United States · 1991–2020

Best time to visit
South Shore.

September leads for comfortable weather in South Shore: typically 26.9°C by day, 13.5°C at night, with 76 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.9°C

Typical low13.5°C

Rain in September76 mm

Comfort

September

September · May · June

79climate match

Beach

August

August · July · June

75climate match

Outdoors

October

October · April · May

81climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 5.1°C, 19° 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

55.1° / -4.8°

Feb

57.2° / -3.7°

Mar

2012.6° / 0.5°

Apr

5219.6° / 5.7°

May

7424.3° / 11.4°

Jun

6728.5° / 16.4°

Jul

5530.4° / 18.6°

Aug

6629.9° / 17.5°

Sep

7926.9° / 13.5°

Oct

6420.5° / 6.6°

Nov

3113.5° / 1°

Dec

57.5° / -2.3°

Monthly climate evidence for South Shore — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.1°C	-4.8°C	79 mm	8.9	9 h 44	5	Strong coverage
February	7.2°C	-3.7°C	75 mm	8	10 h 41	5	Strong coverage
March	12.6°C	0.5°C	105 mm	10.1	11 h 50	20	Strong coverage
April	19.6°C	5.7°C	104 mm	10.5	13 h 09	52	Strong coverage
May	24.3°C	11.4°C	117 mm	10.7	14 h 16	74	Strong coverage
June	28.5°C	16.4°C	105 mm	9.9	14 h 51	67	Strong coverage
July	30.4°C	18.6°C	117 mm	9.7	14 h 37	55	Strong coverage
August	29.9°C	17.5°C	81 mm	7.5	13 h 40	66	Strong coverage
September	26.9°C	13.5°C	76 mm	6.4	12 h 23	79	Strong coverage
October	20.5°C	6.6°C	73 mm	7.3	11 h 07	64	Strong coverage
November	13.5°C	1°C	70 mm	7.7	10 h 01	31	Strong coverage
December	7.5°C	-2.3°C	89 mm	8.6	9 h 28	5	Strong coverage

What has changed

South Shore runs +0.7°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

+0.5

Feb

+1.5

Mar

+0.4

Apr

+0.3

May

+0.1

Jun

+0.3

Jul

+0.6

Aug

+0.3

Sep

+1.0

Oct

+0.9

Nov

+0.2

Dec

+1.8

September daytime highs, 2011–2025. Last recorded: 29.0°C.

Records at PORTSMOUTH-SCIOTOVILLE, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.1°C25 Jan 1950	-33.9°C19 Jan 1994	64 mm8 Jan 1998	324 mm1937 · driest 17 mm in 1967	133
February	26.1°C15 Feb 1945	-27.8°C10 Feb 1899	86 mm24 Feb 1909	221 mm1897 · driest 4 mm in 1941	134
March	35.6°C23 Mar 1907	-17.8°C3 Mar 1980	95 mm2 Mar 1997	270 mm1997 · driest 10 mm in 1910	134
April	36.1°C30 Apr 1894	-10.0°C1 Apr 1923	112 mm15 Apr 1939	371 mm2011 · driest 11 mm in 1960	134
May	37.2°C29 May 1914	-2.2°C4 May 1986	79 mm3 May 2010	271 mm2001 · driest 7 mm in 1932	134
June	39.4°C29 Jun 1934	3.3°C10 Jun 1988	78 mm22 Jun 1909	228 mm1909 · driest 14 mm in 1988	134
July	41.7°C28 Jul 1930	4.4°C1 Jul 1988	128 mm2 Jul 1938	305 mm1938 · driest 18 mm in 1930	134
August	40.6°C6 Aug 1918	1.7°C30 Aug 1986	97 mm7 Aug 1947	194 mm1974 · driest 8 mm in 2025	132
September	39.4°C7 Sep 1954	-2.2°C25 Sep 1913	167 mm28 Sep 2024	321 mm2018 · driest 6 mm in 1908	132
October	34.4°C1 Oct 1953	-7.8°C30 Oct 1895	90 mm13 Oct 1893	184 mm1983 · driest 0 mm in 2000	133
November	29.4°C1 Nov 1935	-16.7°C25 Nov 1950	76 mm8 Nov 1897	190 mm1921 · driest 9 mm in 1904	133
December	24.4°C11 Dec 1971	-27.8°C23 Dec 1989	84 mm24 Dec 1921	251 mm1978 · driest 14 mm in 1965	132

Typical days per month at PORTSMOUTH-SCIOTOVILLE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	3	1
February	0	0	22	3	1
March	1	<1	15	4	<1
April	7	<1	5	4	<1
May	15	4	<1	4	0
June	25	12	0	3	0
July	30	18	0	4	0
August	29	16	0	3	0
September	21	8	0	3	0
October	8	<1	2	2	0
November	<1	0	14	3	<1
December	0	0	21	3	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 82); on 2011–2025 it is May (82). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in PORTSMOUTH-SCIOTOVILLE’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%	31%	10%	36%	1.9–9.5°C
February	2%	31%	9%	36%	3.2–10.8°C
March	13%	34%	12%	44%	9.8–17.3°C
April	33%	35%	11%	43%	17.2–22.2°C
May	56%	34%	12%	42%	22.1–27.9°C
June	67%	32%	12%	38%	26.9–31.4°C
July	69%	31%	12%	33%	29.1–33.1°C
August	74%	26%	10%	27%	28.4–32.0°C
September	73%	23%	8%	20%	24.9–29.6°C
October	47%	22%	7%	22%	18.3–23.5°C
November	14%	27%	9%	29%	10.7–16.4°C
December	1%	29%	10%	33%	3.9–10.3°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.

1894Each stripe is one year’s mean temperature against the 123-year average. Warmest: 1921. Coolest: 1981.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4309076
NOAA station: USC00336781 · PORTSMOUTH-SCIOTOVILLE
Station distance: 7.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 38.72°, 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 PORTSMOUTH-SCIOTOVILLE is what differs

Portsmouth→Wheelersburg→West Portsmouth→Lucasville→New Boston→Rosemount→

Or put two places side by side: South Shore vs Portsmouth

Best time to visitSouth Shore.

September

August

October

The whole year,without the guesswork.

South Shore runs +0.7°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
South Shore.

The whole year,
without the guesswork.

South Shore runs +0.7°C
on the 1961–1990 baseline.

Nearby, measured,
and named.