All-time weather records — Rancho Santa Margarita, CA

Record high
115.0°F
July 6, 2018
Record low
30.0°F
January 11, 2013
Wettest day
4.02 in
December 22, 2010

Climate change signal in Rancho Santa Margarita

44.8%

of Rancho Santa Margarita's all-time daily heat records were set in the last decade (164 of 366 records since 2015).

18.6%

of all-time daily cold records were set in the last decade (68 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 #
2000s
122
101
2010s
181
230
2020s
63
35

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 2003, the latest in 2026. Period of observation: 2003-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 90.0°F — Jan 15, 2021 30.0°F — Jan 11, 2013 3.18 in — Jan 10, 2005
February 93.0°F — Feb 16, 2016 32.0°F — Feb 28, 2018 3.40 in — Feb 14, 2019
March 96.1°F — Mar 8, 2004 30.9°F — Mar 8, 2023 1.86 in — Mar 30, 2024
April 102.9°F — Apr 20, 2009 36.0°F — Apr 9, 2011 1.75 in — Apr 6, 2020
May 106.0°F — May 3, 2004 43.0°F — May 12, 2010 1.10 in — May 4, 2023
June 109.9°F — Jun 20, 2016 45.0°F — Jun 1, 2011 0.22 in — Jun 4, 2025
July 115.0°F — Jul 6, 2018 50.0°F — Jul 4, 2018 0.82 in — Jul 19, 2015
August 107.1°F — Aug 18, 2020 50.0°F — Aug 5, 2011 2.42 in — Aug 20, 2023
September 113.0°F — Sep 27, 2010 42.1°F — Sep 20, 2006 1.70 in — Sep 15, 2015
October 105.1°F — Oct 3, 2014 45.0°F — Oct 15, 2018 3.30 in — Oct 20, 2004
November 100.9°F — Nov 4, 2010 37.9°F — Nov 3, 2008 2.14 in — Nov 9, 2022
December 88.0°F — Dec 10, 2017 30.0°F — Dec 16, 2011 4.02 in — Dec 22, 2010

Click a month to see every daily record for that month in Rancho Santa Margarita.