Weather on October 18
San Marcos, CA
55 Years of Data
Avg High
78°F
Avg Low
55°F
Warmest
2012
76°F avg
Coldest
1971
51°F avg
About This Date
October 18th in San Marcos, CA typically brings pleasant fall weather, with average highs around 78°F and lows near 55°F. Over 55 years of records, the warmest October 18th was in 2012 (76°F average), while the coldest was 1971 (51°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 9% of October 18th dates historically, with the wettest October 18th recording 2.82" of rain. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for October 18th in San Marcos, CA? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 53° | 72° | — | — |
| 2024 | 76° | 56° | 66° | — | — |
| 2023 | 90° | 57° | 73° | — | — |
| 2022 | 94° | 59° | 76° | — | — |
| 2021 | 65° | 53° | 59° | — | — |
| 2020 | 91° | 61° | 76° | — | — |
| 2019 | 78° | 57° | 68° | — | — |
| 2018 | 85° | 54° | 69° | — | — |
| 2017 | 87° | 62° | 75° | — | — |
| 2016 | 77° | 59° | 68° | — | — |
| 2015 | 79° | 69° | 74° | — | — |
| 2014 | 76° | 64° | 70° | — | — |
| 2013 | 83° | 50° | 66° | — | — |
| 2012warmest | 83° | 69° | 76° | — | — |
| 2011 | 80° | 57° | 69° | — | — |
| 2010 | 66° | 59° | 63° | 0.81" | — |
| 2009 | 70° | 58° | 64° | 0.03" | — |
| 2008 | 72° | 57° | 64° | — | — |
| 2007 | 70° | 54° | 62° | — | — |
| 2006 | 80° | 49° | 64° | — | — |
| 2005 | 67° | 56° | 61° | 0.61" | — |
| 2004 | 71° | 61° | 66° | 2.82" | — |
| 2003 | 79° | 58° | 68° | — | — |
| 2002 | 68° | 58° | 63° | — | — |
| 2001 | 84° | 49° | 66° | — | — |
| 2000 | 74° | 60° | 67° | — | — |
| 1999 | 87° | 49° | 68° | — | — |
| 1998 | 84° | 46° | 65° | — | — |
| 1997 | 89° | 53° | 71° | — | — |
| 1996 | 77° | 53° | 65° | — | — |
| 1995 | 74° | 55° | 64° | — | — |
| 1994 | 71° | 47° | 59° | — | — |
| 1993 | 73° | 52° | 62° | — | — |
| 1992 | 78° | 57° | 68° | — | — |
| 1991 | 90° | 56° | 73° | — | — |
| 1990 | 78° | 58° | 68° | — | — |
| 1989 | 96° | 52° | 74° | — | — |
| 1988 | 80° | 62° | 71° | — | — |
| 1987 | 71° | 61° | 66° | — | — |
| 1986 | 72° | 54° | 63° | — | — |
| 1985 | 74° | 62° | 68° | — | — |
| 1984 | 72° | 47° | 59° | — | — |
| 1983 | 74° | 55° | 64° | — | — |
| 1982 | 79° | 54° | 66° | — | — |
| 1981 | 88° | 48° | 68° | — | — |
| 1980 | 84° | 42° | 63° | — | — |
| 1979 | 75° | 59° | 67° | — | — |
| 1978 | 79° | 51° | 65° | — | — |
| 1977 | 76° | 59° | 67° | — | — |
| 1976 | 75° | 60° | 68° | — | — |
| 1975 | 71° | 55° | 63° | — | — |
| 1974 | 89° | 52° | 70° | — | — |
| 1973 | 94° | 54° | 74° | — | — |
| 1972 | 64° | 58° | 61° | 0.2" | — |
| 1971coldest | 65° | 38° | 51° | — | — |
55 years of data from ESCONDIDO #2