Weather on July 21
San Marcos, CA
55 Years of Data
Avg High
86°F
Avg Low
64°F
Warmest
1992
86°F avg
Coldest
2010
65°F avg
About This Date
July 21st in San Marcos, CA typically brings warm summer weather, with average highs around 86°F and lows near 64°F. Over 55 years of records, the warmest July 21st was in 1992 (86°F average), while the coldest was 2010 (65°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 4% of July 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 July 21st in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 65° | 74° | — | — |
| 2024 | 93° | 69° | 81° | — | — |
| 2023 | 91° | 68° | 80° | — | — |
| 2022 | 92° | 65° | 78° | — | — |
| 2021 | 94° | 68° | 81° | — | — |
| 2020 | 87° | 64° | 76° | — | — |
| 2019 | 89° | 64° | 77° | — | — |
| 2018 | 87° | 69° | 78° | — | — |
| 2017 | 89° | 67° | 78° | — | — |
| 2016 | 99° | 68° | 83° | — | — |
| 2015 | 83° | 69° | 76° | — | — |
| 2014 | 88° | 66° | 77° | — | — |
| 2013 | 76° | 64° | 70° | — | — |
| 2012 | 86° | 64° | 75° | — | — |
| 2011 | 87° | 61° | 74° | — | — |
| 2010coldest | 68° | 63° | 65° | — | — |
| 2009 | 81° | 68° | 74° | — | — |
| 2008 | 72° | 61° | 66° | — | — |
| 2007 | 83° | 62° | 72° | — | — |
| 2006 | 79° | 70° | 74° | — | — |
| 2005 | 97° | 71° | 84° | — | — |
| 2004 | 90° | 64° | 77° | — | — |
| 2003 | 76° | 65° | 70° | — | — |
| 2002 | 81° | 59° | 70° | — | — |
| 2001 | 83° | 58° | 70° | — | — |
| 2000 | 86° | 63° | 74° | — | — |
| 1999 | 83° | 57° | 70° | — | — |
| 1998 | 86° | 65° | 75° | — | — |
| 1997 | 80° | 59° | 70° | 0.15" | — |
| 1996 | 90° | 60° | 75° | — | — |
| 1995 | 87° | 56° | 71° | — | — |
| 1994 | 87° | 62° | 75° | — | — |
| 1993 | 80° | 63° | 71° | — | — |
| 1992warmest | 91° | 81° | 86° | — | — |
| 1991 | 76° | 62° | 69° | — | — |
| 1990 | 89° | 65° | 77° | — | — |
| 1989 | 88° | 61° | 74° | — | — |
| 1988 | 94° | 69° | 81° | — | — |
| 1987 | 74° | 59° | 66° | 0.18" | — |
| 1986 | 80° | 63° | 71° | — | — |
| 1985 | 90° | 64° | 77° | — | — |
| 1984 | 84° | 68° | 76° | — | — |
| 1983 | 94° | 61° | 77° | — | — |
| 1982 | 97° | 63° | 80° | — | — |
| 1981 | 93° | 69° | 81° | — | — |
| 1980 | 87° | 60° | 74° | — | — |
| 1979 | 83° | 63° | 73° | — | — |
| 1978 | 89° | 57° | 73° | — | — |
| 1977 | 91° | 56° | 73° | — | — |
| 1976 | 83° | 62° | 72° | — | — |
| 1975 | 85° | 59° | 72° | — | — |
| 1974 | 88° | 65° | 76° | — | — |
| 1973 | 80° | 55° | 68° | — | — |
| 1972 | 80° | 60° | 70° | — | — |
| 1971 | 90° | 60° | 75° | — | — |
55 years of data from ESCONDIDO #2