Weather on August 23
San Marcos, CA
55 Years of Data
Avg High
87°F
Avg Low
63°F
Warmest
2025
89°F avg
Coldest
1987
65°F avg
About This Date
August 23rd in San Marcos, CA typically brings warm summer weather, with average highs around 87°F and lows near 63°F. Over 55 years of records, the warmest August 23rd was in 2025 (89°F average), while the coldest was 1987 (65°F) — a 24°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
Planning for August 23rd in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 110° | 68° | 89° | — | — |
| 2024 | 88° | 65° | 76° | — | — |
| 2023 | 88° | 65° | 76° | — | — |
| 2022 | 94° | 66° | 80° | — | — |
| 2021 | 85° | 66° | 75° | — | — |
| 2020 | 94° | 74° | 84° | — | — |
| 2019 | 85° | 64° | 74° | — | — |
| 2018 | 87° | 68° | 78° | — | — |
| 2017 | 78° | 67° | 72° | — | — |
| 2016 | 87° | 62° | 75° | — | — |
| 2015 | 87° | 67° | 77° | — | — |
| 2014 | 88° | 60° | 74° | — | — |
| 2013 | 93° | 64° | 79° | — | — |
| 2012 | 83° | 69° | 76° | — | — |
| 2011 | 88° | 63° | 75° | — | — |
| 2010 | 83° | 66° | 74° | — | — |
| 2009 | 74° | 67° | 70° | — | — |
| 2008 | 75° | 65° | 70° | — | — |
| 2007 | 86° | 65° | 75° | — | — |
| 2006 | 81° | 67° | 74° | — | — |
| 2005 | 71° | 63° | 67° | — | — |
| 2004 | 81° | 62° | 71° | — | — |
| 2003 | 85° | 63° | 74° | — | — |
| 2002 | 87° | 58° | 72° | — | — |
| 2001 | 84° | 59° | 72° | — | — |
| 2000 | 88° | 63° | 75° | — | — |
| 1999 | 91° | 61° | 76° | — | — |
| 1998 | 97° | 68° | 82° | — | — |
| 1997 | 97° | 68° | 82° | — | — |
| 1996 | 94° | 64° | 79° | — | — |
| 1995 | 88° | 64° | 76° | — | — |
| 1994 | 87° | 58° | 72° | — | — |
| 1993 | 85° | 59° | 72° | — | — |
| 1992 | 91° | 60° | 76° | — | — |
| 1991 | 93° | 64° | 79° | — | — |
| 1990 | 82° | 62° | 72° | — | — |
| 1989 | 80° | 58° | 69° | — | — |
| 1988 | 86° | 64° | 75° | — | — |
| 1987coldest | 76° | 55° | 65° | — | — |
| 1986 | 88° | 61° | 74° | — | — |
| 1985 | 95° | 58° | 76° | — | — |
| 1984 | 88° | 66° | 77° | — | — |
| 1983 | 82° | 67° | 74° | — | — |
| 1982 | 87° | 66° | 77° | — | — |
| 1981 | 93° | 63° | 78° | — | — |
| 1980 | 87° | 63° | 75° | — | — |
| 1979 | 94° | 58° | 76° | — | — |
| 1978 | 84° | 55° | 70° | — | — |
| 1977 | 83° | 63° | 73° | — | — |
| 1976 | 87° | 55° | 71° | — | — |
| 1975 | 92° | 53° | 72° | — | — |
| 1974 | 88° | 61° | 74° | — | — |
| 1973 | 87° | 55° | 71° | — | — |
| 1972 | 88° | 60° | 74° | — | — |
| 1971 | 84° | 57° | 71° | — | — |
55 years of data from ESCONDIDO #2