United States · 1991–2020

Best time to visit
Nantucket.

July leads for comfortable weather in Nantucket: typically 24.2°C by day, 17.1°C at night, with 58 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high24.2°C

Typical low17.1°C

Rain in July58 mm

Comfort

July

July · August · September

90climate match

Beach

July

July · August · September

68climate match

Outdoors

June

June · September · May

81climate match

The weakest month is January, scoring 5 against July’s 90 — days reach only 4.2°C, 20° 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

54.2° / -2.8°

Feb

54.6° / -2.6°

Mar

57° / -0.2°

Apr

2511.4° / 3.9°

May

5116.1° / 8.5°

Jun

7520.4° / 13.2°

Jul

9024.2° / 17.1°

Aug

8724.4° / 17.2°

Sep

8021.7° / 14.1°

Oct

4916.6° / 9.4°

Nov

2811.9° / 4.7°

Dec

57.5° / 0.2°

Monthly climate evidence for Nantucket — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 10 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	4.2°C	-2.8°C	78 mm	8.5	4.7°C	9 h 30	5	Good coverage
February	4.6°C	-2.6°C	71 mm	7.4	3.3°C	10 h 33	5	Good coverage
March	7°C	-0.2°C	97 mm	7.7	3.7°C	11 h 48	5	Good coverage
April	11.4°C	3.9°C	90 mm	9.2	6.3°C	13 h 15	25	Good coverage
May	16.1°C	8.5°C	80 mm	8	10.0°C	14 h 28	51	Good coverage
June	20.4°C	13.2°C	75 mm	7.7	14.6°C	15 h 08	75	Good coverage
July	24.2°C	17.1°C	58 mm	5.3	18.9°C	14 h 52	90	Good coverage
August	24.4°C	17.2°C	72 mm	6.2	19.9°C	13 h 49	87	Good coverage
September	21.7°C	14.1°C	90 mm	6.1	18.4°C	12 h 25	80	Good coverage
October	16.6°C	9.4°C	113 mm	8.9	15.0°C	11 h 01	49	Good coverage
November	11.9°C	4.7°C	95 mm	8.4	10.7°C	9 h 48	28	Good coverage
December	7.5°C	0.2°C	98 mm	9.6	7.3°C	9 h 13	5	Good coverage

What has changed

Nantucket 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

+1.9

Feb

+2.2

Mar

+1.2

Apr

+1.4

May

+1.0

Jun

+0.8

Jul

+1.1

Aug

+1.0

Sep

+1.2

Oct

+1.5

Nov

+1.3

Dec

+2.1

July daytime highs, 2011–2025. Last recorded: 24.9°C.

Records at NANTUCKET MEM AP, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.2°C24 Jan 1967	-19.4°C16 Jan 2004	69 mm9 Jan 1953	209 mm1953 · driest 2 mm in 2025	64
February	16.1°C16 Feb 2023	-19.3°C4 Feb 2023	56 mm8 Feb 1953	205 mm1952 · driest 15 mm in 2006	64
March	18.9°C23 Mar 2012	-13.9°C4 Mar 1950	139 mm2 Mar 2018	278 mm2018 · driest 17 mm in 2006	63
April	28.3°C26 Apr 2009	-6.7°C7 Apr 1982	81 mm7 Apr 1953	214 mm1953 · driest 2 mm in 2026	64
May	29.4°C25 May 2007	-2.2°C27 May 1972	165 mm25 May 1967	264 mm1967 · driest 0 mm in 1973	64
June	33.3°C21 Jun 2012	1.7°C3 Jun 1976	77 mm7 Jun 2006	201 mm2006 · driest 0 mm in 1973	64
July	33.3°C1 Jul 1964	8.3°C8 Jul 1972	111 mm4 Jul 1978	189 mm1958 · driest 0 mm in 1973	64
August	37.8°C2 Aug 1975	3.9°C31 Aug 1965	91 mm29 Aug 2009	171 mm1967 · driest 0 mm in 2019	63
September	30.0°C11 Sep 2022	1.1°C22 Sep 1973	127 mm3 Sep 1972	282 mm2017 · driest 2 mm in 1971	63
October	28.3°C9 Oct 2011	-5.6°C31 Oct 1966	95 mm9 Oct 2016	214 mm2019 · driest 6 mm in 2024	61
November	23.3°C2 Nov 1971	-8.9°C25 Nov 2000	125 mm3 Nov 1966	209 mm2014 · driest 16 mm in 2001	62
December	18.9°C25 Dec 2015	-19.4°C31 Dec 1962	108 mm26 Dec 1969	248 mm1969 · driest 27 mm in 1998	62

Typical days per month at NANTUCKET MEM AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	22	2
February	0	0	21	3
March	0	0	16	3
April	<1	0	4	3
May	<1	0	<1	3
June	3	<1	0	2
July	12	<1	0	2
August	13	<1	0	3
September	3	<1	0	3
October	<1	0	<1	4
November	0	0	5	3
December	0	0	16	3

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 94); on 2011–2025 it is August (91). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in NANTUCKET MEM AP’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%	30%	10%	36%	1.3–6.4°C
February	0%	28%	10%	30%	1.4–6.6°C
March	0%	27%	10%	29%	4.9–8.9°C
April	1%	29%	10%	34%	9.3–12.3°C
May	11%	25%	8%	25%	14.3–17.1°C
June	50%	21%	6%	20%	18.6–22.1°C
July	80%	18%	6%	15%	22.6–25.5°C
August	78%	21%	8%	17%	22.7–25.6°C
September	57%	20%	9%	19%	19.6–22.5°C
October	13%	25%	10%	26%	15.2–17.6°C
November	<1%	29%	11%	35%	9.7–13.1°C
December	0%	32%	11%	40%	4.5–9.0°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.

1948Each stripe is one year’s mean temperature against the 60-year average. Warmest: 2022. Coolest: 1967.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4944903
NOAA station: USW00014756 · NANTUCKET MEM AP
Station distance: 4.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 41.28°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 10 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 NANTUCKET MEM AP is what differs

Madaket→Siasconset→Cisco→Codfish Park→Coskata→Fishers Landing→

Or put two places side by side: Nantucket vs Madaket

Best time to visitNantucket.

July

July

June

The whole year,without the guesswork.

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

Nearby, measured,and named.

Best time to visit
Nantucket.

The whole year,
without the guesswork.

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

Nearby, measured,
and named.