Weather on August 18
Surprise, AZ
55 Years of Data
Avg High
104°F
Avg Low
78°F
Warmest
1999
99°F avg
Coldest
1979
80°F avg
About This Date
August 18th in Surprise, AZ typically brings hot summer weather, with average highs around 104°F and lows near 78°F — a 26°F daily swing. Over 55 years of records, the warmest August 18th was in 1999 (99°F average), while the coldest was 1979 (80°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 11% of August 18th dates historically, with the wettest August 18th recording 1.09" 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 Surprise, AZ? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 105° | 79° | 92° | — | — |
| 2024 | 111° | 88° | 99° | — | — |
| 2023 | 105° | 81° | 93° | — | — |
| 2022 | 102° | 77° | 90° | 1.09" | — |
| 2021 | 96° | 73° | 85° | — | — |
| 2020 | 112° | 87° | 99° | — | — |
| 2019 | 104° | 79° | 91° | — | — |
| 2018 | 106° | 83° | 94° | — | — |
| 2017 | 106° | 74° | 90° | — | — |
| 2016 | 103° | 81° | 92° | — | — |
| 2015 | 106° | 82° | 94° | — | — |
| 2014 | 109° | 77° | 93° | 0.38" | — |
| 2013 | 111° | 82° | 97° | 0.08" | — |
| 2012 | 99° | 79° | 89° | — | — |
| 2011 | 110° | 86° | 98° | — | — |
| 2010 | 106° | 75° | 90° | 0.3" | — |
| 2009 | 107° | 74° | 90° | — | — |
| 2008 | 104° | 82° | 93° | — | — |
| 2007 | 108° | 86° | 97° | — | — |
| 2006 | 104° | 81° | 92° | — | — |
| 2005 | 102° | 79° | 90° | — | — |
| 2004 | 104° | 76° | 90° | — | — |
| 2003 | 108° | 81° | 94° | — | — |
| 2002 | 107° | 84° | 96° | — | — |
| 2001 | 105° | 82° | 94° | — | — |
| 2000 | 103° | 79° | 91° | — | — |
| 1999warmest | 111° | 86° | 99° | — | — |
| 1998 | 103° | 75° | 89° | — | — |
| 1997 | 102° | 76° | 89° | — | — |
| 1996 | 103° | 80° | 91° | — | — |
| 1995 | 106° | 80° | 93° | — | — |
| 1994 | 108° | 82° | 95° | — | — |
| 1993 | 107° | 77° | 92° | — | — |
| 1992 | 111° | 83° | 97° | — | — |
| 1991 | 106° | 78° | 92° | — | — |
| 1990 | 101° | 76° | 88° | — | — |
| 1989 | 102° | 75° | 89° | 0.64" | — |
| 1988 | 106° | 82° | 94° | — | — |
| 1987 | 108° | 73° | 90° | — | — |
| 1986 | 101° | 80° | 90° | — | — |
| 1985 | 102° | 75° | 89° | — | — |
| 1984 | 93° | 73° | 83° | — | — |
| 1983 | 92° | 72° | 82° | — | — |
| 1982 | 104° | 78° | 91° | 0.03" | — |
| 1981 | 105° | 79° | 92° | — | — |
| 1980 | 100° | 68° | 84° | — | — |
| 1979coldest | 96° | 64° | 80° | — | — |
| 1978 | 102° | 77° | 90° | — | — |
| 1977 | 102° | 75° | 89° | — | — |
| 1976 | 101° | 69° | 85° | — | — |
| 1975 | 102° | 62° | 82° | — | — |
| 1974 | 105° | 72° | 88° | — | — |
| 1973 | 106° | 75° | 90° | — | — |
| 1972 | 99° | 72° | 85° | — | — |
| 1971 | 99° | 74° | 86° | — | — |
55 years of data from YOUNGTOWN