United States · 1991–2020

Best time to visit
Rancho Santa Margarita.

November leads for comfortable weather in Rancho Santa Margarita: typically 24.5°C by day, 10.7°C at night, with 22 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortNovember

Typical high24.5°C

Typical low10.7°C

Rain in November22 mm

Comfort

November

November · May · March

91climate match

Beach

July

July · June · October

79climate match

Outdoors

December

December · January · March

89climate match

The weakest month is August, scoring 70 against November’s 91 — days average 32.3°C, 8° above the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

7521.3° / 8.5°

Feb

7421.6° / 8°

Mar

8823.7° / 9.1°

Apr

8825° / 10°

May

8926° / 12.3°

Jun

8428.3° / 14.1°

Jul

7331.6° / 16.2°

Aug

7032.3° / 16.4°

Sep

7331.7° / 15.7°

Oct

8328.6° / 13.8°

Nov

9124.5° / 10.7°

Dec

7020.3° / 8.3°

Monthly climate evidence for Rancho Santa Margarita — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 25 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	21.3°C	8.5°C	61 mm	4	15.1°C	10 h 09	75	Good coverage
February	21.6°C	8°C	65 mm	4.1	15.0°C	10 h 56	74	Good coverage
March	23.7°C	9.1°C	26 mm	3	15.2°C	11 h 52	88	Good coverage
April	25°C	10°C	21 mm	2.2	15.7°C	12 h 58	88	Good coverage
May	26°C	12.3°C	10 mm	1.6	17.0°C	13 h 53	89	Good coverage
June	28.3°C	14.1°C	1 mm	0.3	18.5°C	14 h 22	84	Good coverage
July	31.6°C	16.2°C	2 mm	0.3	20.2°C	14 h 11	73	Good coverage
August	32.3°C	16.4°C	0 mm	0.1	20.7°C	13 h 24	70	Good coverage
September	31.7°C	15.7°C	4 mm	0.4	20.5°C	12 h 20	73	Good coverage
October	28.6°C	13.8°C	21 mm	1.8	19.3°C	11 h 17	83	Good coverage
November	24.5°C	10.7°C	22 mm	2.2	17.6°C	10 h 22	91	Good coverage
December	20.3°C	8.3°C	66 mm	4.2	15.8°C	9 h 56	70	Good coverage

Records at IRVINE RCH, 2003–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	32.2°C15 Jan 2021	-1.1°C11 Jan 2013	81 mm10 Jan 2005	187 mm2005 · driest 0 mm in 2022	22
February	33.9°C16 Feb 2016	0.0°C28 Feb 2018	86 mm14 Feb 2019	239 mm2005 · driest 0 mm in 2016	23
March	36.7°C17 Mar 2026	-0.6°C8 Mar 2023	47 mm30 Mar 2024	167 mm2023 · driest 0 mm in 2008	22
April	39.4°C27 Apr 2004	2.2°C9 Apr 2011	45 mm6 Apr 2020	116 mm2020 · driest 0 mm in 2022	23
May	41.1°C3 May 2004	6.1°C12 May 2010	28 mm4 May 2023	40 mm2023 · driest 0 mm in 2004	23
June	43.3°C20 Jun 2016	7.2°C1 Jun 2011	6 mm4 Jun 2025	9 mm2023 · driest 0 mm in 2013	21
July	46.1°C7 Jul 2018	10.0°C4 Jul 2018	21 mm19 Jul 2015	28 mm2015 · driest 0 mm in 2017	21
August	41.7°C18 Aug 2020	10.0°C5 Aug 2011	62 mm20 Aug 2023	62 mm2023 · driest 0 mm in 2025	23
September	45.0°C27 Sep 2010	5.6°C20 Sep 2006	43 mm15 Sep 2015	48 mm2015 · driest 0 mm in 2004	23
October	40.6°C9 Oct 2015	7.2°C28 Oct 2009	84 mm20 Oct 2004	165 mm2004 · driest 0 mm in 2006	21
November	38.3°C4 Nov 2010	3.3°C30 Nov 2004	54 mm9 Nov 2022	97 mm2025 · driest 0 mm in 2009	23
December	31.1°C10 Dec 2017	-1.1°C16 Dec 2011	102 mm22 Dec 2010	324 mm2010 · driest 0 mm in 2024	21

Typical days per month at IRVINE RCH, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	7	1	2
February	7	2	2
March	12	3	1
April	15	4	<1
May	18	5	<1
June	26	8	0
July	31	22	<1
August	31	25	0
September	29	20	<1
October	24	12	<1
November	13	4	<1
December	4	<1	2

How often, not how much — every day in IRVINE RCH’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	59%	13%	7%	12%	19.2–23.4°C
February	61%	15%	7%	14%	19.1–23.8°C
March	73%	13%	5%	10%	20.4–25.8°C
April	86%	7%	2%	2%	21.9–26.3°C
May	91%	5%	1%	1%	23.1–28.2°C
June	98%	1%	0%	<1%	26.9–29.6°C
July	99%	<1%	<1%	0%	29.4–32.7°C
August	100%	<1%	<1%	0%	31.2–33.3°C
September	98%	2%	<1%	<1%	29.7–33.2°C
October	93%	6%	1%	3%	25.7–30.7°C
November	85%	7%	2%	2%	22.6–26.0°C
December	54%	13%	6%	11%	18.5–22.9°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5386082
NOAA station: USC00044303 · IRVINE RCH
Station distance: 14.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 33.64°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 25 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from IRVINE RCH is what differs

Coto De Caza→Foothill Ranch→Portola Hills→Trabuco Canyon→Carbondale (historical)→Cowan Heights→

Or put two places side by side: Rancho Santa Margarita vs Coto De Caza

Best time to visitRancho Santa Margarita.