United States · 1991–2020

Best time to visit
San Marcos.

May leads for comfortable weather in San Marcos: typically 25.2°C by day, 13.1°C at night, with 9 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high25.2°C

Typical low13.1°C

Rain in May9 mm

Comfort

May

May · April · November

93climate match

Beach

July

July · September · August

84climate match

Outdoors

December

December · November · March

88climate match

The weakest month is February, scoring 66 against May’s 93 — nights drop to 7.4°C, and days reach only 20.7°C, 3° below 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

6720.6° / 6.8°

Feb

6620.7° / 7.4°

Mar

7822° / 9.1°

Apr

9224° / 10.7°

May

9325.2° / 13.1°

Jun

8728° / 15°

Jul

7330.9° / 17.5°

Aug

6832.1° / 18.2°

Sep

7430.7° / 17°

Oct

8727.2° / 13.5°

Nov

8823.7° / 8.9°

Dec

6920.4° / 6.3°

Monthly climate evidence for San Marcos — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 20 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	20.6°C	6.8°C	73 mm	5.4	15.2°C	10 h 11	67	Strong coverage
February	20.7°C	7.4°C	82 mm	6.2	15.2°C	10 h 57	66	Strong coverage
March	22°C	9.1°C	57 mm	4.9	15.5°C	11 h 53	78	Strong coverage
April	24°C	10.7°C	27 mm	3	16.2°C	12 h 57	92	Strong coverage
May	25.2°C	13.1°C	9 mm	1.7	17.5°C	13 h 51	93	Strong coverage
June	28°C	15°C	2 mm	0.4	18.9°C	14 h 20	87	Strong coverage
July	30.9°C	17.5°C	3 mm	0.6	20.7°C	14 h 08	73	Strong coverage
August	32.1°C	18.2°C	2 mm	0.2	21.4°C	13 h 22	68	Strong coverage
September	30.7°C	17°C	4 mm	0.7	21.0°C	12 h 20	74	Strong coverage
October	27.2°C	13.5°C	16 mm	1.7	19.6°C	11 h 18	87	Strong coverage
November	23.7°C	8.9°C	27 mm	3.1	17.7°C	10 h 24	88	Strong coverage
December	20.4°C	6.3°C	49 mm	5	16.0°C	9 h 58	69	Strong coverage

Records at ESCONDIDO #2, 1979–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	33.3°C31 Jan 2003	-3.9°C15 Jan 2007	82 mm29 Jan 1980	409 mm1993 · driest 0 mm in 2007	44
February	35.6°C27 Feb 2026	-2.8°C15 Feb 1990	80 mm14 Feb 2019	288 mm1998 · driest 0 mm in 2008	44
March	38.3°C20 Mar 2026	0.0°C29 Mar 2008	69 mm15 Mar 2023	225 mm1991 · driest 0 mm in 2008	44
April	39.4°C7 Apr 1989	-1.7°C1 Apr 2003	80 mm10 Apr 2020	134 mm2020 · driest 0 mm in 2007	43
May	40.0°C15 May 2014	1.7°C16 May 2003	21 mm7 May 2017	36 mm2019 · driest 0 mm in 1991	43
June	41.1°C20 Jun 2016	5.0°C21 Jun 2003	19 mm10 Jun 1990	25 mm1990 · driest 0 mm in 2018	44
July	44.4°C6 Jul 2018	10.0°C12 Jul 1984	19 mm1 Jul 1994	31 mm2015 · driest 0 mm in 2001	44
August	43.3°C23 Aug 2025	12.2°C29 Aug 1991	37 mm26 Aug 2007	70 mm2023 · driest 0 mm in 2020	41
September	46.1°C6 Sep 2020	9.4°C30 Sep 1982	44 mm25 Sep 1997	51 mm1997 · driest 0 mm in 1992	44
October	41.1°C1 Oct 2020	1.7°C10 Oct 1998	52 mm19 Oct 2010	115 mm2004 · driest 0 mm in 2007	43
November	36.7°C2 Nov 1997	-1.7°C21 Nov 1979	51 mm25 Nov 1985	163 mm1985 · driest 0 mm in 2006	44
December	32.2°C29 Dec 1980	-3.3°C23 Dec 1990	77 mm22 Dec 2010	225 mm2010 · driest 0 mm in 2017	45

Typical days per month at ESCONDIDO #2, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	6	<1	<1	3
February	5	1	<1	3
March	8	2	0	2
April	12	4	0	1
May	14	4	0	<1
June	23	9	0	0
July	28	17	0	<1
August	29	22	0	0
September	27	17	0	<1
October	21	9	0	<1
November	11	3	<1	<1
December	4	<1	<1	2

How often, not how much — every day in ESCONDIDO #2’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	53%	18%	8%	19%	18.0–23.0°C
February	53%	22%	9%	26%	18.8–24.0°C
March	61%	19%	7%	17%	19.5–24.9°C
April	79%	10%	3%	8%	21.8–26.3°C
May	89%	5%	<1%	<1%	22.3–27.3°C
June	98%	2%	<1%	0%	25.6–30.3°C
July	98%	2%	<1%	<1%	29.1–33.4°C
August	99%	1%	<1%	0%	29.3–33.7°C
September	97%	3%	<1%	<1%	28.3–32.8°C
October	92%	6%	2%	2%	24.5–29.5°C
November	78%	11%	4%	11%	20.9–25.8°C
December	54%	16%	5%	17%	18.5–23.0°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.

1980Each stripe is one year’s mean temperature against the 35-year average. Warmest: 2014. Coolest: 1982.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5392368
NOAA station: USC00042863 · ESCONDIDO #2
Station distance: 7.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 33.14°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 20 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 ESCONDIDO #2 is what differs

Escondido→Valley Center→Bellview Park Mobile Home Park→Canyon Crest Mobile Home Park→Carefree Ranch Mobile Home Park→Casa Grande Estates Mobile Home Park→

Or put two places side by side: San Marcos vs Escondido

Best time to visitSan Marcos.

May

July

December

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
San Marcos.

The whole year,
without the guesswork.

Nearby, measured,
and named.