Weather on August 21
Mesa, AZ
55 Years of Data
Avg High
103°F
Avg Low
77°F
Warmest
1986
98°F avg
Coldest
1971
80°F avg
About This Date
August 21st in Mesa, AZ typically brings hot summer weather, with average highs around 103°F and lows near 77°F — a 26°F daily swing. Over 54 years of records, the warmest August 21st was in 1986 (98°F average), while the coldest was 1971 (80°F) — a 18°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 2.67" of rain. The last decade has been 3.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.6°F cooler on this date compared to 20-30 years ago.
Planning for August 21st in Mesa, AZ? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 114° | — | — | — | — |
| 2024 | 108° | 82° | 95° | — | — |
| 2022 | 98° | 71° | 85° | — | — |
| 2021 | 101° | 68° | 84° | — | — |
| 2020 | — | 77° | — | 0.58" | — |
| 2019 | 111° | 70° | 90° | — | — |
| 2018 | 105° | 78° | 92° | 0.05" | — |
| 2017 | 102° | 75° | 89° | — | — |
| 2016 | 99° | 71° | 85° | 0.53" | — |
| 2015 | 104° | 79° | 91° | — | — |
| 2014 | — | 69° | — | — | — |
| 2013 | — | 81° | — | — | — |
| 2012 | 100° | 82° | 91° | — | — |
| 2011 | 105° | 85° | 95° | — | — |
| 2010 | 105° | 75° | 90° | — | — |
| 2009 | 106° | 78° | 92° | — | — |
| 2008 | 105° | 74° | 89° | — | — |
| 2007 | 107° | 86° | 97° | — | — |
| 2006 | 109° | 78° | 94° | — | — |
| 2005 | 107° | 79° | 93° | — | — |
| 2004 | 101° | 77° | 89° | — | — |
| 2003 | 102° | 81° | 91° | — | — |
| 2002 | 102° | 75° | 89° | — | — |
| 2001 | 105° | 80° | 93° | — | — |
| 2000 | 103° | 82° | 92° | — | — |
| 1999 | 105° | 80° | 93° | — | — |
| 1998 | 106° | 81° | 93° | — | — |
| 1997 | 105° | 86° | 96° | — | — |
| 1996 | 105° | 81° | 93° | — | — |
| 1995 | 100° | 70° | 85° | 2.67" | — |
| 1994 | 107° | 82° | 95° | — | — |
| 1993 | 103° | 77° | 90° | — | — |
| 1992 | 100° | 80° | 90° | — | — |
| 1991 | 101° | 83° | 92° | — | — |
| 1990 | 98° | 71° | 85° | — | — |
| 1989 | 98° | 71° | 85° | — | — |
| 1988 | 94° | 76° | 85° | 0.74" | — |
| 1987 | 105° | 80° | 93° | — | — |
| 1986warmest | 111° | 84° | 98° | — | — |
| 1985 | 93° | 74° | 83° | — | — |
| 1984 | 95° | 75° | 85° | — | — |
| 1983 | 95° | 72° | 83° | — | — |
| 1982 | 111° | 80° | 96° | — | — |
| 1981 | 107° | 79° | 93° | — | — |
| 1980 | 99° | 68° | 83° | — | — |
| 1979 | 97° | 65° | 81° | — | — |
| 1978 | 103° | 77° | 90° | 1.32" | — |
| 1977 | 110° | 82° | 96° | — | — |
| 1976 | 107° | 76° | 91° | — | — |
| 1975 | 99° | 70° | 84° | — | — |
| 1974 | 102° | 70° | 86° | — | — |
| 1973 | 103° | 75° | 89° | — | — |
| 1972 | 100° | 70° | 85° | — | — |
| 1971coldest | 88° | 73° | 80° | — | — |
54 years of data from MESA