United States · 1991–2020

Best time to visit
Port William.

September leads for comfortable weather in Port William: typically 25.3°C by day, 11.7°C at night, with 78 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.3°C

Typical low11.7°C

Rain in September78 mm

Comfort

September

September · August · June

80climate match

Beach

August

August · July · June

72climate match

Outdoors

October

October · September · May

76climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only 2.3°C, 22° 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

52.3° / -6.6°

Feb

54.2° / -5.4°

Mar

109.9° / -1°

Apr

4017.2° / 4.6°

May

6922.6° / 10.8°

Jun

7027.1° / 15.9°

Jul

6528.7° / 17.1°

Aug

7528.3° / 15.7°

Sep

8025.3° / 11.7°

Oct

5518.7° / 5.9°

Nov

2111.1° / 0.6°

Dec

54.7° / -3.5°

Monthly climate evidence for Port William — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.3°C	-6.6°C	80 mm	9.2	9 h 39	5	Strong coverage
February	4.2°C	-5.4°C	62 mm	7.8	10 h 39	5	Strong coverage
March	9.9°C	-1°C	93 mm	10.1	11 h 49	10	Strong coverage
April	17.2°C	4.6°C	112 mm	11.6	13 h 11	40	Strong coverage
May	22.6°C	10.8°C	119 mm	11.5	14 h 20	69	Strong coverage
June	27.1°C	15.9°C	117 mm	10.7	14 h 57	70	Strong coverage
July	28.7°C	17.1°C	109 mm	9.4	14 h 42	65	Strong coverage
August	28.3°C	15.7°C	76 mm	7.1	13 h 43	75	Strong coverage
September	25.3°C	11.7°C	78 mm	7.4	12 h 24	80	Strong coverage
October	18.7°C	5.9°C	80 mm	7.8	11 h 05	55	Strong coverage
November	11.1°C	0.6°C	76 mm	8.2	9 h 57	21	Strong coverage
December	4.7°C	-3.5°C	83 mm	8.6	9 h 23	5	Strong coverage

What has changed

Port William runs +0.5°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

+0.7

Feb

+0.8

Mar

-0.3

Apr

+0.7

May

+1.0

Jun

+0.2

Jul

-0.2

Aug

0.0

Sep

+0.5

Oct

+0.3

Nov

-0.3

Dec

+2.0

September daytime highs, 2011–2018. Last recorded: 26.7°C.

Records at WILMINGTON 3 N, 1917–2019
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.3°C25 Jan 1950	-31.7°C22 Jan 1984	87 mm22 Jan 1959	349 mm1937 · driest 6 mm in 1981	101
February	24.4°C21 Feb 2018	-28.9°C3 Feb 1985	57 mm2 Feb 1988	152 mm1962 · driest 11 mm in 1978	101
March	31.1°C25 Mar 1929	-23.3°C10 Mar 1984	92 mm5 Mar 1964	328 mm1964 · driest 25 mm in 1928	101
April	33.3°C30 Apr 1942	-12.2°C1 Apr 1923	99 mm20 Apr 1940	240 mm2011 · driest 23 mm in 1971	101
May	36.1°C10 May 1936	-4.4°C10 May 1966	111 mm24 May 1968	329 mm1968 · driest 14 mm in 1934	102
June	40.0°C28 Jun 1944	2.2°C4 Jun 1929	88 mm21 Jun 1939	278 mm1939 · driest 10 mm in 1988	102
July	43.9°C21 Jul 1934	4.4°C1 Jul 1988	136 mm21 Jul 1954	291 mm1938 · driest 17 mm in 1972	100
August	40.6°C4 Aug 1930	2.8°C30 Aug 1946	86 mm31 Aug 2005	269 mm1926 · driest 18 mm in 2012	100
September	40.0°C14 Sep 1939	-3.3°C26 Sep 1928	103 mm14 Sep 1979	208 mm1965 · driest 14 mm in 1953	100
October	33.3°C1 Oct 1927	-11.1°C29 Oct 1925	72 mm23 Oct 2007	256 mm1919 · driest 1 mm in 1963	100
November	27.8°C3 Nov 1946	-21.1°C30 Nov 1958	82 mm6 Nov 2017	242 mm1985 · driest 13 mm in 1976	101
December	22.8°C4 Dec 1982	-31.1°C22 Dec 1989	62 mm24 Dec 1921	266 mm1923 · driest 15 mm in 1976	101

Typical days per month at WILMINGTON 3 N, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	3	7
February	0	0	23	2	6
March	<1	0	19	3	3
April	3	0	6	4	<1
May	12	2	<1	4	0
June	22	8	0	4	0
July	28	12	0	4	0
August	27	10	0	2	0
September	17	5	0	3	0
October	5	<1	4	3	<1
November	<1	0	16	3	2
December	0	0	23	3	5

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 84); on 2011–2025 it is May (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in WILMINGTON 3 N’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	<1%	32%	9%	40%	-1.1–6.7°C
February	<1%	30%	8%	39%	0.8–8.2°C
March	9%	34%	11%	47%	6.8–13.6°C
April	25%	37%	13%	50%	14.6–20.1°C
May	50%	35%	13%	47%	20.3–26.2°C
June	66%	33%	12%	42%	25.7–30.5°C
July	71%	29%	12%	34%	27.7–32.0°C
August	75%	25%	9%	25%	26.8–31.3°C
September	69%	24%	9%	25%	23.3–28.3°C
October	39%	25%	8%	28%	16.4–22.1°C
November	8%	30%	9%	35%	8.2–13.9°C
December	<1%	31%	9%	39%	1.3–8.0°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.

1918Each stripe is one year’s mean temperature against the 95-year average. Warmest: 1921. Coolest: 1976.2018

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4521782
NOAA station: USC00339219 · WILMINGTON 3 N
Station distance: 7.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 39.55°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 WILMINGTON 3 N is what differs

Sabina→Bowersville→Bloomington→Clinton→Edgefield→Gunnerville→

Or put two places side by side: Port William vs Sabina

Best time to visitPort William.