Weather on June 18
San Marcos, CA
55 Years of Data
Avg High
82°F
Avg Low
59°F
Warmest
1994
84°F avg
Coldest
1975
58°F avg
About This Date
June 18th in San Marcos, CA typically brings warm summer weather, with average highs around 82°F and lows near 59°F. Over 55 years of records, the warmest June 18th was in 1994 (84°F average), while the coldest was 1975 (58°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 4% of June 18th dates historically. The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
Planning for June 18th 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 | 91° | 62° | 77° | — | — |
| 2024 | 82° | 60° | 71° | — | — |
| 2023 | 80° | 62° | 71° | — | — |
| 2022 | 81° | 60° | 70° | — | — |
| 2021 | 86° | 63° | 74° | — | — |
| 2020 | 79° | 60° | 69° | — | — |
| 2019 | 73° | 60° | 67° | — | — |
| 2018 | 77° | 61° | 69° | — | — |
| 2017 | 90° | 61° | 75° | — | — |
| 2016 | 94° | 59° | 76° | — | — |
| 2015 | 92° | 61° | 76° | — | — |
| 2014 | 80° | 58° | 69° | — | — |
| 2013 | 84° | 58° | 71° | — | — |
| 2012 | 83° | 61° | 72° | — | — |
| 2011 | 77° | 59° | 68° | — | — |
| 2010 | 69° | 61° | 65° | — | — |
| 2009 | 70° | 63° | 66° | — | — |
| 2008 | 80° | 59° | 70° | — | — |
| 2007 | 68° | 58° | 63° | — | — |
| 2006 | 89° | 64° | 77° | — | — |
| 2005 | 77° | 60° | 69° | — | — |
| 2004 | 75° | 61° | 68° | — | — |
| 2003 | 78° | 60° | 69° | — | — |
| 2002 | 89° | 57° | 73° | — | — |
| 2001 | 89° | 57° | 73° | — | — |
| 2000 | 80° | 63° | 71° | — | — |
| 1999 | 82° | 56° | 69° | — | — |
| 1998 | 81° | 55° | 68° | — | — |
| 1997 | 86° | 62° | 74° | — | — |
| 1996 | 92° | 56° | 74° | — | — |
| 1995 | 79° | 53° | 66° | — | — |
| 1994warmest | 85° | 83° | 84° | — | — |
| 1993 | 89° | 60° | 75° | — | — |
| 1992 | 81° | 56° | 68° | — | — |
| 1991 | 82° | 58° | 70° | — | — |
| 1990 | 77° | 76° | 76° | — | — |
| 1989 | 95° | 57° | 76° | — | — |
| 1988 | 76° | 59° | 67° | — | — |
| 1987 | 82° | 55° | 69° | — | — |
| 1986 | 84° | 55° | 70° | — | — |
| 1985 | 84° | 60° | 72° | — | — |
| 1984 | 86° | 60° | 73° | — | — |
| 1983 | 82° | 58° | 70° | — | — |
| 1982 | 63° | 56° | 59° | 0.13" | — |
| 1981 | 99° | 58° | 78° | — | — |
| 1980 | 80° | 54° | 67° | — | — |
| 1979 | 75° | 55° | 65° | — | — |
| 1978 | 92° | 59° | 75° | — | — |
| 1977 | 83° | 48° | 65° | — | — |
| 1976 | 88° | 56° | 72° | — | — |
| 1975coldest | 64° | 52° | 58° | 0.2" | — |
| 1974 | 80° | 51° | 66° | — | — |
| 1973 | 85° | 51° | 68° | — | — |
| 1972 | 82° | 59° | 71° | — | — |
| 1971 | 87° | 55° | 71° | — | — |
55 years of data from ESCONDIDO #2