Weather on October 21
San Ramon, CA
55 Years of Data
Avg High
73°F
Avg Low
52°F
Warmest
2003
78°F avg
Coldest
1979
46°F avg
About This Date
October 21st in San Ramon, CA typically brings pleasant fall weather, with average highs around 73°F and lows near 52°F. Over 53 years of records, the warmest October 21st was in 2003 (78°F average), while the coldest was 1979 (46°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 11% of October 21st dates historically, with the wettest October 21st recording 1.42" of rain. 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 October 21st in San Ramon, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 61° | 69° | — | — |
| 2024 | 74° | 58° | 66° | — | — |
| 2023 | 75° | 50° | 63° | — | — |
| 2022 | 85° | 64° | 74° | — | — |
| 2021 | 66° | 51° | 59° | 1.42" | — |
| 2020 | 83° | 69° | 76° | — | — |
| 2019 | 70° | 60° | 65° | — | — |
| 2018 | 79° | 61° | 70° | — | — |
| 2017 | 55° | 42° | 49° | 0.28" | — |
| 2016 | 68° | 51° | 60° | — | — |
| 2015 | 75° | 61° | 68° | — | — |
| 2014 | 60° | 47° | 53° | 0.1" | — |
| 2013 | 78° | 61° | 69° | — | — |
| 2012 | 66° | 44° | 55° | — | — |
| 2011 | 73° | 63° | 68° | — | — |
| 2010 | 72° | 47° | 59° | — | — |
| 2009 | 65° | 49° | 57° | — | — |
| 2008 | 68° | 52° | 60° | — | — |
| 2007 | 60° | 43° | 51° | — | — |
| 2006 | 84° | 59° | 72° | — | — |
| 2005 | 81° | 51° | 66° | — | — |
| 2004 | 67° | 45° | 56° | — | — |
| 2003warmest | 96° | 61° | 78° | — | — |
| 2002 | 81° | 50° | 65° | — | — |
| 2001 | 61° | 49° | 55° | — | — |
| 2000 | 69° | 49° | 59° | — | — |
| 1999 | 85° | 55° | 70° | — | — |
| 1998 | 86° | 55° | 71° | — | — |
| 1997 | 77° | 50° | 64° | — | — |
| 1996 | 69° | 49° | 59° | — | — |
| 1995 | 78° | 52° | 65° | — | — |
| 1994 | 82° | 48° | 65° | — | — |
| 1993 | 74° | 55° | 64° | — | — |
| 1992 | 71° | 53° | 62° | — | — |
| 1991 | 86° | 58° | 72° | — | — |
| 1990 | 78° | 49° | 63° | — | — |
| 1989 | 62° | 49° | 55° | 0.18" | — |
| 1988 | 84° | 59° | 72° | — | — |
| 1986 | 70° | 50° | 60° | — | — |
| 1985 | 65° | 42° | 53° | 1.4" | — |
| 1984 | 62° | 43° | 52° | — | — |
| 1983 | 79° | 56° | 67° | — | — |
| 1982 | 70° | 55° | 62° | — | — |
| 1981 | 77° | 59° | 68° | — | — |
| 1979coldest | 53° | 40° | 46° | 1.12" | — |
| 1978 | 67° | 47° | 57° | — | — |
| 1977 | 73° | 48° | 61° | — | — |
| 1976 | 82° | 56° | 69° | — | — |
| 1975 | 84° | 56° | 70° | — | — |
| 1974 | 74° | 54° | 64° | — | — |
| 1973 | 75° | 50° | 63° | — | — |
| 1972 | 67° | 45° | 56° | — | — |
| 1971 | 71° | 47° | 59° | — | — |
53 years of data from LIVERMORE CALIFORNIA