Weather on September 1
San Marcos, CA
55 Years of Data
Avg High
88°F
Avg Low
64°F
Warmest
2017
89°F avg
Coldest
1973
67°F avg
About This Date
September 1st in San Marcos, CA typically brings warm fall weather, with average highs around 88°F and lows near 64°F. Over 55 years of records, the warmest September 1st was in 2017 (89°F average), while the coldest was 1973 (67°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 1st dates historically. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 94° | 67° | 80° | — | — |
| 2024 | 92° | 64° | 78° | — | — |
| 2023 | 88° | 68° | 78° | — | — |
| 2022 | 104° | 70° | 87° | — | — |
| 2021 | 78° | 65° | 71° | — | — |
| 2020 | 85° | 66° | 75° | — | — |
| 2019 | 93° | 68° | 81° | — | — |
| 2018 | 82° | 67° | 74° | — | — |
| 2017warmest | 105° | 73° | 89° | — | — |
| 2016 | 88° | 67° | 77° | — | — |
| 2015 | 85° | 67° | 76° | — | — |
| 2014 | 89° | 66° | 78° | — | — |
| 2013 | 92° | 73° | 82° | — | — |
| 2012 | 92° | 64° | 78° | — | — |
| 2011 | 86° | 61° | 73° | — | — |
| 2010 | 85° | 58° | 71° | — | — |
| 2009 | 83° | 69° | 76° | — | — |
| 2008 | 74° | 67° | 70° | — | — |
| 2007 | 102° | 66° | 84° | — | — |
| 2006 | 75° | 64° | 70° | — | — |
| 2005 | 73° | 61° | 67° | — | — |
| 2004 | 99° | 60° | 79° | — | — |
| 2003 | 90° | 67° | 78° | — | — |
| 2002 | 106° | 67° | 86° | — | — |
| 2001 | 89° | 62° | 76° | — | — |
| 2000 | 78° | 60° | 69° | — | — |
| 1999 | 79° | 58° | 68° | — | — |
| 1998 | 101° | 76° | 88° | — | — |
| 1997 | 92° | 64° | 78° | — | — |
| 1996 | 93° | 64° | 79° | — | — |
| 1995 | 98° | 67° | 82° | — | — |
| 1994 | 84° | 60° | 72° | — | — |
| 1993 | 88° | 64° | 76° | — | — |
| 1992 | 81° | 57° | 69° | — | — |
| 1991 | 90° | 61° | 75° | — | — |
| 1990 | 85° | 62° | 73° | — | — |
| 1989 | 90° | 55° | 72° | — | — |
| 1988 | 89° | 63° | 76° | — | — |
| 1987 | 104° | 60° | 82° | — | — |
| 1986 | 81° | 60° | 70° | — | — |
| 1985 | 93° | 67° | 80° | — | — |
| 1984 | 86° | 65° | 75° | — | — |
| 1983 | 88° | 65° | 76° | 0.08" | — |
| 1982 | 98° | 62° | 80° | — | — |
| 1981 | 86° | 60° | 73° | — | — |
| 1980 | 80° | 62° | 71° | — | — |
| 1979 | 82° | 62° | 72° | — | — |
| 1978 | 88° | 61° | 74° | — | — |
| 1977 | 82° | 61° | 71° | — | — |
| 1976 | 85° | 64° | 74° | — | — |
| 1975 | 83° | 56° | 69° | — | — |
| 1974 | 89° | 57° | 73° | — | — |
| 1973coldest | 81° | 53° | 67° | — | — |
| 1972 | 88° | 67° | 77° | — | — |
| 1971 | 89° | 57° | 73° | — | — |
55 years of data from ESCONDIDO #2