All-time weather records — La Mesa, CA

Record high
114.1°F
September 5, 2020
Record low
25.0°F
December 25, 1987
Wettest day
3.80 in
December 22, 2010

Climate change signal in La Mesa

22.7%

of La Mesa's all-time daily heat records were set in the last decade (83 of 366 records since 2015).

7.1%

of all-time daily cold records were set in the last decade (26 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 #
1970s
4
4
1980s
87
170
1990s
57
71
2000s
97
54
2010s
79
50
2020s
42
17

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 1979, the latest in 2026. Period of observation: 1979-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 93.0°F — Jan 15, 2021 26.1°F — Jan 14, 2007 2.75 in — Jan 22, 2024
February 95.0°F — Feb 22, 2002 28.0°F — Feb 15, 1990 2.52 in — Feb 21, 1980
March 98.1°F — Mar 19, 1997 30.0°F — Mar 16, 1988 2.11 in — Mar 5, 1995
April 104.0°F — Apr 6, 1989 30.9°F — Apr 5, 1991 1.88 in — Apr 10, 2020
May 104.0°F — May 3, 2004 30.9°F — May 12, 1999 0.90 in — May 7, 2017
June 107.1°F — Jun 20, 2016 46.0°F — Jun 5, 1999 0.47 in — Jun 10, 1990
July 113.0°F — Jul 22, 2006 50.0°F — Jul 2, 2004 1.90 in — Jul 31, 2006
August 107.1°F — Aug 13, 1994 50.0°F — Aug 6, 2000 1.20 in — Aug 20, 2023
September 114.1°F — Sep 5, 2020 48.9°F — Sep 12, 1985 0.75 in — Sep 25, 1986
October 106.0°F — Oct 10, 1991 30.0°F — Oct 22, 2011 1.90 in — Oct 10, 1986
November 99.0°F — Nov 7, 2008 28.9°F — Nov 21, 1979 2.40 in — Nov 25, 1985
December 93.0°F — Dec 4, 1979 25.0°F — Dec 25, 1987 3.80 in — Dec 22, 2010

Click a month to see every daily record for that month in La Mesa.