Weather on May 18
San Ramon, CA
55 Years of Data
Avg High
71°F
Avg Low
50°F
Warmest
2009
82°F avg
Coldest
1974
44°F avg
About This Date
May 18th in San Ramon, CA typically brings pleasant spring weather, with average highs around 71°F and lows near 50°F. Over 55 years of records, the warmest May 18th was in 2009 (82°F average), while the coldest was 1974 (44°F) — a 38°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 18th dates historically, with the wettest May 18th recording 1.63" of rain. The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
Planning for May 18th 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 | 65° | 44° | 54° | — | — |
| 2024 | 77° | 46° | 62° | — | — |
| 2023 | 81° | 59° | 70° | — | — |
| 2022 | 76° | 58° | 67° | — | — |
| 2021 | 62° | 48° | 55° | — | — |
| 2020 | 63° | 47° | 55° | 1.07" | — |
| 2019 | 55° | 40° | 47° | — | — |
| 2018 | 55° | 44° | 50° | — | — |
| 2017 | 67° | 47° | 57° | — | — |
| 2016 | 81° | 64° | 72° | — | — |
| 2015 | 57° | 43° | 50° | — | — |
| 2014 | 65° | 46° | 55° | — | — |
| 2013 | 62° | 42° | 52° | — | — |
| 2012 | 76° | 46° | 61° | — | — |
| 2011 | 46° | 42° | 44° | 1.63" | — |
| 2010 | 54° | 44° | 49° | 0.18" | — |
| 2009warmest | 92° | 73° | 82° | — | — |
| 2008 | 94° | 67° | 80° | — | — |
| 2007 | 73° | 47° | 60° | — | — |
| 2006 | 87° | 50° | 69° | — | — |
| 2005 | 68° | 55° | 62° | — | — |
| 2004 | 69° | 50° | 60° | — | — |
| 2003 | 75° | 49° | 62° | — | — |
| 2002 | 66° | 46° | 56° | — | — |
| 2001 | 84° | 51° | 68° | — | — |
| 2000 | 81° | 50° | 65° | — | — |
| 1999 | 64° | 48° | 56° | — | — |
| 1998 | 70° | 44° | 57° | — | — |
| 1997 | 92° | 63° | 77° | — | — |
| 1996 | 67° | 53° | 60° | — | — |
| 1995 | 79° | 50° | 64° | — | — |
| 1994 | 66° | 49° | 57° | — | — |
| 1993 | 77° | 49° | 63° | — | — |
| 1992 | 73° | 52° | 62° | — | — |
| 1991 | 55° | 42° | 49° | — | — |
| 1990 | 57° | 49° | 53° | — | — |
| 1989 | 64° | 42° | 53° | — | — |
| 1988 | 75° | 41° | 58° | — | — |
| 1987 | 65° | 46° | 55° | — | — |
| 1986 | 86° | 62° | 74° | — | — |
| 1985 | 64° | 42° | 53° | — | — |
| 1984 | 68° | 50° | 59° | — | — |
| 1983 | 78° | 58° | 68° | — | — |
| 1982 | 62° | 42° | 52° | — | — |
| 1981 | 70° | 46° | 58° | 0.05" | — |
| 1980 | 79° | 58° | 68° | — | — |
| 1979 | 85° | 66° | 75° | — | — |
| 1978 | 79° | 57° | 68° | — | — |
| 1977 | 66° | 39° | 53° | — | — |
| 1976 | 73° | 40° | 56° | — | — |
| 1975 | 86° | 63° | 74° | — | — |
| 1974coldest | 56° | 33° | 44° | — | — |
| 1973 | 94° | 57° | 75° | — | — |
| 1972 | 69° | 41° | 55° | — | — |
| 1971 | 75° | 48° | 62° | — | — |
55 years of data from LIVERMORE CALIFORNIA