Weather on August 17
San Marcos, CA
55 Years of Data
Avg High
86°F
Avg Low
64°F
Warmest
1992
88°F avg
Coldest
1972
68°F avg
About This Date
August 17th in San Marcos, CA typically brings warm summer weather, with average highs around 86°F and lows near 64°F. Over 55 years of records, the warmest August 17th was in 1992 (88°F average), while the coldest was 1972 (68°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 17th dates historically, with the wettest August 17th recording 4.57" of rain. 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 17th in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 63° | 74° | — | — |
| 2024 | 89° | 65° | 77° | — | — |
| 2023 | 97° | 67° | 82° | — | — |
| 2022 | 94° | 67° | 80° | — | — |
| 2021 | 89° | 68° | 79° | — | — |
| 2020 | 97° | 73° | 85° | — | — |
| 2019 | 86° | 64° | 75° | — | — |
| 2018 | 91° | 69° | 80° | — | — |
| 2017 | 84° | 60° | 72° | — | — |
| 2016 | 101° | 64° | 82° | — | — |
| 2015 | 89° | 70° | 79° | — | — |
| 2014 | 94° | 67° | 80° | — | — |
| 2013 | 92° | 65° | 78° | — | — |
| 2012 | 95° | 75° | 85° | — | — |
| 2011 | 88° | 57° | 72° | — | — |
| 2010 | 80° | 65° | 72° | — | — |
| 2009 | 72° | 64° | 68° | — | — |
| 2008 | 75° | 67° | 71° | — | — |
| 2007 | 78° | 70° | 74° | — | — |
| 2006 | 73° | 64° | 69° | — | — |
| 2005 | 74° | 65° | 69° | — | — |
| 2004 | 85° | 61° | 73° | — | — |
| 2003 | 95° | 67° | 81° | — | — |
| 2002 | 80° | 63° | 71° | — | — |
| 2001 | 96° | 64° | 80° | — | — |
| 2000 | 89° | 68° | 79° | — | — |
| 1999 | 89° | 62° | 76° | — | — |
| 1998 | 84° | 66° | 75° | — | — |
| 1997 | 86° | 64° | 75° | — | — |
| 1996 | 89° | 66° | 78° | — | — |
| 1995 | 85° | 60° | 72° | — | — |
| 1994 | 94° | 69° | 81° | — | — |
| 1993 | 83° | 60° | 71° | — | — |
| 1992warmest | 104° | 71° | 88° | — | — |
| 1991 | 84° | 64° | 74° | — | — |
| 1990 | 83° | 62° | 72° | — | — |
| 1989 | 82° | 62° | 72° | — | — |
| 1988 | 82° | 60° | 71° | — | — |
| 1987 | 78° | 62° | 70° | — | — |
| 1986 | 90° | 59° | 74° | — | — |
| 1985 | 78° | 62° | 70° | — | — |
| 1984 | 90° | 68° | 79° | 0.05" | — |
| 1983 | 85° | 72° | 78° | — | — |
| 1982 | 86° | 59° | 73° | — | — |
| 1981 | 90° | 64° | 77° | — | — |
| 1980 | 82° | 63° | 72° | — | — |
| 1979 | 85° | 62° | 73° | — | — |
| 1978 | 85° | 58° | 71° | — | — |
| 1977 | 78° | 69° | 74° | 4.57" | — |
| 1976 | 78° | 58° | 68° | — | — |
| 1975 | 80° | 58° | 69° | — | — |
| 1974 | 88° | 58° | 73° | — | — |
| 1973 | 88° | 62° | 75° | — | — |
| 1972coldest | 83° | 54° | 68° | — | — |
| 1971 | 89° | 63° | 76° | — | — |
55 years of data from ESCONDIDO #2