Weather on May 21
San Ramon, CA
55 Years of Data
Avg High
72°F
Avg Low
49°F
Warmest
2000
80°F avg
Coldest
2016
47°F avg
About This Date
May 21st in San Ramon, CA typically brings pleasant spring weather, with average highs around 72°F and lows near 49°F. Over 55 years of records, the warmest May 21st was in 2000 (80°F average), while the coldest was 2016 (47°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 21st dates historically. The last decade has been 7.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 7.5°F cooler on this date compared to 20-30 years ago.
Planning for May 21st in San Ramon, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 51° | 63° | — | — |
| 2024 | 71° | 56° | 63° | — | — |
| 2023 | 74° | 49° | 61° | — | — |
| 2022 | 71° | 55° | 63° | — | — |
| 2021 | 59° | 43° | 51° | 0.08" | — |
| 2020 | 67° | 46° | 56° | — | — |
| 2019 | 54° | 43° | 48° | 0.23" | — |
| 2018 | 58° | 43° | 50° | — | — |
| 2017 | 83° | 66° | 74° | — | — |
| 2016coldest | 52° | 42° | 47° | — | — |
| 2015 | 57° | 47° | 52° | — | — |
| 2014 | 65° | 46° | 55° | — | — |
| 2013 | 82° | 56° | 69° | — | — |
| 2012 | 82° | 60° | 71° | — | — |
| 2011 | 68° | 43° | 55° | — | — |
| 2010 | 62° | 41° | 52° | — | — |
| 2009 | 72° | 49° | 60° | — | — |
| 2008 | 73° | 38° | 55° | — | — |
| 2007 | 84° | 51° | 68° | — | — |
| 2006 | 70° | 51° | 60° | — | — |
| 2005 | 81° | 51° | 66° | — | — |
| 2004 | 63° | 52° | 57° | — | — |
| 2003 | 92° | 58° | 75° | — | — |
| 2002 | 66° | 46° | 56° | — | — |
| 2001 | 96° | 63° | 79° | — | — |
| 2000warmest | 96° | 65° | 80° | — | — |
| 1999 | 78° | 44° | 61° | — | — |
| 1998 | 63° | 47° | 55° | — | — |
| 1997 | 80° | 51° | 66° | — | — |
| 1996 | 63° | 50° | 56° | — | — |
| 1995 | 57° | 51° | 54° | — | — |
| 1994 | 66° | 49° | 57° | — | — |
| 1993 | 69° | 53° | 61° | — | — |
| 1992 | 83° | 50° | 66° | — | — |
| 1991 | 77° | 47° | 62° | — | — |
| 1990 | 68° | 51° | 60° | — | — |
| 1989 | 62° | 40° | 51° | — | — |
| 1988 | 89° | 63° | 76° | — | — |
| 1987 | 66° | 43° | 54° | — | — |
| 1986 | 65° | 39° | 52° | — | — |
| 1985 | 76° | 54° | 65° | — | — |
| 1984 | 73° | 54° | 63° | — | — |
| 1983 | 86° | 61° | 73° | — | — |
| 1982 | 75° | 53° | 64° | — | — |
| 1981 | 63° | 44° | 53° | — | — |
| 1980 | 85° | 42° | 63° | — | — |
| 1979 | 71° | 50° | 61° | — | — |
| 1978 | 84° | 44° | 64° | — | — |
| 1977 | 76° | 49° | 62° | — | — |
| 1976 | 80° | 50° | 65° | — | — |
| 1975 | 63° | 42° | 52° | — | — |
| 1974 | 64° | 33° | 49° | — | — |
| 1973 | 67° | 42° | 54° | — | — |
| 1972 | 56° | 44° | 50° | — | — |
| 1971 | 68° | 41° | 55° | — | — |
55 years of data from LIVERMORE CALIFORNIA