Weather on June 18
San Marcos, CA
55 Years of Data
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 56 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 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°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.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 80° | 63° | 71° | — | — |
| 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° | 0.05" | — |
| 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° | 0.08" | — |
| 1974 | 80° | 51° | 66° | — | — |
| 1973 | 85° | 51° | 68° | — | — |
| 1972 | 82° | 59° | 71° | — | — |
| 1971 | 87° | 55° | 71° | — | — |
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: January, February, March, April, May, June, September, October, November, December.
What to expect on June 18th
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
June 18th outlook →