Weather on August 21
Tempe, AZ
55 Years of Data
Avg High
103°F
Avg Low
76°F
Warmest
2007
97°F avg
Coldest
1980
81°F avg
About This Date
August 21st in Tempe, AZ typically brings hot summer weather, with average highs around 103°F and lows near 76°F — a 27°F daily swing. Over 55 years of records, the warmest August 21st was in 2007 (97°F average), while the coldest was 1980 (81°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 13% of August 21st dates historically, with the wettest August 21st recording 2.67" of rain. The last decade has been 4.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.1°F cooler on this date compared to 20-30 years ago.
Planning for August 21st in Tempe, AZ? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 114° | — | — | — | — |
| 2024 | 108° | 82° | 95° | — | — |
| 2023 | 91° | 78° | 85° | 0.1" | — |
| 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° | — | — |
| 2007warmest | 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 | 104° | 81° | 92° | — | — |
| 1986 | 108° | 84° | 96° | — | — |
| 1985 | 101° | 78° | 89° | — | — |
| 1984 | 100° | 75° | 88° | — | — |
| 1983 | 95° | 75° | 85° | — | — |
| 1982 | 107° | 80° | 94° | 0.18" | — |
| 1981 | 109° | 76° | 92° | — | — |
| 1980coldest | 102° | 59° | 81° | — | — |
| 1979 | 100° | — | — | — | — |
| 1978 | 102° | 67° | 84° | — | — |
| 1977 | 101° | 76° | 88° | — | — |
| 1976 | 107° | 68° | 88° | — | — |
| 1975 | 101° | 68° | 84° | — | — |
| 1974 | 105° | 64° | 85° | — | — |
| 1973 | 106° | 73° | 89° | — | — |
| 1972 | 105° | 67° | 86° | — | — |
| 1971 | 93° | 73° | 83° | — | — |
55 years of data from TEMPE ASU