Weather on September 5
San Marcos, CA
55 Years of Data
About This Date
September 5th in San Marcos, CA typically brings warm fall weather, with average highs around 89°F and lows near 65°F. Over 55 years of records, the warmest September 5th was in 2020 (91°F average), while the coldest was 1985 (66°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 9% of September 5th dates historically, with the wettest September 5th recording 0.71" of rain. The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
Planning for September 5th in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 66° | 79° | — | — |
| 2024 | 104° | 71° | 88° | — | — |
| 2023 | 74° | 65° | 69° | — | — |
| 2022 | 98° | 75° | 87° | — | — |
| 2021 | 96° | 67° | 81° | — | — |
| 2020warmest | 111° | 72° | 91° | — | — |
| 2019 | 98° | 73° | 86° | — | — |
| 2018 | 83° | 67° | 75° | — | — |
| 2017 | 86° | 67° | 76° | — | — |
| 2016 | 78° | 62° | 70° | — | — |
| 2015 | 84° | 64° | 74° | — | — |
| 2014 | 88° | 65° | 76° | — | — |
| 2013 | 97° | 74° | 85° | — | — |
| 2012 | 93° | 73° | 83° | — | — |
| 2011 | 82° | 65° | 73° | 0.03" | — |
| 2010 | 89° | 62° | 76° | — | — |
| 2009 | 78° | 67° | 72° | — | — |
| 2008 | 77° | 65° | 71° | — | — |
| 2007 | 97° | 67° | 82° | — | — |
| 2006 | 82° | 68° | 75° | — | — |
| 2005 | 78° | 57° | 68° | 0.03" | — |
| 2004 | 100° | 67° | 83° | — | — |
| 2003 | 100° | 70° | 85° | — | — |
| 2002 | 89° | 67° | 78° | — | — |
| 2001 | 92° | 63° | 77° | — | — |
| 2000 | 87° | 56° | 71° | — | — |
| 1999 | 77° | 58° | 67° | — | — |
| 1998 | 87° | 69° | 78° | — | — |
| 1997 | 93° | 70° | 81° | — | — |
| 1996 | 86° | 64° | 75° | — | — |
| 1995 | 101° | 68° | 84° | — | — |
| 1994 | 95° | 61° | 78° | — | — |
| 1993 | 86° | 64° | 75° | — | — |
| 1992 | 90° | 58° | 74° | — | — |
| 1991 | 80° | 62° | 71° | 0.08" | — |
| 1990 | 92° | 69° | 80° | — | — |
| 1989 | 97° | 61° | 79° | — | — |
| 1988 | 104° | 76° | 90° | — | — |
| 1987 | 85° | 59° | 72° | — | — |
| 1986 | 88° | 60° | 74° | — | — |
| 1985coldest | 71° | 60° | 66° | 0.03" | — |
| 1984 | 108° | 71° | 89° | — | — |
| 1983 | 88° | 63° | 75° | — | — |
| 1982 | 97° | 63° | 80° | — | — |
| 1981 | 81° | 64° | 72° | — | — |
| 1980 | 82° | 61° | 71° | — | — |
| 1979 | 90° | 58° | 74° | — | — |
| 1978 | 77° | 68° | 73° | 0.71" | — |
| 1977 | 92° | 62° | 77° | — | — |
| 1976 | 82° | 64° | 73° | — | — |
| 1975 | 92° | 60° | 76° | — | — |
| 1974 | 92° | 64° | 78° | — | — |
| 1973 | 80° | 61° | 70° | — | — |
| 1972 | 92° | 64° | 78° | — | — |
| 1971 | 88° | 53° | 70° | — | — |
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.