Weather on September 17
San Ramon, CA
55 Years of Data
Avg High
79°F
Avg Low
55°F
Warmest
1971
84°F avg
Coldest
1977
52°F avg
About This Date
September 17th in San Ramon, CA typically brings pleasant fall weather, with average highs around 79°F and lows near 55°F. Over 55 years of records, the warmest September 17th was in 1971 (84°F average), while the coldest was 1977 (52°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 7% of September 17th dates historically, with the wettest September 17th recording 1.45" of rain. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for September 17th in San Ramon, CA? Great weather for outdoor activities.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 71° | 80° | — | — |
| 2024 | 67° | 49° | 58° | — | — |
| 2023 | 71° | 52° | 61° | — | — |
| 2022 | 75° | 49° | 62° | — | — |
| 2021 | 73° | 56° | 64° | — | — |
| 2020 | 81° | 62° | 71° | — | — |
| 2019 | 81° | 64° | 72° | — | — |
| 2018 | 71° | 53° | 62° | — | — |
| 2017 | 77° | 61° | 69° | — | — |
| 2016 | 82° | 52° | 67° | — | — |
| 2015 | 67° | 49° | 58° | — | — |
| 2014 | 83° | 59° | 71° | — | — |
| 2013 | 78° | 50° | 64° | — | — |
| 2012 | 84° | 63° | 73° | — | — |
| 2011 | 69° | 51° | 60° | — | — |
| 2010 | 77° | 56° | 66° | — | — |
| 2009 | 79° | 59° | 69° | — | — |
| 2008 | 76° | 46° | 61° | — | — |
| 2007 | 74° | 43° | 58° | — | — |
| 2006 | 89° | 53° | 71° | — | — |
| 2005 | 72° | 50° | 61° | — | — |
| 2004 | 83° | 59° | 71° | — | — |
| 2003 | 83° | 52° | 67° | — | — |
| 2002 | 83° | 54° | 68° | — | — |
| 2001 | 81° | 53° | 67° | — | — |
| 2000 | 94° | 60° | 77° | — | — |
| 1999 | 82° | 53° | 68° | — | — |
| 1998 | 77° | 54° | 65° | — | — |
| 1997 | 78° | 56° | 67° | — | — |
| 1996 | 81° | 53° | 67° | — | — |
| 1995 | 87° | 56° | 71° | — | — |
| 1994 | 80° | 55° | 68° | — | — |
| 1993 | 68° | 52° | 60° | — | — |
| 1992 | 80° | 56° | 68° | — | — |
| 1991 | 93° | 59° | 76° | — | — |
| 1990 | 83° | 56° | 69° | — | — |
| 1989 | 63° | 47° | 55° | 1.45" | — |
| 1988 | 81° | 59° | 70° | — | — |
| 1987 | 84° | 59° | 72° | — | — |
| 1986 | 65° | 51° | 58° | 0.05" | — |
| 1985 | 77° | 45° | 61° | — | — |
| 1984 | 93° | 76° | 84° | — | — |
| 1983 | 87° | 66° | 77° | — | — |
| 1982 | 61° | 51° | 56° | 0.89" | — |
| 1981 | 79° | 60° | 69° | — | — |
| 1980 | 75° | 52° | 63° | — | — |
| 1979 | 97° | 72° | 84° | — | — |
| 1978 | 87° | 50° | 69° | — | — |
| 1977coldest | 55° | 49° | 52° | 0.43" | — |
| 1976 | 72° | 49° | 60° | — | — |
| 1975 | 88° | 56° | 72° | — | — |
| 1974 | 90° | 58° | 74° | — | — |
| 1973 | 73° | 45° | 59° | — | — |
| 1972 | 78° | 47° | 62° | — | — |
| 1971warmest | 98° | 69° | 84° | — | — |
55 years of data from LIVERMORE CALIFORNIA