Weather on October 20
San Marcos, CA
55 Years of Data
About This Date
October 20th 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 20th was in 2023 (79°F average), while the coldest was 1984 (56°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 9% of October 20th dates historically, with the wettest October 20th recording 3.48" of rain. The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in San Marcos, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 53° | 70° | — | — |
| 2024 | 87° | 53° | 70° | — | — |
| 2023warmest | 95° | 63° | 79° | — | — |
| 2022 | 95° | 61° | 78° | — | — |
| 2021 | 74° | 48° | 61° | — | — |
| 2020 | 84° | 62° | 73° | — | — |
| 2019 | 83° | 53° | 68° | — | — |
| 2018 | 88° | 54° | 71° | — | — |
| 2017 | 72° | 63° | 67° | — | — |
| 2016 | 96° | 56° | 76° | — | — |
| 2015 | 78° | 60° | 69° | — | — |
| 2014 | 78° | 62° | 70° | — | — |
| 2013 | 83° | 50° | 66° | — | — |
| 2012 | 71° | 63° | 67° | — | — |
| 2011 | 75° | 57° | 66° | — | — |
| 2010 | 68° | 56° | 62° | 2.11" | — |
| 2009 | 69° | 60° | 65° | — | — |
| 2008 | 67° | 56° | 61° | — | — |
| 2007 | 69° | 56° | 62° | — | — |
| 2006 | 87° | 49° | 68° | — | — |
| 2005 | 67° | 59° | 63° | — | — |
| 2004 | 66° | 58° | 62° | 3.48" | — |
| 2003 | 82° | 61° | 71° | — | — |
| 2002 | 72° | 56° | 64° | — | — |
| 2001 | 75° | 56° | 65° | — | — |
| 2000 | 80° | 58° | 69° | — | — |
| 1999 | 96° | 54° | 75° | — | — |
| 1998 | 64° | 49° | 56° | — | — |
| 1997 | 74° | 60° | 67° | — | — |
| 1996 | 73° | 50° | 62° | — | — |
| 1995 | 80° | 54° | 67° | — | — |
| 1994 | 76° | 48° | 62° | — | — |
| 1993 | 88° | 49° | 68° | — | — |
| 1992 | 79° | 54° | 66° | — | — |
| 1991 | — | 55° | — | — | — |
| 1990 | 81° | 57° | 69° | — | — |
| 1989 | 76° | 61° | 68° | — | — |
| 1988 | 74° | 63° | 68° | — | — |
| 1987 | 74° | 57° | 65° | — | — |
| 1986 | 75° | 48° | 62° | — | — |
| 1985 | 75° | 51° | 63° | — | — |
| 1984coldest | 70° | 43° | 56° | — | — |
| 1983 | 77° | 58° | 67° | — | — |
| 1982 | 79° | 52° | 65° | — | — |
| 1981 | 86° | 50° | 68° | — | — |
| 1980 | 90° | 48° | 69° | — | — |
| 1979 | 77° | 57° | 67° | 3.2" | — |
| 1978 | 78° | 60° | 69° | — | — |
| 1977 | 67° | 52° | 59° | — | — |
| 1976 | 80° | 62° | 71° | — | — |
| 1975 | 72° | 49° | 60° | 0.08" | — |
| 1974 | 74° | 57° | 65° | — | — |
| 1973 | 80° | 50° | 65° | — | — |
| 1972 | 70° | 50° | 60° | 0.97" | — |
| 1971 | 75° | 40° | 57° | — | — |
San Marcos, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Marcos, CA Monthly Precipitation
Average rainfall per month, in inches.
San Marcos, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit San Marcos, CA
Most pleasant months in San Marcos, CA: June.