United States · 1991–2020

Best time to visit
San Diego.

October leads for comfortable weather in San Diego: typically 23.4°C by day, 16.3°C at night, with 13 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high23.4°C

Typical low16.3°C

Rain in October13 mm

Comfort

October

October · July · September

96climate match

Beach

August

August · September · July

84climate match

Outdoors

April

April · December · November

93climate match

The weakest month is January, scoring 70 against October’s 96 — days reach only 18.9°C, 5° 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

7018.9° / 10°

Feb

7018.7° / 10.8°

Mar

7719.2° / 12.3°

Apr

8520.2° / 13.7°

May

8820.6° / 15.5°

Jun

8921.7° / 16.9°

Jul

9223.8° / 18.8°

Aug

8925° / 19.5°

Sep

9024.9° / 18.8°

Oct

9623.4° / 16.3°

Nov

8621.2° / 12.5°

Dec

7118.6° / 9.7°

Monthly climate evidence for San Diego — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 11 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	18.9°C	10°C	50 mm	5.3	15.3°C	10 h 13	70	Strong coverage
February	18.7°C	10.8°C	56 mm	5.5	15.1°C	10 h 58	70	Strong coverage
March	19.2°C	12.3°C	37 mm	4.6	15.5°C	11 h 53	77	Strong coverage
April	20.2°C	13.7°C	17 mm	2.8	16.1°C	12 h 56	85	Strong coverage
May	20.6°C	15.5°C	7 mm	1.2	17.3°C	13 h 49	88	Strong coverage
June	21.7°C	16.9°C	1 mm	0.3	18.6°C	14 h 17	89	Strong coverage
July	23.8°C	18.8°C	2 mm	0.2	20.2°C	14 h 06	92	Strong coverage
August	25°C	19.5°C	0 mm	0.1	21.0°C	13 h 21	89	Strong coverage
September	24.9°C	18.8°C	3 mm	0.5	20.5°C	12 h 20	90	Strong coverage
October	23.4°C	16.3°C	13 mm	1.6	19.3°C	11 h 19	96	Strong coverage
November	21.2°C	12.5°C	20 mm	2.8	17.5°C	10 h 26	86	Strong coverage
December	18.6°C	9.7°C	42 mm	4.2	16.0°C	10 h 00	71	Strong coverage

What has changed

San Diego runs +0.4°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+0.6

Feb

+0.1

Mar

+0.5

Apr

+0.6

May

+0.2

Jun

-0.1

Jul

-0.1

Aug

+0.2

Sep

+0.8

Oct

+0.7

Nov

+0.9

Dec

+0.4

October daytime highs, 2011–2025. Last recorded: 23.0°C.

Records at SAN DIEGO INTL AP, 1939–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	31.1°C10 Jan 1953	-1.7°C4 Jan 1949	69 mm22 Jan 2024	231 mm1993 · driest 0 mm in 1948	87
February	32.8°C12 Feb 2022	2.2°C15 Feb 1949	59 mm27 Feb 2017	194 mm1998 · driest 0 mm in 1967	87
March	33.9°C17 Mar 1978	3.9°C2 Mar 1971	54 mm7 Mar 1952	177 mm1991 · driest 0 mm in 1956	87
April	36.7°C20 Apr 2009	5.0°C3 Apr 1945	36 mm20 Apr 1988	94 mm1988 · driest 0 mm in 2008	87
May	36.1°C15 May 2014	8.9°C1 May 1967	41 mm14 May 2015	61 mm2015 · driest 0 mm in 1959	87
June	38.3°C10 Jun 1979	10.0°C14 Jun 1943	12 mm10 Jun 1990	22 mm1990 · driest 0 mm in 2024	87
July	37.2°C22 Jul 2006	12.8°C5 Jul 1948	26 mm18 Jul 2015	44 mm2015 · driest 0 mm in 2011	88
August	36.7°C31 Aug 1955	13.9°C7 Aug 1944	46 mm20 Aug 2023	54 mm1977 · driest 0 mm in 1959	87
September	43.9°C26 Sep 1963	10.6°C26 Sep 1948	31 mm15 Sep 2015	80 mm1939 · driest 0 mm in 1953	87
October	41.7°C14 Oct 1961	6.1°C30 Oct 1971	69 mm27 Oct 2004	127 mm2004 · driest 0 mm in 1944	87
November	37.8°C4 Nov 2010	3.3°C15 Nov 1964	52 mm25 Nov 1985	148 mm1965 · driest 0 mm in 2021	87
December	31.1°C29 Dec 1963	1.1°C25 Dec 1987	66 mm22 Dec 1945	193 mm1943 · driest 0 mm in 2024	87

Typical days per month at SAN DIEGO INTL AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	2	0	2
February	2	<1	2
March	2	<1	1
April	3	<1	<1
May	2	<1	<1
June	3	<1	0
July	9	<1	<1
August	15	1	0
September	13	2	<1
October	8	2	<1
November	5	1	<1
December	1	0	1

How often, not how much — every day in SAN DIEGO INTL AP’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	32%	17%	5%	18%	17.0–20.8°C
February	30%	18%	5%	19%	17.2–20.9°C
March	32%	16%	5%	14%	17.6–20.9°C
April	46%	9%	2%	6%	18.5–21.7°C
May	63%	4%	<1%	1%	19.4–22.4°C
June	86%	1%	0%	<1%	20.7–23.4°C
July	99%	<1%	<1%	0%	22.9–25.7°C
August	99%	<1%	<1%	0%	23.7–26.4°C
September	97%	3%	<1%	<1%	23.4–27.3°C
October	91%	5%	1%	3%	21.9–25.5°C
November	62%	11%	3%	9%	19.6–23.2°C
December	34%	14%	4%	13%	17.2–21.2°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.

1940Each stripe is one year’s mean temperature against the 86-year average. Warmest: 2014. Coolest: 1948.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5391811
NOAA station: USW00023188 · SAN DIEGO INTL AP
Station distance: 2.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 32.72°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 11 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 SAN DIEGO INTL AP is what differs

Barrio Logan→Brooklyn Heights→East San Diego→Five Points→Golden Hill→Grant Hill→

Or put two places side by side: San Diego vs Barrio Logan

Best time to visitSan Diego.