United States · 1991–2020

Best time to visit
Mastic.

September leads for comfortable weather in Mastic: typically 24°C by day, 14°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24°C

Typical low14°C

Rain in September83 mm

Comfort

September

September · June · August

88climate match

Beach

July

July · August · June

79climate match

Outdoors

May

May · October · September

83climate match

The weakest month is January, scoring 5 against September’s 88 — days reach only 3.9°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

53.9° / -4.8°

Feb

55.1° / -4.2°

Mar

68.9° / -0.5°

Apr

3414.5° / 4.4°

May

6419.8° / 9.8°

Jun

8324.8° / 15.3°

Jul

7028.1° / 18.8°

Aug

7327.6° / 18.2°

Sep

8824° / 14°

Oct

5318.1° / 8.1°

Nov

2912.5° / 2.7°

Dec

57.2° / -1.5°

Monthly climate evidence for Mastic — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 20 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	3.9°C	-4.8°C	74 mm	7.9	6.5°C	9 h 33	5	Good coverage
February	5.1°C	-4.2°C	82 mm	8	4.6°C	10 h 35	5	Good coverage
March	8.9°C	-0.5°C	114 mm	8.7	4.8°C	11 h 49	6	Good coverage
April	14.5°C	4.4°C	106 mm	9.3	7.3°C	13 h 14	34	Good coverage
May	19.8°C	9.8°C	88 mm	9.4	11.9°C	14 h 26	64	Good coverage
June	24.8°C	15.3°C	101 mm	7.7	17.5°C	15 h 05	83	Good coverage
July	28.1°C	18.8°C	82 mm	6.7	21.8°C	14 h 50	70	Good coverage
August	27.6°C	18.2°C	78 mm	6.9	22.6°C	13 h 48	73	Good coverage
September	24°C	14°C	83 mm	6.4	20.8°C	12 h 25	88	Good coverage
October	18.1°C	8.1°C	112 mm	7.6	17.1°C	11 h 03	53	Good coverage
November	12.5°C	2.7°C	86 mm	7.5	13.1°C	9 h 51	29	Good coverage
December	7.2°C	-1.5°C	113 mm	9.6	9.6°C	9 h 16	5	Good coverage

Records at SHIRLEY BROOKHAVEN AP, 1999–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.6°C12 Jan 2020	-20.5°C17 Jan 2009	47 mm8 Jan 2007	161 mm2024 · driest 18 mm in 2025	27
February	21.7°C16 Feb 2023	-18.8°C24 Feb 2015	75 mm8 Feb 2013	162 mm2013 · driest 22 mm in 2017	27
March	26.1°C29 Mar 2025	-15.6°C7 Mar 2003	88 mm30 Mar 2010	274 mm2010 · driest 22 mm in 2006	27
April	33.9°C17 Apr 2002	-6.0°C6 Apr 2016	93 mm23 Apr 2006	167 mm2019 · driest 41 mm in 2013	27
May	33.9°C31 May 2022	-1.1°C7 May 2001	65 mm26 May 2003	154 mm2009 · driest 11 mm in 2015	27
June	37.8°C24 Jun 2025	3.9°C1 Jun 2001	104 mm7 Jun 2013	256 mm2003 · driest 23 mm in 2004	27
July	39.4°C6 Jul 2010	7.8°C3 Jul 2001	96 mm18 Jul 2007	190 mm2009 · driest 19 mm in 2017	27
August	36.7°C2 Aug 2006	8.9°C26 Aug 2004	98 mm14 Aug 2011	198 mm2011 · driest 16 mm in 2005	26
September	33.9°C6 Sep 2023	2.2°C30 Sep 2000	80 mm28 Sep 2004	199 mm2008 · driest 12 mm in 2024	26
October	31.7°C2 Oct 2019	-2.8°C25 Oct 2003	203 mm14 Oct 2005	456 mm2005 · driest 3 mm in 2024	27
November	26.7°C3 Nov 2000	-17.1°C21 Nov 2018	48 mm21 Nov 2024	242 mm2018 · driest 15 mm in 2021	27
December	20.0°C5 Dec 2001	-16.1°C28 Dec 2004	63 mm11 Dec 2008	196 mm2012 · driest 29 mm in 2021	27

Typical days per month at SHIRLEY BROOKHAVEN AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	25	3
February	0	0	23	2
March	0	0	17	3
April	<1	<1	6	3
May	5	<1	<1	3
June	16	3	0	3
July	27	9	0	3
August	27	7	0	3
September	14	1	0	3
October	1	<1	2	3
November	<1	0	10	3
December	0	0	21	4

How often, not how much — every day in SHIRLEY BROOKHAVEN 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	<1%	26%	9%	25%	1.2–7.2°C
February	0%	29%	9%	34%	1.9–8.1°C
March	2%	28%	10%	32%	6.7–12.1°C
April	12%	30%	10%	38%	12.7–16.0°C
May	41%	31%	10%	37%	18.6–21.3°C
June	69%	26%	9%	27%	23.9–26.8°C
July	77%	23%	9%	20%	26.2–29.5°C
August	77%	23%	8%	22%	26.2–29.1°C
September	73%	22%	9%	19%	22.7–25.2°C
October	30%	25%	11%	25%	16.9–20.5°C
November	5%	24%	10%	25%	10.7–14.6°C
December	<1%	31%	13%	37%	4.8–9.6°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.

2000Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2020. Coolest: 2000.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5126208
NOAA station: USW00054790 · SHIRLEY BROOKHAVEN AP
Station distance: 3.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 40.80°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 20 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 SHIRLEY BROOKHAVEN AP is what differs

Shirley→Mastic Beach→North Bellport→Center Moriches→Yaphank→East Moriches→

Or put two places side by side: Mastic vs Shirley

Best time to visitMastic.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Mastic.

The whole year,
without the guesswork.

Nearby, measured,
and named.