Weather on August 18
Murrieta, CA
55 Years of Data
Avg High
89°F
Avg Low
62°F
Warmest
1992
89°F avg
Coldest
2021
66°F avg
About This Date
August 18th in Murrieta, CA typically brings warm summer weather, with average highs around 89°F and lows near 62°F — a 27°F daily swing. Over 55 years of records, the warmest August 18th was in 1992 (89°F average), while the coldest was 2021 (66°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 18th dates historically, with the wettest August 18th recording 1.91" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Murrieta, CA? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 62° | 75° | — | — |
| 2024 | 86° | 61° | 73° | — | — |
| 2023 | 90° | 68° | 79° | — | — |
| 2022 | 88° | 66° | 77° | — | — |
| 2021coldest | 70° | 62° | 66° | — | — |
| 2020 | 104° | 74° | 89° | — | — |
| 2019 | 83° | 55° | 69° | — | — |
| 2018 | 86° | 64° | 75° | — | — |
| 2017 | 81° | 59° | 70° | — | — |
| 2016 | 94° | 61° | 77° | — | — |
| 2015 | 83° | 63° | 73° | — | — |
| 2014 | 87° | 61° | 74° | — | — |
| 2013 | 85° | 66° | 75° | — | — |
| 2012 | 92° | 70° | 81° | — | — |
| 2011 | 88° | 62° | 75° | — | — |
| 2010 | 95° | 72° | 83° | — | — |
| 2009 | 80° | 57° | 69° | — | — |
| 2008 | 82° | 61° | 71° | — | — |
| 2007 | 94° | 67° | 80° | — | — |
| 2006 | 88° | 59° | 73° | — | — |
| 2005 | 81° | 54° | 67° | — | — |
| 2004 | 83° | 62° | 72° | — | — |
| 2003 | 89° | 60° | 75° | — | — |
| 2002 | 76° | 58° | 67° | — | — |
| 2001 | 94° | 73° | 83° | — | — |
| 2000 | 88° | 68° | 78° | — | — |
| 1999 | 87° | 67° | 77° | — | — |
| 1998 | 85° | 59° | 72° | — | — |
| 1997 | 87° | 59° | 73° | — | — |
| 1996 | 80° | 57° | 69° | — | — |
| 1995 | 86° | 60° | 73° | — | — |
| 1994 | 89° | 64° | 77° | — | — |
| 1993 | 83° | 59° | 71° | — | — |
| 1992warmest | 107° | 71° | 89° | — | — |
| 1991 | 96° | 61° | 78° | — | — |
| 1990 | 90° | 62° | 76° | — | — |
| 1989 | 87° | 59° | 73° | — | — |
| 1988 | 95° | 59° | 77° | — | — |
| 1987 | 90° | 57° | 73° | — | — |
| 1986 | 102° | 68° | 85° | — | — |
| 1985 | 91° | 61° | 76° | — | — |
| 1984 | 87° | 67° | 77° | — | — |
| 1983 | 78° | 68° | 73° | — | — |
| 1982 | 103° | 63° | 83° | — | — |
| 1981 | — | 67° | — | — | — |
| 1980 | 89° | 60° | 75° | — | — |
| 1979 | 89° | 59° | 74° | — | — |
| 1978 | 95° | 51° | 73° | — | — |
| 1977 | 87° | 66° | 77° | 1.91" | — |
| 1976 | 82° | 52° | 67° | — | — |
| 1975 | 88° | 50° | 69° | — | — |
| 1974 | 100° | 53° | 77° | — | — |
| 1973 | 107° | 65° | 86° | — | — |
| 1972 | 87° | 62° | 75° | — | — |
| 1971 | 100° | 70° | 85° | — | — |
55 years of data from SANTA ROSA PLATEAU CALIFORNIA