Weather on April 21
San Ramon, CA
55 Years of Data
Avg High
66°F
Avg Low
45°F
Warmest
2009
76°F avg
Coldest
2008
39°F avg
About This Date
April 21st in San Ramon, CA typically brings mild spring weather, with average highs around 66°F and lows near 45°F. Over 54 years of records, the warmest April 21st was in 2009 (76°F average), while the coldest was 2008 (39°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 17% of April 21st dates historically, with the wettest April 21st recording 1.78" 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 April 21st in San Ramon, CA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 45° | 60° | — | — |
| 2024 | 71° | 54° | 62° | — | — |
| 2023 | 70° | 46° | 58° | — | — |
| 2022 | 59° | 43° | 51° | 1.78" | — |
| 2021 | 61° | 43° | 52° | — | — |
| 2020 | 56° | 42° | 49° | — | — |
| 2019 | 56° | 42° | 49° | — | — |
| 2018 | 70° | 52° | 61° | — | — |
| 2017 | 68° | 42° | 55° | — | — |
| 2016 | 70° | 49° | 59° | 0.13" | — |
| 2015 | 68° | 44° | 56° | — | — |
| 2014 | 75° | 54° | 64° | — | — |
| 2013 | 72° | 58° | 65° | — | — |
| 2012 | 82° | 65° | 73° | — | — |
| 2011 | 58° | 38° | 48° | 0.91" | — |
| 2010 | 49° | 37° | 43° | 0.03" | — |
| 2009warmest | 86° | 66° | 76° | — | — |
| 2008coldest | 54° | 25° | 39° | — | — |
| 2007 | 62° | 43° | 52° | — | — |
| 2006 | 66° | 48° | 57° | — | — |
| 2005 | 77° | 45° | 61° | — | — |
| 2004 | 63° | 47° | 55° | — | — |
| 2003 | 54° | 45° | 49° | — | — |
| 2002 | 78° | 42° | 60° | — | — |
| 2001 | 62° | 37° | 50° | — | — |
| 2000 | 63° | 48° | 55° | — | — |
| 1999 | 64° | 45° | 54° | — | — |
| 1998 | 81° | 52° | 66° | — | — |
| 1997 | 72° | 55° | 63° | — | — |
| 1996 | 67° | 44° | 55° | — | — |
| 1995 | 67° | 40° | 53° | — | — |
| 1994 | 64° | 48° | 56° | — | — |
| 1993 | 65° | 50° | 57° | — | — |
| 1992 | 64° | 47° | 55° | — | — |
| 1991 | 64° | 49° | 56° | — | — |
| 1990 | 64° | 45° | 54° | — | — |
| 1989 | 69° | 43° | 56° | — | — |
| 1987 | 76° | 52° | 64° | — | — |
| 1986 | 82° | 56° | 69° | — | — |
| 1985 | 48° | 38° | 43° | 0.1" | — |
| 1984 | 63° | 47° | 55° | — | — |
| 1983 | 59° | 44° | 52° | 0.25" | — |
| 1982 | 75° | 51° | 63° | — | — |
| 1981 | 59° | 43° | 51° | — | — |
| 1980 | 57° | 36° | 46° | 0.18" | — |
| 1979 | 69° | 43° | 56° | — | — |
| 1978 | 52° | 35° | 43° | 0.03" | — |
| 1977 | 78° | 48° | 63° | — | — |
| 1976 | 78° | — | — | — | — |
| 1975 | 68° | 43° | 55° | — | — |
| 1974 | 68° | 37° | 53° | — | — |
| 1973 | 63° | 37° | 50° | — | — |
| 1972 | 72° | 38° | 55° | — | — |
| 1971 | 52° | 31° | 41° | 0.13" | — |
54 years of data from LIVERMORE CALIFORNIA