Weather on July 18
San Marcos, CA
55 Years of Data
Avg High
86°F
Avg Low
63°F
Warmest
1998
84°F avg
Coldest
2002
67°F avg
About This Date
July 18th in San Marcos, CA typically brings warm summer weather, with average highs around 86°F and lows near 63°F. Over 55 years of records, the warmest July 18th was in 1998 (84°F average), while the coldest was 2002 (67°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 5% of July 18th dates historically, with the wettest July 18th recording 1.52" 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 July 18th in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 66° | 75° | — | — |
| 2024 | 92° | 65° | 78° | — | — |
| 2023 | 95° | 68° | 82° | — | — |
| 2022 | 91° | 67° | 79° | — | — |
| 2021 | 91° | 69° | 80° | 0.08" | — |
| 2020 | 89° | 64° | 77° | — | — |
| 2019 | 87° | 64° | 76° | — | — |
| 2018 | 89° | 68° | 79° | — | — |
| 2017 | 88° | 67° | 77° | — | — |
| 2016 | 86° | 65° | 75° | — | — |
| 2015 | 77° | 64° | 71° | 1.52" | — |
| 2014 | 83° | 63° | 73° | — | — |
| 2013 | 89° | 61° | 75° | — | — |
| 2012 | 88° | 59° | 73° | — | — |
| 2011 | 84° | 59° | 72° | — | — |
| 2010 | 74° | 65° | 69° | — | — |
| 2009 | 79° | 65° | 72° | — | — |
| 2008 | 72° | 65° | 68° | — | — |
| 2007 | 73° | 63° | 68° | — | — |
| 2006 | 91° | 69° | 80° | — | — |
| 2005 | 87° | 63° | 75° | — | — |
| 2004 | 96° | 64° | 80° | — | — |
| 2003 | 81° | 69° | 75° | — | — |
| 2002coldest | 70° | 65° | 67° | — | — |
| 2001 | 83° | 59° | 71° | — | — |
| 2000 | 91° | 60° | 76° | — | — |
| 1999 | 84° | 64° | 74° | — | — |
| 1998warmest | 98° | 70° | 84° | — | — |
| 1997 | 86° | 64° | 75° | — | — |
| 1996 | 84° | 61° | 72° | — | — |
| 1995 | 93° | 62° | 78° | — | — |
| 1994 | 85° | 65° | 75° | — | — |
| 1993 | 83° | 61° | 72° | — | — |
| 1992 | 100° | 66° | 83° | — | — |
| 1991 | 76° | 60° | 68° | — | — |
| 1990 | 87° | 67° | 77° | — | — |
| 1989 | 85° | 59° | 72° | — | — |
| 1988 | 83° | 62° | 72° | — | — |
| 1987 | 78° | 58° | 68° | — | — |
| 1986 | 84° | 57° | 71° | — | — |
| 1985 | 91° | 65° | 78° | 0.2" | — |
| 1984 | 93° | 69° | 81° | — | — |
| 1983 | 85° | 55° | 70° | — | — |
| 1982 | 82° | 60° | 71° | — | — |
| 1981 | 90° | 59° | 74° | — | — |
| 1980 | 89° | 59° | 74° | — | — |
| 1979 | 96° | 60° | 78° | — | — |
| 1978 | 89° | 59° | 74° | — | — |
| 1977 | 90° | 60° | 75° | — | — |
| 1976 | 82° | 62° | 72° | — | — |
| 1975 | 82° | 62° | 72° | — | — |
| 1974 | 91° | 58° | 74° | — | — |
| 1973 | 84° | 59° | 72° | — | — |
| 1972 | 84° | 65° | 74° | — | — |
| 1971 | 94° | 60° | 77° | — | — |
55 years of data from ESCONDIDO #2