United States · 1991–2020

Best time to visit
Oak Harbor.

July leads for comfortable weather in Oak Harbor: typically 19.7°C by day, 11.5°C at night, with 16 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high19.7°C

Typical low11.5°C

Rain in July16 mm

Comfort

July

July · August · June

80climate match

Beach

August

August · July · June

46climate match

Outdoors

July

July · August · June

97climate match

The weakest month is December, scoring 14 against July’s 80 — days reach only 8.1°C, 16° 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

158.7° / 2.4°

Feb

239.7° / 2.1°

Mar

3111.6° / 3.8°

Apr

4313.6° / 5.7°

May

5615.9° / 8.2°

Jun

6917.8° / 10.2°

Jul

8019.7° / 11.5°

Aug

8020° / 11.5°

Sep

6918.2° / 9.5°

Oct

4414.5° / 6.6°

Nov

2310.9° / 4.2°

Dec

148.1° / 2.1°

Monthly climate evidence for Oak Harbor — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 19 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	8.7°C	2.4°C	60 mm	12.4	8.0°C	8 h 44	15	Strong coverage
February	9.7°C	2.1°C	44 mm	9.1	7.9°C	10 h 07	23	Strong coverage
March	11.6°C	3.8°C	43 mm	10.6	8.2°C	11 h 44	31	Strong coverage
April	13.6°C	5.7°C	43 mm	8.7	8.9°C	13 h 35	43	Strong coverage
May	15.9°C	8.2°C	40 mm	8	9.9°C	15 h 10	56	Strong coverage
June	17.8°C	10.2°C	28 mm	5.6	11.0°C	16 h 04	69	Strong coverage
July	19.7°C	11.5°C	16 mm	3	11.8°C	15 h 43	80	Strong coverage
August	20°C	11.5°C	23 mm	3.4	12.1°C	14 h 19	80	Strong coverage
September	18.2°C	9.5°C	26 mm	5.8	11.5°C	12 h 31	69	Strong coverage
October	14.5°C	6.6°C	54 mm	10.1	10.2°C	10 h 44	44	Strong coverage
November	10.9°C	4.2°C	74 mm	12.8	9.3°C	9 h 09	23	Strong coverage
December	8.1°C	2.1°C	56 mm	11.6	8.5°C	8 h 21	14	Strong coverage

What has changed

Oak Harbor runs +0.8°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

+1.4

Feb

-0.4

Mar

+0.8

Apr

+1.0

May

+0.8

Jun

+0.6

Jul

+0.6

Aug

+1.0

Sep

+0.4

Oct

+0.5

Nov

+1.6

Dec

+0.8

July daytime highs, 2011–2025. Last recorded: 17.6°C.

Records at WHIDBEY ISLAND NAS, 1945–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.3°C19 Jan 1981	-18.3°C25 Jan 1950	35 mm5 Jan 2015	155 mm1971 · driest 0 mm in 2001	72
February	21.1°C27 Feb 1986	-14.4°C4 Feb 1989	36 mm5 Feb 2020	101 mm2020 · driest 8 mm in 1993	73
March	24.4°C19 Mar 2019	-8.9°C4 Mar 1955	30 mm20 Mar 1984	92 mm1989 · driest 8 mm in 1965	74
April	25.6°C29 Apr 1976	-3.8°C4 Apr 2011	28 mm9 Apr 1983	83 mm1992 · driest 2 mm in 1956	75
May	27.8°C19 May 1961	0.0°C1 May 1954	47 mm28 May 2010	98 mm2010 · driest 5 mm in 1957	74
June	29.4°C9 Jun 1955	2.8°C19 Jun 1955	59 mm14 Jun 1946	119 mm1946 · driest 0 mm in 2009	74
July	31.1°C19 Jul 2015	4.4°C31 Jul 2009	26 mm5 Jul 1961	54 mm1966 · driest 0 mm in 1960	73
August	31.1°C8 Aug 1960	3.9°C29 Aug 1980	33 mm25 Aug 2004	118 mm2004 · driest 0 mm in 1974	73
September	31.1°C6 Sep 1986	-1.7°C27 Sep 1972	77 mm1 Sep 1983	107 mm1970 · driest 1 mm in 1991	73
October	24.4°C5 Oct 2005	-5.6°C28 Oct 1971	32 mm25 Oct 1945	147 mm1985 · driest 7 mm in 1987	72
November	22.2°C8 Nov 2016	-12.8°C15 Nov 1955	58 mm9 Nov 1990	225 mm1990 · driest 15 mm in 1952	72
December	17.2°C10 Dec 2014	-16.1°C29 Dec 1968	46 mm27 Dec 1949	165 mm1979 · driest 10 mm in 1945	72

Typical days per month at WHIDBEY ISLAND NAS, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	9	1	1
February	0	10	1	<1
March	0	5	<1	<1
April	<1	<1	1	0
May	<1	0	<1	0
June	<1	0	<1	0
July	1	0	<1	0
August	2	0	<1	0
September	<1	0	<1	0
October	0	1	1	<1
November	0	5	2	<1
December	0	9	1	<1

How often, not how much — every day in WHIDBEY ISLAND NAS’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	0%	40%	4%	52%	5.5–10.7°C
February	<1%	34%	3%	46%	7.3–11.1°C
March	<1%	33%	2%	40%	9.1–12.9°C
April	1%	28%	2%	32%	11.5–14.8°C
May	6%	23%	2%	24%	13.8–17.4°C
June	17%	20%	2%	18%	15.8–18.9°C
July	33%	11%	1%	7%	17.6–20.7°C
August	38%	11%	2%	9%	18.1–21.1°C
September	21%	19%	2%	18%	16.6–19.4°C
October	2%	30%	4%	40%	12.8–15.5°C
November	<1%	41%	5%	59%	8.8–12.2°C
December	0%	40%	4%	57%	5.6–9.5°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.

1946Each stripe is one year’s mean temperature against the 66-year average. Warmest: 2014. Coolest: 1955.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5805441
NOAA station: USW00024255 · WHIDBEY ISLAND NAS
Station distance: 6.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 48.29°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 19 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 WHIDBEY ISLAND NAS is what differs

Ault Field→Cornet→Dewey→Marketown→Rosario Beach→Swantown→

Or put two places side by side: Oak Harbor vs Ault Field

Best time to visitOak Harbor.

July

August

July

The whole year,without the guesswork.

Oak Harbor runs +0.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Oak Harbor.

The whole year,
without the guesswork.

Oak Harbor runs +0.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.