All-time weather records — San Marino, CA

Record high
115.0°F
September 6, 2020
Record low
21.0°F
January 7, 1913
Wettest day
7.70 in
March 2, 1938

Climate change signal in San Marino

17.2%

of San Marino's all-time daily heat records were set in the last decade (63 of 366 records since 2015).

0%

of all-time daily cold records were set in the last decade (0 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 #
1890s
·
16
1900s
5
27
1910s
37
170
1920s
20
66
1930s
26
36
1940s
19
15
1950s
26
8
1960s
24
5
1970s
33
9
1980s
33
7
1990s
38
7
2000s
28
·
2010s
45
·
2020s
32
·

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 1909, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 93.0°F — Jan 18, 1971 21.0°F — Jan 7, 1913 7.08 in — Jan 22, 1943
February 96.1°F — Feb 27, 2026 26.1°F — Feb 9, 1929 6.25 in — Feb 24, 1913
March 99.0°F — Mar 17, 2026 23.0°F — Mar 2, 1978 7.70 in — Mar 2, 1938
April 105.1°F — Apr 6, 1989 30.9°F — Apr 18, 1917 3.81 in — Apr 5, 1926
May 104.0°F — May 15, 2014 32.0°F — May 1, 1915 1.82 in — May 9, 1977
June 113.0°F — Jun 17, 1917 41.0°F — Jun 1, 1916 1.58 in — Jun 16, 1995
July 113.0°F — Jul 7, 2018 45.0°F — Jul 7, 1894 0.45 in — Jul 1, 1918
August 109.0°F — Aug 18, 2020 43.0°F — Aug 28, 1912 3.41 in — Aug 21, 2023
September 115.0°F — Sep 6, 2020 41.0°F — Sep 27, 1911 4.90 in — Sep 25, 1939
October 108.0°F — Oct 11, 1991 36.0°F — Oct 20, 1920 5.14 in — Oct 20, 2004
November 100.9°F — Nov 4, 2010 26.1°F — Nov 28, 1919 5.55 in — Nov 29, 1970
December 93.0°F — Dec 3, 1958 25.0°F — Dec 27, 1916 6.17 in — Dec 31, 1933

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