Weather on October 21
San Marcos, CA
55 Years of Data
Avg High
78°F
Avg Low
56°F
Warmest
2016
76°F avg
Coldest
1984
59°F avg
About This Date
October 21st in San Marcos, CA typically brings pleasant fall weather, with average highs around 78°F and lows near 56°F. Over 55 years of records, the warmest October 21st was in 2016 (76°F average), while the coldest was 1984 (59°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 9% of October 21st dates historically. The last decade has been 5.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.1°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in San Marcos, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 55° | 70° | — | — |
| 2024 | 86° | 54° | 70° | — | — |
| 2023 | 89° | 61° | 75° | — | — |
| 2022 | 83° | 60° | 71° | — | — |
| 2021 | 78° | 50° | 64° | — | — |
| 2020 | 80° | 61° | 70° | — | — |
| 2019 | 96° | 56° | 76° | — | — |
| 2018 | 83° | 55° | 69° | — | — |
| 2017 | 78° | 53° | 66° | — | — |
| 2016warmest | 95° | 57° | 76° | — | — |
| 2015 | 83° | 59° | 71° | — | — |
| 2014 | 81° | 63° | 72° | — | — |
| 2013 | 80° | 49° | 64° | — | — |
| 2012 | 69° | 61° | 65° | 0.41" | — |
| 2011 | 73° | 60° | 67° | — | — |
| 2010 | 65° | 59° | 62° | 0.2" | — |
| 2009 | 73° | 55° | 64° | — | — |
| 2008 | 70° | 54° | 62° | — | — |
| 2007 | 82° | 53° | 68° | — | — |
| 2006 | 88° | 50° | 69° | — | — |
| 2005 | 68° | 61° | 64° | — | — |
| 2004 | 68° | 56° | 62° | — | — |
| 2003 | 87° | 63° | 75° | — | — |
| 2002 | 70° | 55° | 62° | — | — |
| 2001 | 75° | 55° | 65° | — | — |
| 2000 | 68° | 58° | 63° | 0.08" | — |
| 1999 | 94° | 54° | 74° | — | — |
| 1998 | 77° | 52° | 64° | — | — |
| 1997 | 74° | 59° | 66° | — | — |
| 1996 | 76° | 46° | 61° | — | — |
| 1995 | 77° | 69° | 73° | — | — |
| 1994 | 78° | 49° | 63° | — | — |
| 1993 | 89° | 50° | 70° | — | — |
| 1992 | 74° | 62° | 68° | — | — |
| 1991 | 75° | 62° | 69° | — | — |
| 1990 | 87° | 53° | 70° | — | — |
| 1989 | 73° | 58° | 65° | 0.08" | — |
| 1988 | 79° | 59° | 69° | — | — |
| 1987 | 81° | 56° | 68° | — | — |
| 1986 | 82° | 50° | 66° | — | — |
| 1985 | 71° | 58° | 64° | — | — |
| 1984coldest | 70° | 48° | 59° | — | — |
| 1983 | 83° | 57° | 70° | — | — |
| 1982 | 81° | 50° | 65° | — | — |
| 1981 | 80° | 51° | 66° | — | — |
| 1980 | 90° | 49° | 69° | — | — |
| 1979 | 74° | — | — | — | — |
| 1978 | 79° | 59° | 69° | — | — |
| 1977 | 70° | 60° | 65° | — | — |
| 1976 | 72° | 65° | 68° | — | — |
| 1975 | 70° | 52° | 61° | — | — |
| 1974 | 73° | 58° | 65° | — | — |
| 1973 | 74° | 50° | 62° | — | — |
| 1972 | 71° | 48° | 60° | 0.03" | — |
| 1971 | 81° | 43° | 62° | — | — |
55 years of data from ESCONDIDO #2