Weather on September 23
San Ramon, CA
55 Years of Data
Avg High
82°F
Avg Low
57°F
Warmest
2009
85°F avg
Coldest
2007
51°F avg
About This Date
September 23rd in San Ramon, CA typically brings warm fall weather, with average highs around 82°F and lows near 57°F — a 25°F daily swing. Over 55 years of records, the warmest September 23rd was in 2009 (85°F average), while the coldest was 2007 (51°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 23rd dates historically. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for September 23rd in San Ramon, CA? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 67° | 76° | — | — |
| 2024 | 87° | 58° | 72° | — | — |
| 2023 | 72° | 52° | 62° | — | — |
| 2022 | 74° | 58° | 66° | — | — |
| 2021 | 87° | 66° | 77° | — | — |
| 2020 | 78° | 61° | 69° | — | — |
| 2019 | 81° | 57° | 69° | — | — |
| 2018 | 84° | 63° | 73° | — | — |
| 2017 | 67° | 54° | 60° | — | — |
| 2016 | 75° | 44° | 60° | — | — |
| 2015 | 74° | 60° | 67° | — | — |
| 2014 | 79° | 56° | 67° | — | — |
| 2013 | 68° | 52° | 60° | — | — |
| 2012 | 85° | 69° | 77° | — | — |
| 2011 | 91° | 75° | 83° | — | — |
| 2010 | 70° | 46° | 58° | — | — |
| 2009warmest | 95° | 75° | 85° | — | — |
| 2008 | 82° | 51° | 67° | — | — |
| 2007coldest | 59° | 42° | 51° | 0.1" | — |
| 2006 | 88° | 57° | 72° | — | — |
| 2005 | 70° | 50° | 60° | — | — |
| 2004 | 92° | 60° | 76° | — | — |
| 2003 | 87° | 57° | 72° | — | — |
| 2002 | 101° | 67° | 84° | — | — |
| 2001 | 81° | 52° | 66° | — | — |
| 2000 | 81° | 52° | 66° | — | — |
| 1999 | 86° | 57° | 72° | — | — |
| 1998 | 74° | 54° | 64° | — | — |
| 1997 | 95° | 61° | 78° | — | — |
| 1996 | 77° | 51° | 64° | — | — |
| 1995 | 82° | 54° | 68° | — | — |
| 1994 | 82° | 59° | 71° | — | — |
| 1993 | 86° | 49° | 67° | — | — |
| 1992 | 84° | 57° | 71° | — | — |
| 1991 | 97° | 57° | 77° | — | — |
| 1990 | 75° | 57° | 66° | — | — |
| 1989 | 91° | 64° | 78° | — | — |
| 1988 | 78° | 52° | 65° | — | — |
| 1987 | 88° | 60° | 74° | — | — |
| 1986 | 76° | 47° | 61° | — | — |
| 1985 | 85° | 63° | 74° | — | — |
| 1984 | 82° | 50° | 66° | — | — |
| 1983 | 68° | 55° | 62° | — | — |
| 1982 | 84° | 58° | 71° | — | — |
| 1981 | 84° | 47° | 65° | — | — |
| 1980 | 91° | 63° | 77° | — | — |
| 1979 | 80° | 59° | 70° | — | — |
| 1978 | 90° | 63° | 76° | — | — |
| 1977 | 80° | 60° | 70° | — | — |
| 1976 | 84° | 53° | 69° | — | — |
| 1975 | 92° | 65° | 78° | — | — |
| 1974 | 91° | 66° | 79° | — | — |
| 1973 | 71° | 50° | 61° | 0.41" | — |
| 1972 | 82° | 55° | 69° | — | — |
| 1971 | 84° | 51° | 68° | — | — |
55 years of data from LIVERMORE CALIFORNIA