United States · 1991–2020

Best time to visit
Cohasset.

September leads for comfortable weather in Cohasset: typically 23.2°C by day, 12.9°C at night, with 98 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.2°C

Typical low12.9°C

Rain in September98 mm

Comfort

September

September · June · August

81climate match

Beach

July

July · August · June

73climate match

Outdoors

May

May · September · October

78climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only 3.2°C, 21° 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

53.2° / -5.8°

Feb

54.6° / -5.1°

Mar

58.3° / -1.6°

Apr

3114.6° / 3.5°

May

6120.2° / 8.8°

Jun

8025.1° / 14°

Jul

6928.3° / 17.4°

Aug

7327.4° / 16.7°

Sep

8123.2° / 12.9°

Oct

4217.1° / 6.8°

Nov

1811.3° / 1.8°

Dec

56° / -2.6°

Monthly climate evidence for Cohasset — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 16 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	3.2°C	-5.8°C	114 mm	9.9	4.9°C	9 h 24	5	Strong coverage
February	4.6°C	-5.1°C	101 mm	8.8	3.3°C	10 h 30	5	Strong coverage
March	8.3°C	-1.6°C	137 mm	9.5	3.5°C	11 h 48	5	Strong coverage
April	14.6°C	3.5°C	118 mm	9.4	5.8°C	13 h 18	31	Strong coverage
May	20.2°C	8.8°C	96 mm	10	10.1°C	14 h 33	61	Strong coverage
June	25.1°C	14°C	103 mm	8.8	14.7°C	15 h 15	80	Strong coverage
July	28.3°C	17.4°C	90 mm	8	18.2°C	14 h 59	69	Strong coverage
August	27.4°C	16.7°C	95 mm	7.3	18.8°C	13 h 53	73	Strong coverage
September	23.2°C	12.9°C	98 mm	7.5	17.0°C	12 h 26	81	Strong coverage
October	17.1°C	6.8°C	137 mm	9.5	13.5°C	10 h 59	42	Strong coverage
November	11.3°C	1.8°C	113 mm	9	10.2°C	9 h 44	18	Strong coverage
December	6°C	-2.6°C	129 mm	10	7.5°C	9 h 06	5	Strong coverage

What has changed

Cohasset runs +1.4°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

+1.4

Feb

+1.9

Mar

+1.2

Apr

+1.1

May

+1.1

Jun

+0.8

Jul

+1.7

Aug

+1.8

Sep

+1.8

Oct

+1.0

Nov

+0.7

Dec

+2.2

September daytime highs, 2011–2025. Last recorded: 23.2°C.

Records at HINGHAM, 1960–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C12 Jan 2020	-25.0°C22 Jan 1961	66 mm25 Jan 1979	297 mm1979 · driest 23 mm in 1989	65
February	22.8°C24 Feb 2017	-23.3°C14 Feb 2016	90 mm24 Feb 1998	220 mm2008 · driest 16 mm in 1987	66
March	31.7°C31 Mar 1998	-17.8°C10 Mar 1996	148 mm18 Mar 1968	445 mm2010 · driest 10 mm in 2006	66
April	35.0°C17 Apr 2002	-9.4°C1 Apr 1964	107 mm21 Apr 1991	276 mm1987 · driest 23 mm in 1999	66
May	36.1°C18 May 2017	-2.8°C2 May 1964	120 mm31 May 1984	353 mm2006 · driest 17 mm in 1964	66
June	37.8°C10 Jun 2008	1.7°C6 Jun 1964	112 mm7 Jun 2006	371 mm2006 · driest 1 mm in 1999	66
July	38.3°C24 Jul 2022	5.6°C7 Jul 1965	88 mm13 Jul 1996	313 mm2021 · driest 5 mm in 2025	66
August	37.8°C7 Aug 2022	1.1°C31 Aug 1965	146 mm14 Aug 2005	265 mm2005 · driest 9 mm in 2017	65
September	36.1°C8 Sep 2015	-1.7°C22 Sep 1962	119 mm3 Sep 1972	221 mm1972 · driest 13 mm in 1980	66
October	31.1°C5 Oct 2007	-7.8°C31 Oct 1966	140 mm20 Oct 1996	362 mm2005 · driest 17 mm in 2024	65
November	27.2°C6 Nov 2024	-16.7°C24 Nov 1989	92 mm25 Nov 1983	285 mm2018 · driest 20 mm in 1976	66
December	25.0°C7 Dec 1998	-22.2°C26 Dec 1980	88 mm12 Dec 1992	259 mm1969 · driest 25 mm in 1989	65

Typical days per month at HINGHAM, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	4	8
February	0	0	24	4	7
March	<1	<1	20	4	5
April	2	<1	7	4	<1
May	7	2	<1	3	0
June	17	5	0	3	0
July	25	12	0	3	0
August	23	9	0	3	0
September	11	2	0	3	0
October	2	<1	2	4	<1
November	<1	0	13	4	<1
December	0	0	23	5	5

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 88); on 2011–2025 it is September (89). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in HINGHAM’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%	31%	12%	37%	-0.3–5.5°C
February	<1%	30%	12%	37%	1.3–7.3°C
March	3%	31%	12%	37%	6.0–10.8°C
April	14%	31%	12%	38%	12.1–16.6°C
May	42%	31%	10%	36%	18.2–22.5°C
June	65%	29%	9%	32%	23.3–26.7°C
July	74%	25%	10%	23%	26.1–29.8°C
August	74%	25%	10%	24%	25.5–28.7°C
September	57%	24%	10%	28%	21.1–24.3°C
October	23%	27%	11%	30%	15.3–19.1°C
November	5%	30%	12%	37%	9.1–14.0°C
December	<1%	32%	13%	43%	2.7–8.4°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.

1961Each stripe is one year’s mean temperature against the 62-year average. Warmest: 2023. Coolest: 1962.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4933533
NOAA station: USC00193624 · HINGHAM
Station distance: 9.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 42.24°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 16 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 HINGHAM is what differs

Quincy→Weymouth→Braintree→Rockland→Hanover→Norwell→

Or put two places side by side: Cohasset vs Quincy

Best time to visitCohasset.

September

July

May

The whole year,without the guesswork.

Cohasset runs +1.4°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Cohasset.

The whole year,
without the guesswork.

Cohasset runs +1.4°C
on the 1961–1990 baseline.

Nearby, measured,
and named.