Weather on September 17
San Ramon, CA
55 Years of Data
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.
| 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° | — | — |
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.