Weather on June 21
San Marcos, CA
55 Years of Data
Avg High
83°F
Avg Low
59°F
Warmest
1973
80°F avg
Coldest
2003
54°F avg
About This Date
June 21st in San Marcos, CA typically brings warm summer weather, with average highs around 83°F and lows near 59°F. Over 55 years of records, the warmest June 21st was in 1973 (80°F average), while the coldest was 2003 (54°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 7% of June 21st dates historically. The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.
Planning for June 21st in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 61° | 70° | — | — |
| 2024 | 88° | 62° | 75° | — | — |
| 2023 | 85° | 55° | 70° | — | — |
| 2022 | 94° | 62° | 78° | — | — |
| 2021 | 87° | 61° | 74° | — | — |
| 2020 | 81° | 62° | 71° | — | — |
| 2019 | 75° | 61° | 68° | 0.03" | — |
| 2018 | 88° | 64° | 76° | — | — |
| 2017 | 94° | 63° | 78° | — | — |
| 2016 | 82° | 70° | 76° | — | — |
| 2015 | 85° | 62° | 73° | — | — |
| 2014 | 91° | 60° | 76° | — | — |
| 2013 | 81° | 57° | 69° | — | — |
| 2012 | 79° | 59° | 69° | — | — |
| 2011 | 90° | 59° | 74° | — | — |
| 2010 | 66° | 59° | 63° | — | — |
| 2009 | 69° | 62° | 66° | — | — |
| 2008 | 92° | 68° | 80° | — | — |
| 2007 | 87° | 55° | 71° | — | — |
| 2006 | 89° | 60° | 75° | — | — |
| 2005 | 85° | 58° | 71° | — | — |
| 2004 | 77° | 58° | 67° | — | — |
| 2003coldest | 66° | 41° | 54° | 0.03" | — |
| 2002 | 77° | 60° | 69° | — | — |
| 2001 | 90° | 63° | 76° | — | — |
| 2000 | 85° | 62° | 73° | — | — |
| 1999 | 79° | 55° | 67° | — | — |
| 1998 | 83° | 62° | 72° | — | — |
| 1997 | 80° | 60° | 70° | — | — |
| 1996 | 83° | 60° | 71° | — | — |
| 1995 | 77° | 55° | 66° | — | — |
| 1994 | 85° | 59° | 72° | — | — |
| 1993 | 85° | 64° | 74° | — | — |
| 1992 | 86° | 58° | 72° | — | — |
| 1991 | 74° | 55° | 64° | — | — |
| 1990 | 83° | 58° | 70° | — | — |
| 1989 | 93° | 60° | 77° | — | — |
| 1988 | 78° | 53° | 66° | — | — |
| 1987 | 77° | 56° | 66° | — | — |
| 1986 | 81° | 51° | 66° | — | — |
| 1985 | 80° | 59° | 70° | — | — |
| 1984 | 87° | 58° | 72° | — | — |
| 1983 | 79° | 61° | 70° | — | — |
| 1982 | 65° | 58° | 61° | 0.08" | — |
| 1981 | 92° | 59° | 75° | — | — |
| 1980 | 86° | 54° | 70° | — | — |
| 1979 | 81° | 56° | 68° | — | — |
| 1978 | 97° | 59° | 78° | — | — |
| 1977 | 78° | 57° | 68° | — | — |
| 1976 | 85° | 59° | 72° | — | — |
| 1975 | 78° | 50° | 64° | — | — |
| 1974 | 85° | 51° | 68° | — | — |
| 1973warmest | 103° | 57° | 80° | — | — |
| 1972 | 78° | 62° | 70° | 0.05" | — |
| 1971 | 91° | 53° | 72° | — | — |
55 years of data from ESCONDIDO #2