Weather on August 21
Mcallen, TX
55 Years of Data
Avg High
98°F
Avg Low
77°F
Warmest
2018
92°F avg
Coldest
1992
78°F avg
About This Date
August 21st in Mcallen, TX typically brings hot summer weather, with average highs around 98°F and lows near 77°F. Over 55 years of records, the warmest August 21st was in 2018 (92°F average), while the coldest was 1992 (78°F) — a 14°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 0.76" 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 August 21st in Mcallen, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 94° | 79° | 86° | — | — |
| 2024 | 105° | 79° | 92° | — | — |
| 2023 | 96° | 77° | 87° | — | — |
| 2022 | 94° | 79° | 86° | — | — |
| 2021 | 97° | 78° | 87° | — | — |
| 2020 | 99° | 76° | 87° | — | — |
| 2019 | 102° | 79° | 90° | — | — |
| 2018warmest | 103° | 81° | 92° | — | — |
| 2017 | 101° | 80° | 90° | — | — |
| 2016 | 99° | 81° | 90° | — | — |
| 2015 | 97° | 76° | 86° | — | — |
| 2014 | 99° | 80° | 89° | — | — |
| 2013 | 99° | 78° | 88° | — | — |
| 2012 | 99° | 77° | 88° | — | — |
| 2011 | 101° | 80° | 90° | — | — |
| 2010 | 100° | 80° | 90° | — | — |
| 2009 | 100° | 80° | 90° | — | — |
| 2008 | 92° | 78° | 85° | — | — |
| 2007 | 99° | 78° | 88° | 0.23" | — |
| 2006 | 101° | 77° | 89° | — | — |
| 2005 | 98° | 79° | 88° | — | — |
| 2004 | 99° | 79° | 89° | — | — |
| 2003 | 98° | 77° | 88° | — | — |
| 2002 | 99° | 79° | 89° | — | — |
| 2001 | 99° | 79° | 89° | — | — |
| 2000 | 99° | 76° | 87° | — | — |
| 1999 | 98° | 77° | 88° | — | — |
| 1998 | 97° | 77° | 87° | — | — |
| 1997 | 103° | 77° | 90° | — | — |
| 1996 | 85° | 76° | 80° | 0.13" | — |
| 1995 | 96° | 75° | 86° | — | — |
| 1994 | 102° | 77° | 90° | — | — |
| 1993 | 97° | 73° | 85° | — | — |
| 1992coldest | 85° | 71° | 78° | — | — |
| 1991 | 99° | 77° | 88° | — | — |
| 1990 | 98° | 77° | 88° | — | — |
| 1989 | 96° | 74° | 85° | — | — |
| 1988 | 93° | 77° | 85° | — | — |
| 1987 | 97° | 75° | 86° | 0.03" | — |
| 1986 | 102° | 78° | 90° | — | — |
| 1985 | 102° | 76° | 89° | — | — |
| 1984 | 98° | 76° | 87° | — | — |
| 1983 | 98° | 75° | 87° | — | — |
| 1982 | 90° | 73° | 81° | 0.15" | — |
| 1981 | 101° | 76° | 88° | — | — |
| 1980 | 96° | — | — | — | — |
| 1979 | 97° | 75° | 86° | — | — |
| 1978 | 99° | 71° | 85° | 0.76" | — |
| 1977 | 99° | 76° | 87° | — | — |
| 1976 | 95° | 70° | 82° | — | — |
| 1975 | 92° | 74° | 83° | 0.33" | — |
| 1974 | 99° | 72° | 85° | — | — |
| 1973 | 95° | 73° | 84° | — | — |
| 1972 | 94° | 71° | 82° | — | — |
| 1971 | 97° | 73° | 85° | — | — |
55 years of data from MCALLEN