Weather on September 27
San Ramon, CA
55 Years of Data
Avg High
79°F
Avg Low
56°F
Warmest
2009
87°F avg
Coldest
1986
52°F avg
About This Date
September 27th in San Ramon, CA typically brings pleasant fall weather, with average highs around 79°F and lows near 56°F. Over 55 years of records, the warmest September 27th was in 2009 (87°F average), while the coldest was 1986 (52°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 5% of September 27th dates historically, with the wettest September 27th recording 1.24" of rain. The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for September 27th in San Ramon, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 65° | 74° | — | — |
| 2024 | 81° | 50° | 65° | — | — |
| 2023 | 71° | 52° | 61° | — | — |
| 2022 | 82° | 60° | 71° | — | — |
| 2021 | 71° | 47° | 59° | — | — |
| 2020 | 82° | 61° | 71° | — | — |
| 2019 | 76° | 54° | 65° | — | — |
| 2018 | 90° | 66° | 78° | — | — |
| 2017 | 82° | 64° | 73° | — | — |
| 2016 | 92° | 71° | 81° | — | — |
| 2015 | 85° | 60° | 72° | — | — |
| 2014 | 67° | 50° | 58° | — | — |
| 2013 | 69° | 51° | 60° | — | — |
| 2012 | 81° | 67° | 74° | — | — |
| 2011 | — | 56° | — | — | — |
| 2010 | 91° | 72° | 81° | — | — |
| 2009warmest | 97° | 77° | 87° | — | — |
| 2008 | 86° | 68° | 77° | — | — |
| 2007 | 83° | 54° | 68° | — | — |
| 2006 | 81° | 53° | 67° | — | — |
| 2005 | 83° | 53° | 68° | — | — |
| 2004 | 70° | 51° | 60° | — | — |
| 2003 | 80° | 55° | 68° | — | — |
| 2002 | 67° | 56° | 61° | — | — |
| 2001 | 72° | 53° | 62° | — | — |
| 2000 | 71° | 56° | 63° | — | — |
| 1999 | 90° | 71° | 80° | — | — |
| 1998 | 63° | 51° | 57° | — | — |
| 1997 | 88° | 55° | 71° | — | — |
| 1996 | 82° | 52° | 67° | — | — |
| 1995 | 76° | 55° | 65° | — | — |
| 1994 | 82° | 56° | 69° | — | — |
| 1993 | 95° | 61° | 78° | — | — |
| 1992 | 96° | 63° | 79° | — | — |
| 1991 | 76° | 54° | 65° | — | — |
| 1990 | 80° | 55° | 68° | — | — |
| 1989 | 73° | 50° | 62° | — | — |
| 1988 | 77° | 47° | 62° | — | — |
| 1987 | 85° | 63° | 74° | — | — |
| 1986coldest | 61° | 44° | 52° | 1.24" | — |
| 1985 | 72° | 53° | 62° | — | — |
| 1984 | 86° | 65° | 75° | — | — |
| 1983 | 67° | 51° | 59° | — | — |
| 1982 | 69° | 47° | 58° | — | — |
| 1981 | 78° | 56° | 67° | — | — |
| 1980 | 83° | 46° | 64° | — | — |
| 1979 | 76° | 53° | 64° | — | — |
| 1978 | 84° | 57° | 71° | — | — |
| 1977 | 74° | 56° | 65° | — | — |
| 1976 | 77° | 53° | 65° | — | — |
| 1975 | 94° | 67° | 80° | — | — |
| 1974 | 90° | 47° | 68° | — | — |
| 1973 | 86° | 48° | 67° | — | — |
| 1972 | 61° | 58° | 59° | 1.22" | — |
| 1971 | 63° | 43° | 53° | 0.3" | — |
55 years of data from LIVERMORE CALIFORNIA