Weather on August 18
Mcallen, TX
55 Years of Data
Avg High
98°F
Avg Low
77°F
Warmest
2019
93°F avg
Coldest
1988
77°F avg
About This Date
August 18th 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 18th was in 2019 (93°F average), while the coldest was 1988 (77°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 9% of August 18th dates historically, with the wettest August 18th recording 1.65" 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 18th in Mcallen, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 100° | 79° | 89° | — | — |
| 2024 | 101° | 81° | 91° | — | — |
| 2023 | 101° | — | — | — | — |
| 2022 | 96° | 79° | 87° | — | — |
| 2021 | 97° | 78° | 87° | — | — |
| 2020 | 99° | 76° | 87° | — | — |
| 2019warmest | 104° | 82° | 93° | — | — |
| 2018 | 103° | 78° | 90° | — | — |
| 2017 | 99° | 80° | 89° | — | — |
| 2016 | 95° | 75° | 85° | 0.81" | — |
| 2015 | 102° | 77° | 90° | — | — |
| 2014 | 101° | 81° | 91° | — | — |
| 2013 | 98° | 80° | 89° | — | — |
| 2012 | 101° | 80° | 90° | — | — |
| 2011 | 102° | 79° | 90° | — | — |
| 2010 | 101° | 80° | 90° | — | — |
| 2009 | 101° | 81° | 91° | — | — |
| 2008 | 96° | 80° | 88° | — | — |
| 2007 | 95° | 80° | 88° | — | — |
| 2006 | 97° | 79° | 88° | 0.05" | — |
| 2005 | 98° | 78° | 88° | 1.65" | — |
| 2004 | 98° | 73° | 86° | — | — |
| 2003 | 95° | 76° | 85° | — | — |
| 2002 | 97° | 79° | 88° | — | — |
| 2001 | 100° | 79° | 89° | — | — |
| 2000 | 100° | 76° | 88° | — | — |
| 1999 | 97° | 75° | 86° | — | — |
| 1998 | 98° | 82° | 90° | — | — |
| 1997 | 100° | 79° | 89° | — | — |
| 1996 | 100° | 76° | 88° | — | — |
| 1995 | 95° | 76° | 85° | — | — |
| 1994 | 102° | 78° | 90° | — | — |
| 1993 | 98° | 76° | 87° | — | — |
| 1992 | 89° | 70° | 79° | — | — |
| 1991 | 99° | 77° | 88° | — | — |
| 1990 | 97° | 76° | 86° | — | — |
| 1989 | 92° | 75° | 83° | — | — |
| 1988coldest | 81° | 73° | 77° | 1.52" | — |
| 1987 | 99° | 78° | 88° | — | — |
| 1986 | 100° | 78° | 89° | — | — |
| 1985 | 100° | 78° | 89° | — | — |
| 1984 | 97° | 74° | 85° | — | — |
| 1983 | 95° | 75° | 85° | — | — |
| 1982 | 98° | 74° | 86° | — | — |
| 1981 | 103° | 75° | 89° | — | — |
| 1980 | 94° | 75° | 84° | — | — |
| 1979 | 98° | 71° | 85° | — | — |
| 1978 | 98° | 75° | 87° | — | — |
| 1977 | 98° | 73° | 86° | — | — |
| 1976 | 95° | 73° | 84° | — | — |
| 1975 | 95° | 73° | 84° | — | — |
| 1974 | 99° | 72° | 85° | — | — |
| 1973 | 93° | 74° | 83° | 0.05" | — |
| 1972 | 97° | 73° | 85° | — | — |
| 1971 | 96° | 72° | 84° | — | — |
55 years of data from MCALLEN