All-time weather records — San Ramon, CA

Record high
111.0°F
July 15, 1972
Record low
14.0°F
February 6, 1989
Wettest day
6.04 in
October 25, 2021

Climate change signal in San Ramon

4.9%

of San Ramon's all-time daily heat records were set in the last decade (18 of 366 records since 2015).

0.5%

of all-time daily cold records were set in the last decade (2 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1950s
44
51
1960s
71
38
1970s
91
53
1980s
59
42
1990s
28
42
2000s
49
124
2010s
14
15
2020s
10
1

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1952, the latest in 2025. Period of observation: 1952-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 77.0°F — Jan 13, 1983 18.0°F — Jan 22, 1962 5.02 in — Jan 21, 1967
February 80.1°F — Feb 18, 1977 14.0°F — Feb 6, 1989 4.73 in — Feb 1, 1963
March 84.0°F — Mar 17, 1972 23.0°F — Mar 26, 1991 2.72 in — Mar 10, 2023
April 96.1°F — Apr 22, 1987 23.0°F — Apr 20, 2008 2.50 in — Apr 7, 2018
May 102.0°F — May 6, 1987 30.9°F — May 1, 1988 1.65 in — May 16, 1996
June 107.1°F — Jun 16, 1961 34.0°F — Jun 6, 2000 1.15 in — Jun 5, 2011
July 111.0°F — Jul 15, 1972 34.0°F — Jul 5, 1955 0.55 in — Jul 9, 1974
August 107.1°F — Aug 7, 1966 39.9°F — Aug 31, 2000 0.61 in — Aug 19, 1976
September 107.1°F — Sep 3, 1955 35.1°F — Sep 20, 2007 2.01 in — Sep 19, 1959
October 100.0°F — Oct 3, 2024 30.0°F — Oct 19, 1990 6.04 in — Oct 25, 2021
November 90.0°F — Nov 2, 1966 26.1°F — Nov 13, 1985 3.60 in — Nov 6, 1994
December 78.1°F — Dec 19, 2007 14.0°F — Dec 22, 1990 4.85 in — Dec 23, 1955

Click a month to see every daily record for that month in San Ramon.