Weather on September 12
San Ramon, CA
55 Years of Data
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° | — | — |
San Ramon, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Ramon, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
San Ramon, 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 Ramon, CA
San Ramon, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.