Weather on September 12
San Ramon, CA
55 Years of Data
Avg High
83°F
Avg Low
58°F
Warmest
1979
85°F avg
Coldest
1985
55°F avg
About This Date
September 12th in San Ramon, CA typically brings warm fall weather, with average highs around 83°F and lows near 58°F — a 25°F daily swing. Over 54 years of records, the warmest September 12th was in 1979 (85°F average), while the coldest was 1985 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 12th dates historically. 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 September 12th in San Ramon, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 69° | 54° | 61° | — | — |
| 2024 | 77° | 50° | 64° | — | — |
| 2023 | 83° | 58° | 70° | — | — |
| 2022 | 81° | 69° | 75° | — | — |
| 2021 | 84° | 67° | 75° | — | — |
| 2020 | 77° | 65° | 71° | — | — |
| 2019 | 81° | 63° | 72° | — | — |
| 2018 | 79° | 50° | 64° | — | — |
| 2017 | 89° | 67° | 78° | — | — |
| 2016 | 72° | 48° | 60° | — | — |
| 2015 | 95° | 75° | 85° | — | — |
| 2014 | 91° | 73° | 82° | — | — |
| 2013 | 69° | 51° | 60° | — | — |
| 2012 | 81° | 64° | 72° | — | — |
| 2011 | 72° | 58° | 65° | — | — |
| 2010 | 82° | 56° | 69° | — | — |
| 2009 | 93° | 64° | 79° | 0.03" | — |
| 2008 | 85° | 67° | 76° | — | — |
| 2007 | 79° | 45° | 62° | — | — |
| 2006 | 99° | 66° | 82° | — | — |
| 2005 | 73° | 49° | 61° | — | — |
| 2004 | 77° | 58° | 67° | — | — |
| 2003 | 101° | 68° | 84° | — | — |
| 2002 | 88° | 55° | 71° | — | — |
| 2001 | 68° | 54° | 61° | — | — |
| 2000 | 92° | 59° | 75° | — | — |
| 1999 | 84° | 55° | 70° | — | — |
| 1998 | 94° | 62° | 78° | — | — |
| 1997 | 80° | 58° | 69° | — | — |
| 1996 | 76° | 51° | 63° | — | — |
| 1995 | 87° | 55° | 71° | — | — |
| 1994 | 76° | 54° | 65° | — | — |
| 1993 | 84° | 52° | 68° | — | — |
| 1992 | 85° | 54° | 69° | — | — |
| 1991 | 87° | 52° | 69° | — | — |
| 1990 | 82° | 55° | 69° | — | — |
| 1989 | 79° | 46° | 62° | — | — |
| 1988 | 87° | 60° | 74° | — | — |
| 1987 | 72° | 50° | 61° | — | — |
| 1986 | 83° | 48° | 65° | — | — |
| 1985coldest | 65° | 45° | 55° | — | — |
| 1984 | 78° | 57° | 68° | — | — |
| 1983 | 92° | 75° | 83° | — | — |
| 1982 | 84° | 66° | 75° | — | — |
| 1981 | 88° | 67° | 77° | — | — |
| 1980 | 81° | 61° | 71° | — | — |
| 1979warmest | 95° | 75° | 85° | — | — |
| 1978 | 77° | 57° | 67° | — | — |
| 1977 | 81° | 52° | 66° | — | — |
| 1976 | 80° | 52° | 66° | — | — |
| 1975 | 86° | 57° | 72° | — | — |
| 1974 | 85° | 49° | 67° | — | — |
| 1973 | 83° | 53° | 68° | — | — |
| 1971 | 93° | 59° | 76° | — | — |
54 years of data from LIVERMORE CALIFORNIA