Weather on September 7
San Marcos, CA
55 Years of Data
Avg High
89°F
Avg Low
64°F
Warmest
2024
91°F avg
Coldest
1978
66°F avg
About This Date
September 7th in San Marcos, CA typically brings warm fall weather, with average highs around 89°F and lows near 64°F — a 25°F daily swing. Over 55 years of records, the warmest September 7th was in 2024 (91°F average), while the coldest was 1978 (66°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 5% of September 7th dates historically. The last decade has been 6.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.0°F warmer on this date compared to 20-30 years ago.
Planning for September 7th in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 67° | 82° | — | — |
| 2024warmest | 106° | 76° | 91° | — | — |
| 2023 | 89° | 63° | 76° | — | — |
| 2022 | 103° | 71° | 87° | — | — |
| 2021 | 92° | 66° | 79° | — | — |
| 2020 | 95° | 73° | 84° | — | — |
| 2019 | 96° | 68° | 82° | — | — |
| 2018 | 87° | 66° | 77° | — | — |
| 2017 | 87° | 65° | 76° | — | — |
| 2016 | 85° | 63° | 74° | — | — |
| 2015 | 96° | 70° | 83° | — | — |
| 2014 | 98° | 73° | 86° | — | — |
| 2013 | 99° | 74° | 86° | — | — |
| 2012 | 86° | 67° | 76° | — | — |
| 2011 | 100° | 73° | 87° | — | — |
| 2010 | 75° | 60° | 68° | — | — |
| 2009 | 74° | 64° | 69° | — | — |
| 2008 | 74° | 65° | 69° | 0.03" | — |
| 2007 | 82° | 60° | 71° | — | — |
| 2006 | 73° | 64° | 69° | — | — |
| 2005 | 75° | 61° | 68° | — | — |
| 2004 | 101° | 56° | 78° | — | — |
| 2003 | 94° | 65° | 79° | — | — |
| 2002 | 84° | 64° | 74° | — | — |
| 2001 | 81° | 60° | 70° | — | — |
| 2000 | 91° | 57° | 74° | — | — |
| 1999 | 87° | 61° | 74° | — | — |
| 1998 | 87° | 69° | 78° | — | — |
| 1997 | 90° | 67° | 78° | — | — |
| 1996 | 88° | 63° | 75° | — | — |
| 1995 | 96° | 69° | 83° | — | — |
| 1994 | 90° | 65° | 77° | — | — |
| 1993 | 94° | 61° | 77° | — | — |
| 1992 | 86° | 58° | 72° | — | — |
| 1991 | 79° | 63° | 71° | — | — |
| 1990 | 95° | 66° | 81° | — | — |
| 1989 | 89° | 57° | 73° | — | — |
| 1988 | 92° | 65° | 78° | — | — |
| 1987 | 91° | 55° | 73° | — | — |
| 1986 | 89° | 61° | 75° | — | — |
| 1985 | 80° | 56° | 68° | — | — |
| 1984 | 101° | 65° | 83° | — | — |
| 1983 | 91° | 65° | 78° | — | — |
| 1982 | 94° | 64° | 79° | — | — |
| 1981 | 90° | 65° | 77° | — | — |
| 1980 | 79° | 61° | 70° | — | — |
| 1979 | 90° | 61° | 75° | — | — |
| 1978coldest | 76° | 56° | 66° | — | — |
| 1977 | 95° | 64° | 80° | — | — |
| 1976 | 89° | 62° | 76° | — | — |
| 1975 | 86° | 53° | 70° | 0.15" | — |
| 1974 | 92° | 63° | 77° | — | — |
| 1973 | 84° | 56° | 70° | — | — |
| 1972 | 69° | 65° | 67° | 0.08" | — |
| 1971 | 90° | 62° | 76° | — | — |
55 years of data from ESCONDIDO #2