Weather on September 13
San Ramon, CA
55 Years of Data
Avg High
82°F
Avg Low
57°F
Warmest
1979
87°F avg
Coldest
2007
52°F avg
About This Date
September 13th 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 54 years of records, the warmest September 13th was in 1979 (87°F average), while the coldest was 2007 (52°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 13th dates historically. The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.
Planning for September 13th in San Ramon, CA? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 53° | 65° | — | — |
| 2024 | 80° | 54° | 67° | — | — |
| 2023 | 80° | 62° | 71° | — | — |
| 2022 | 81° | 51° | 66° | — | — |
| 2021 | 85° | 67° | 76° | — | — |
| 2020 | 83° | 67° | 75° | — | — |
| 2019 | 86° | 70° | 78° | — | — |
| 2018 | 65° | 49° | 57° | — | — |
| 2017 | 81° | 55° | 68° | — | — |
| 2016 | 72° | 48° | 60° | — | — |
| 2015 | 82° | 67° | 74° | — | — |
| 2014 | 92° | 75° | 83° | — | — |
| 2013 | 79° | 56° | 67° | — | — |
| 2012 | 83° | 69° | 76° | — | — |
| 2011 | 79° | 63° | 71° | — | — |
| 2010 | 82° | 56° | 69° | — | — |
| 2009 | 81° | 49° | 65° | 0.05" | — |
| 2008 | 80° | 59° | 70° | — | — |
| 2007coldest | 63° | 42° | 52° | — | — |
| 2006 | 96° | 56° | 76° | — | — |
| 2005 | 73° | 49° | 61° | — | — |
| 2004 | 79° | 55° | 67° | — | — |
| 2003 | 98° | 71° | 85° | — | — |
| 2002 | 88° | 51° | 69° | — | — |
| 2001 | 81° | 56° | 68° | — | — |
| 2000 | 99° | 71° | 85° | — | — |
| 1999 | 79° | 54° | 66° | — | — |
| 1998 | 95° | 64° | 80° | — | — |
| 1997 | 76° | 57° | 66° | — | — |
| 1996 | 69° | 55° | 62° | — | — |
| 1995 | 83° | 54° | 68° | — | — |
| 1994 | 76° | 52° | 64° | — | — |
| 1993 | 87° | 55° | 71° | — | — |
| 1992 | 88° | 61° | 74° | — | — |
| 1991 | 80° | 52° | 66° | — | — |
| 1990 | 79° | 53° | 66° | — | — |
| 1989 | 87° | 47° | 67° | — | — |
| 1988 | 84° | 46° | 65° | — | — |
| 1987 | 66° | 48° | 57° | — | — |
| 1986 | 64° | 47° | 55° | — | — |
| 1985 | 74° | 48° | 61° | — | — |
| 1984 | 85° | 62° | 73° | — | — |
| 1983 | 98° | 71° | 85° | — | — |
| 1982 | 85° | 65° | 75° | — | — |
| 1981 | 85° | 60° | 72° | — | — |
| 1980 | 79° | 47° | 63° | — | — |
| 1979warmest | 100° | 74° | 87° | — | — |
| 1978 | 80° | 59° | 70° | — | — |
| 1977 | 82° | 53° | 68° | — | — |
| 1976 | 79° | 54° | 66° | — | — |
| 1975 | 86° | 61° | 73° | — | — |
| 1974 | 83° | 49° | 66° | — | — |
| 1973 | 86° | 52° | 69° | — | — |
| 1971 | 102° | 70° | 86° | — | — |
54 years of data from LIVERMORE CALIFORNIA