United States · 1991–2020

Best time to visit
Oceanside.

September leads for comfortable weather in Oceanside: typically 22°C by day, 17°C at night, with 4 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high22°C

Typical low17°C

Rain in September4 mm

Comfort

September

September · October · August

90climate match

Beach

August

August · July · September

71climate match

Outdoors

November

November · April · October

98climate match

The weakest month is February, scoring 59 against September’s 90 — days reach only 16.8°C, 7° 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

6017.2° / 7.9°

Feb

5916.8° / 8.3°

Mar

6616.9° / 9.9°

Apr

7317.7° / 11.3°

May

7918.4° / 13.9°

Jun

8319.3° / 15.7°

Jul

8621.2° / 17.8°

Aug

8822° / 18.1°

Sep

9022° / 17°

Oct

8921.1° / 14.1°

Nov

7719.6° / 10.2°

Dec

6417.5° / 7.7°

Monthly climate evidence for Oceanside — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 8 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	17.2°C	7.9°C	57 mm	5.3	15.2°C	10 h 11	60	Strong coverage
February	16.8°C	8.3°C	61 mm	5.3	15.2°C	10 h 57	59	Strong coverage
March	16.9°C	9.9°C	34 mm	4.1	15.5°C	11 h 53	66	Strong coverage
April	17.7°C	11.3°C	20 mm	2.1	16.2°C	12 h 57	73	Strong coverage
May	18.4°C	13.9°C	7 mm	1.2	17.5°C	13 h 51	79	Strong coverage
June	19.3°C	15.7°C	2 mm	0.4	18.9°C	14 h 20	83	Strong coverage
July	21.2°C	17.8°C	1 mm	0.3	20.7°C	14 h 09	86	Strong coverage
August	22°C	18.1°C	1 mm	0.1	21.4°C	13 h 23	88	Strong coverage
September	22°C	17°C	4 mm	0.5	21.0°C	12 h 20	90	Strong coverage
October	21.1°C	14.1°C	15 mm	1.9	19.6°C	11 h 18	89	Strong coverage
November	19.6°C	10.2°C	19 mm	2.6	17.7°C	10 h 24	77	Strong coverage
December	17.5°C	7.7°C	40 mm	4	16.0°C	9 h 58	64	Strong coverage

What has changed

Oceanside runs -1.3°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

-0.9

Feb

-1.5

Mar

-1.5

Apr

-1.2

May

-1.3

Jun

-1.4

Jul

-1.5

Aug

-1.7

Sep

-1.3

Oct

-1.3

Nov

-0.8

Dec

-1.0

September daytime highs, 2011–2025. Last recorded: 22.3°C.

Records at OCEANSIDE MARINA, 1910–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	30.6°C19 Jan 2005	-6.7°C14 Jan 1963	67 mm9 Jan 2018	277 mm1916 · driest 0 mm in 1976	86
February	32.2°C12 Feb 1977	-2.2°C8 Feb 1974	68 mm22 Feb 2008	216 mm1998 · driest 0 mm in 1967	86
March	32.2°C18 Mar 1978	0.6°C4 Mar 1951	107 mm15 Mar 2023	224 mm2023 · driest 0 mm in 1997	84
April	37.2°C30 Apr 2014	0.6°C5 Apr 1975	78 mm10 Apr 2020	130 mm2020 · driest 0 mm in 2018	85
May	35.0°C13 May 2014	3.3°C18 May 1974	22 mm28 May 1990	35 mm2015 · driest 0 mm in 1985	86
June	33.9°C17 Jun 1957	6.1°C15 Jun 1975	15 mm5 Jun 1993	29 mm1993 · driest 0 mm in 2005	82
July	32.2°C4 Jul 1985	7.8°C20 Jul 1975	11 mm18 Jul 2015	22 mm2015 · driest 0 mm in 2005	83
August	34.4°C6 Aug 1983	8.3°C9 Aug 1975	56 mm17 Aug 1977	71 mm1977 · driest 0 mm in 2001	86
September	42.2°C26 Sep 1963	6.1°C28 Sep 1973	27 mm15 Sep 2015	79 mm1963 · driest 0 mm in 1968	83
October	40.6°C22 Oct 1965	2.2°C30 Oct 1971	49 mm27 Oct 2004	129 mm2004 · driest 0 mm in 1999	83
November	37.8°C4 Nov 1976	-1.7°C18 Nov 1961	54 mm15 Nov 2025	159 mm1965 · driest 0 mm in 1980	83
December	32.2°C29 Dec 1963	-2.8°C21 Dec 1968	70 mm22 Dec 1945	183 mm2010 · driest 0 mm in 2000	85

Typical days per month at OCEANSIDE MARINA, 1991–2020
Month	Days 25°C+	Heavy rain (10 mm+)
January	1	2
February	<1	2
March	<1	1
April	<1	<1
May	<1	<1
June	<1	<1
July	1	0
August	2	0
September	3	<1
October	3	<1
November	2	<1
December	<1	1

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 98); on 2011–2025 it is October (92). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in OCEANSIDE MARINA’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	19%	17%	6%	17%	16.0–19.2°C
February	17%	18%	7%	20%	15.3–19.7°C
March	15%	15%	5%	13%	15.5–19.5°C
April	21%	9%	3%	5%	16.5–20.0°C
May	28%	4%	<1%	2%	17.2–21.0°C
June	52%	2%	<1%	0%	18.3–22.3°C
July	91%	<1%	0%	<1%	20.4–24.5°C
August	96%	<1%	<1%	<1%	20.9–25.6°C
September	90%	2%	<1%	1%	20.5–25.1°C
October	71%	5%	1%	2%	19.3–23.8°C
November	41%	10%	3%	8%	18.2–21.7°C
December	21%	14%	5%	13%	16.1–19.7°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.

1915Each stripe is one year’s mean temperature against the 69-year average. Warmest: 2015. Coolest: 1948.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5378771
NOAA station: USC00046377 · OCEANSIDE MARINA
Station distance: 2.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 33.20°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 8 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 OCEANSIDE MARINA is what differs

Camp Pendleton South→Escondido Junction→Fallbrook Junction→Stuart→Yaldora→

Or put two places side by side: Oceanside vs Camp Pendleton South

Best time to visitOceanside.

September

August

November

The whole year,without the guesswork.

Oceanside runs -1.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Oceanside.

The whole year,
without the guesswork.

Oceanside runs -1.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.