All-time weather records — San Luis Obispo, CA

Record high
117.0°F
September 6, 2020
Record low
14.2°F
May 2, 2018
Wettest day
4.04 in
January 9, 2023

Climate change signal in San Luis Obispo

53.6%

of San Luis Obispo's all-time daily heat records were set in the last decade (196 of 366 records since 2015).

12.6%

of all-time daily cold records were set in the last decade (46 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 #
1990s
15
82
2000s
95
203
2010s
158
63
2020s
98
18

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 1998, the latest in 2026. Period of observation: 1998-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 91.0°F — Jan 15, 2021 21.2°F — Jan 14, 2007 4.04 in — Jan 9, 2023
February 89.1°F — Feb 8, 2018 27.0°F — Feb 1, 2002 2.65 in — Feb 13, 2025
March 97.0°F — Mar 17, 2026 30.9°F — Mar 4, 2002 2.93 in — Mar 14, 2023
April 100.9°F — Apr 20, 2009 30.0°F — Apr 4, 1999 2.05 in — Apr 17, 2000
May 102.9°F — May 15, 2014 14.2°F — May 2, 2018 1.58 in — May 21, 2006
June 113.0°F — Jun 20, 2008 32.0°F — Jun 17, 2000 0.25 in — Jun 4, 2011
July 102.0°F — Jul 6, 2018 44.1°F — Jul 4, 1999 1.32 in — Jul 19, 2015
August 111.0°F — Aug 29, 2009 45.0°F — Aug 15, 1999 0.04 in — Aug 15, 2008
September 117.0°F — Sep 6, 2020 32.0°F — Sep 30, 2000 0.54 in — Sep 19, 2022
October 108.0°F — Oct 24, 2017 33.1°F — Oct 31, 2019 3.68 in — Oct 13, 2009
November 96.1°F — Nov 5, 2012 28.0°F — Nov 13, 2000 2.06 in — Nov 4, 2004
December 88.0°F — Dec 1, 2021 21.9°F — Dec 22, 1998 3.63 in — Dec 19, 2010

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