | 88° | 64° | 76° | — | — |
| 1980 | 102° | 73° | 88° | — | — |
| 1979 | 93° | 66° | 80° | 2.03" | — |
| 1978 | 99° | 74° | 86° | — | — |
| 1977 | 81° | 72° | 76° | 0.38" | — |
| 1976 | 91° | 67° | 79° | — | — |
| 1975 | 95° | 72° | 83° | — | — |
| 1974 | 97° | 70° | 83° | — | — |
| 1973 | 97° | 69° | 83° | — | — |
| 1972 | 99° | 77° | 88° | — | — |
| 1971 | 92° | 73° | 82° | — | — |
55 years of data from DENTON 2 SE