Weather on May 9
San Marcos, CA
55 Years of Data
About This Date
May 9th in San Marcos, CA typically brings pleasant spring weather, with average highs around 75°F and lows near 54°F. Over 56 years of records, the warmest May 9th was in 2025 (76°F average), while the coldest was 1977 (56°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 11% of May 9th dates historically, with the wettest May 9th recording 3.91" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 9th in San Marcos, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 68° | 61° | 64° | — | — |
| 2025warmest | 94° | 58° | 76° | — | — |
| 2024 | 78° | 57° | 68° | — | — |
| 2023 | 72° | 55° | 63° | — | — |
| 2022 | 73° | 54° | 63° | — | — |
| 2021 | 75° | 56° | 65° | — | — |
| 2020 | 80° | 62° | 71° | — | — |
| 2019 | 63° | 58° | 60° | — | — |
| 2018 | 84° | 58° | 71° | — | — |
| 2017 | 69° | 57° | 63° | — | — |
| 2016 | 71° | 57° | 64° | 0.03" | — |
| 2015 | 67° | 52° | 59° | — | — |
| 2014 | 77° | 53° | 65° | — | — |
| 2013 | 73° | 57° | 65° | — | — |
| 2012 | 80° | 55° | 68° | — | — |
| 2011 | 63° | 54° | 58° | — | — |
| 2010 | 63° | 56° | 59° | — | — |
| 2009 | 66° | 58° | 62° | — | — |
| 2008 | 61° | 56° | 58° | — | — |
| 2007 | 91° | 57° | 74° | — | — |
| 2006 | 66° | 58° | 62° | — | — |
| 2005 | 74° | 52° | 63° | — | — |
| 2004 | 86° | 52° | 69° | — | — |
| 2003 | 65° | 49° | 57° | 0.03" | — |
| 2002 | 77° | 52° | 64° | — | — |
| 2001 | 89° | 58° | 73° | — | — |
| 2000 | 77° | 48° | 63° | — | — |
| 1999 | 72° | 58° | 65° | — | — |
| 1998 | 64° | 57° | 61° | — | — |
| 1997 | 80° | 58° | 69° | — | — |
| 1996 | 81° | 58° | 69° | — | — |
| 1995 | 71° | 52° | 61° | — | — |
| 1994 | 73° | 52° | 62° | 0.18" | — |
| 1993 | 93° | 53° | 73° | — | — |
| 1992 | 73° | 59° | 66° | 0.1" | — |
| 1991 | 66° | 56° | 61° | — | — |
| 1990 | 74° | 52° | 63° | — | — |
| 1989 | 77° | 58° | 67° | — | — |
| 1988 | 76° | 48° | 62° | — | — |
| 1987 | 82° | 58° | 70° | — | — |
| 1986 | 80° | 48° | 64° | — | — |
| 1985 | 66° | 58° | 62° | — | — |
| 1984 | 91° | 56° | 73° | — | — |
| 1983 | 76° | 55° | 65° | — | — |
| 1982 | 63° | 53° | 58° | 0.03" | — |
| 1981 | 92° | 52° | 72° | — | — |
| 1980 | 68° | 49° | 58° | — | — |
| 1979 | 71° | 46° | 59° | — | — |
| 1978 | 85° | 49° | 67° | — | — |
| 1977coldest | 63° | 50° | 56° | 3.91" | — |
| 1976 | 78° | 54° | 66° | — | — |
| 1975 | 79° | 49° | 64° | — | — |
| 1974 | 63° | 55° | 59° | — | — |
| 1973 | 83° | 50° | 66° | — | — |
| 1972 | 73° | 50° | 62° | — | — |
| 1971 | 72° | 44° | 58° | — | — |
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: June.