Weather on August 21
Surprise, AZ
55 Years of Data
Avg High
104°F
Avg Low
79°F
Warmest
2025
100°F avg
Coldest
2023
80°F avg
About This Date
August 21st in Surprise, AZ typically brings hot summer weather, with average highs around 104°F and lows near 79°F — a 25°F daily swing. Over 55 years of records, the warmest August 21st was in 2025 (100°F average), while the coldest was 2023 (80°F) — a 20°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 4.83" of rain. The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.
Planning for August 21st in Surprise, AZ? 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 |
|---|---|---|---|---|---|
| 2025warmest | 113° | 87° | 100° | — | — |
| 2024 | 112° | 85° | 98° | — | — |
| 2023coldest | 89° | 72° | 80° | — | — |
| 2022 | 95° | 73° | 84° | 1.5" | — |
| 2021 | 100° | 77° | 89° | — | — |
| 2020 | 100° | 81° | 90° | — | — |
| 2019 | 112° | 78° | 95° | — | — |
| 2018 | 102° | 87° | 95° | — | — |
| 2017 | 102° | 83° | 92° | — | — |
| 2016 | 99° | 76° | 87° | 0.25" | — |
| 2015 | 105° | 83° | 94° | — | — |
| 2014 | 98° | 74° | 86° | 0.05" | — |
| 2013 | 110° | 86° | 98° | — | — |
| 2012 | 104° | 83° | 93° | — | — |
| 2011 | 107° | 79° | 93° | — | — |
| 2010 | 107° | 86° | 97° | — | — |
| 2009 | 109° | 85° | 97° | — | — |
| 2008 | 106° | 78° | 92° | — | — |
| 2007 | 104° | 86° | 95° | — | — |
| 2006 | 108° | 85° | 96° | — | — |
| 2005 | 109° | 80° | 95° | — | — |
| 2004 | 101° | 76° | 88° | — | — |
| 2003 | 102° | 79° | 90° | — | — |
| 2002 | 102° | 76° | 89° | — | — |
| 2001 | 104° | 80° | 92° | — | — |
| 2000 | 107° | 81° | 94° | — | — |
| 1999 | 108° | 82° | 95° | — | — |
| 1998 | 109° | 88° | 98° | — | — |
| 1997 | 110° | 89° | 99° | — | — |
| 1996 | 109° | 82° | 96° | — | — |
| 1995 | 101° | 73° | 87° | 0.71" | — |
| 1994 | 107° | 83° | 95° | — | — |
| 1993 | 105° | 81° | 93° | — | — |
| 1992 | 105° | 82° | 94° | — | — |
| 1991 | 107° | 83° | 95° | — | — |
| 1990 | 100° | 69° | 85° | — | — |
| 1989 | 100° | 71° | 86° | — | — |
| 1988 | 94° | 73° | 83° | 4.83" | — |
| 1987 | 103° | 78° | 90° | — | — |
| 1986 | 108° | 83° | 95° | — | — |
| 1985 | 99° | 76° | 87° | — | — |
| 1984 | 98° | 73° | 86° | — | — |
| 1983 | 96° | 74° | 85° | — | — |
| 1982 | 106° | 83° | 94° | — | — |
| 1981 | 111° | 84° | 98° | — | — |
| 1980 | 104° | 65° | 84° | — | — |
| 1979 | 100° | 62° | 81° | — | — |
| 1978 | 104° | 75° | 90° | — | — |
| 1977 | 103° | 82° | 92° | — | — |
| 1976 | 104° | 74° | 89° | — | — |
| 1975 | 102° | 71° | 87° | — | — |
| 1974 | 104° | 69° | 87° | — | — |
| 1973 | 107° | 75° | 91° | — | — |
| 1972 | 106° | 70° | 88° | — | — |
| 1971 | 93° | 72° | 82° | 1.68" | — |
55 years of data from YOUNGTOWN