Weather on May 21
San Ramon, CA
55 Years of Data
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 56 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 6.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 6.1°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 |
|---|---|---|---|---|---|
| 2026 | 92° | 55° | 73° | — | — |
| 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° | — | — |
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.