Weather on September 15
San Ramon, CA
55 Years of Data
Avg High
80°F
Avg Low
56°F
Warmest
1971
94°F avg
Coldest
1986
54°F avg
About This Date
September 15th in San Ramon, CA typically brings warm fall weather, with average highs around 80°F and lows near 56°F. Over 55 years of records, the warmest September 15th was in 1971 (94°F average), while the coldest was 1986 (54°F) — a 40°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 15th in San Ramon, CA? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 57° | 67° | — | — |
| 2024 | 83° | 51° | 67° | — | — |
| 2023 | 82° | 62° | 72° | — | — |
| 2022 | 65° | 51° | 58° | — | — |
| 2021 | 89° | 67° | 78° | — | — |
| 2020 | 80° | 63° | 71° | — | — |
| 2019 | 89° | 65° | 77° | — | — |
| 2018 | 74° | 47° | 60° | — | — |
| 2017 | 70° | 53° | 61° | — | — |
| 2016 | 67° | 46° | 56° | — | — |
| 2015 | 59° | 50° | 55° | — | — |
| 2014 | 87° | 69° | 78° | — | — |
| 2013 | 77° | 54° | 65° | — | — |
| 2012 | 85° | 67° | 76° | — | — |
| 2011 | 79° | 50° | 64° | — | — |
| 2010 | 76° | 60° | 68° | — | — |
| 2009 | 68° | 52° | 60° | — | — |
| 2008 | 86° | 59° | 73° | — | — |
| 2007 | 71° | 44° | 58° | — | — |
| 2006 | 68° | 50° | 59° | — | — |
| 2005 | 79° | 50° | 64° | — | — |
| 2004 | 95° | 64° | 80° | — | — |
| 2003 | 81° | 54° | 67° | — | — |
| 2002 | 74° | 54° | 64° | — | — |
| 2001 | 81° | 54° | 67° | — | — |
| 2000 | 77° | 56° | 66° | — | — |
| 1999 | 86° | 52° | 69° | — | — |
| 1998 | 80° | 55° | 68° | — | — |
| 1997 | 76° | 53° | 64° | — | — |
| 1996 | 71° | 54° | 62° | — | — |
| 1995 | 78° | 56° | 67° | — | — |
| 1994 | 93° | 59° | 76° | — | — |
| 1993 | 72° | 53° | 62° | — | — |
| 1992 | 81° | 49° | 65° | — | — |
| 1991 | 90° | 52° | 71° | — | — |
| 1990 | 77° | 53° | 65° | — | — |
| 1989 | 92° | 66° | 79° | — | — |
| 1988 | 84° | 53° | 69° | — | — |
| 1987 | 70° | 50° | 60° | — | — |
| 1986coldest | 65° | 44° | 54° | — | — |
| 1985 | 72° | 53° | 62° | — | — |
| 1984 | 90° | 65° | 77° | — | — |
| 1983 | 96° | 72° | 84° | — | — |
| 1982 | 74° | 52° | 63° | — | — |
| 1981 | 82° | 66° | 74° | — | — |
| 1980 | 68° | 44° | 56° | — | — |
| 1979 | 99° | 73° | 86° | — | — |
| 1978 | 80° | 58° | 69° | — | — |
| 1977 | 62° | 50° | 56° | — | — |
| 1976 | 86° | 48° | 67° | — | — |
| 1975 | 83° | 48° | 65° | — | — |
| 1974 | 85° | 57° | 71° | — | — |
| 1973 | 75° | 51° | 63° | — | — |
| 1972 | 84° | 46° | 65° | — | — |
| 1971warmest | 105° | 83° | 94° | — | — |
55 years of data from LIVERMORE CALIFORNIA