Weather on April 20
San Marcos, CA
55 Years of Data
Avg High
75°F
Avg Low
50°F
Warmest
2009
79°F avg
Coldest
1982
48°F avg
About This Date
April 20th in San Marcos, CA typically brings pleasant spring weather, with average highs around 75°F and lows near 50°F — a 25°F daily swing. Over 55 years of records, the warmest April 20th was in 2009 (79°F average), while the coldest was 1982 (48°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 11% of April 20th dates historically, with the wettest April 20th recording 3.18" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for April 20th in San Marcos, CA? Great weather for outdoor activities.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 49° | 63° | — | — |
| 2024 | 78° | 56° | 67° | — | — |
| 2023 | 82° | 49° | 65° | — | — |
| 2022 | 74° | 56° | 65° | — | — |
| 2021 | 77° | 53° | 65° | — | — |
| 2020 | 69° | 56° | 62° | — | — |
| 2019 | 70° | 55° | 62° | — | — |
| 2018 | 77° | 47° | 62° | — | — |
| 2017 | 79° | 53° | 66° | — | — |
| 2016 | 89° | 53° | 71° | — | — |
| 2015 | 73° | 58° | 65° | — | — |
| 2014 | 78° | 54° | 66° | — | — |
| 2013 | 84° | 48° | 66° | — | — |
| 2012 | 82° | 53° | 68° | — | — |
| 2011 | 68° | 57° | 63° | — | — |
| 2010 | 65° | 54° | 59° | 0.05" | — |
| 2009warmest | 96° | 62° | 79° | — | — |
| 2008 | 61° | 50° | 55° | — | — |
| 2007 | 59° | 48° | 54° | 1.14" | — |
| 2006 | 71° | 54° | 62° | — | — |
| 2005 | 81° | 46° | 63° | — | — |
| 2004 | 73° | 48° | 61° | — | — |
| 2003 | 78° | 46° | 62° | — | — |
| 2002 | 71° | 46° | 59° | — | — |
| 2001 | 71° | 48° | 60° | — | — |
| 2000 | 80° | 48° | 64° | — | — |
| 1999 | 91° | 53° | 72° | — | — |
| 1998 | 83° | 51° | 67° | — | — |
| 1997 | 81° | 60° | 70° | — | — |
| 1996 | 71° | 45° | 58° | — | — |
| 1995 | 62° | 44° | 53° | — | — |
| 1994 | 78° | 55° | 67° | — | — |
| 1993 | 90° | 53° | 71° | — | — |
| 1992 | 88° | 52° | 70° | — | — |
| 1991 | 72° | 53° | 62° | — | — |
| 1990 | 64° | 57° | 61° | — | — |
| 1989 | 82° | 55° | 69° | — | — |
| 1988 | 69° | 51° | 60° | 3.18" | — |
| 1987 | 86° | 48° | 67° | — | — |
| 1986 | 89° | 51° | 70° | — | — |
| 1985 | 66° | 53° | 60° | — | — |
| 1984 | 69° | 45° | 57° | — | — |
| 1983 | 69° | 52° | 60° | 0.58" | — |
| 1982coldest | 47° | 49° | 48° | — | — |
| 1981 | 68° | 46° | 57° | — | — |
| 1980 | 82° | 54° | 68° | — | — |
| 1979 | 72° | 44° | 58° | — | — |
| 1978 | 71° | 52° | 61° | — | — |
| 1977 | 74° | 43° | 58° | — | — |
| 1976 | 83° | 47° | 65° | — | — |
| 1975 | 74° | 42° | 58° | — | — |
| 1974 | 68° | 43° | 55° | — | — |
| 1973 | 65° | 43° | 54° | 0.2" | — |
| 1972 | 70° | 37° | 53° | 0.08" | — |
| 1971 | 59° | 48° | 54° | — | — |
55 years of data from ESCONDIDO #2