Mastic weather in May

In May, Mastic sees average daytime highs of 60°F and overnight lows near 53°F, with 3.3 in of rain across 10.2 wet days and about 14.2 hours of daylight. It is the 6th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 56°F in the first days to 64°F by the end. The sky is clear or mostly clear about 31% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of May to 14 h 42 min by month's end. Set against the rest of the year, May is Mastic's 11th-clearest and 8th-windiest month. For the whole year in context, see Mastic's year-round climate.

Daytime high
60°
6th warmest
Overnight low
53°
7th coldest
Rainfall
3.3 in
10.2 wet days
Daylight
14 h 18 min
4:40 AM – 6:56 PM
Cloud cover
61%
11th clearest
Wind
11 mph
8th windiest
Solar energy
6.04 kWh/m²
Travel score
4.8
out of 10

Mastic is census-designated place in Suffolk County, New York, United States.

Density
1,481/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 56°F in the first days to 64°F by the end.

A typical May day in Mastic reaches about 60°F in the afternoon and slips back to 53°F overnight — a 7°F spread between the day's warmth and the night's chill. On most days the high lands between 54°F and 66°F. Set against its neighbours, May runs about 9°F warmer than April and about 10°F cooler than June.

40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
15649
25649
35649
45750
55750
65750
75751
85851
95851
105851
115852
125952
135952
145953
156053
166053
176053
186154
196154
206154
216255
226255
236255
246356
256356
266357
276457
286457
296458
306558
316558

How May really feels in Mastic

Once humidity and wind are folded in, May averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Mastic weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 31°3.79.83.99.40.0
Feb40° / 31°3.49.13.510.40.0
Mar44° / 36°4.410.22.811.70.8
Apr52° / 45°3.610.30.413.12.7
May60° / 53°3.310.2014.24.8
Jun70° / 64°3.38.8014.96.7
Jul76° / 71°3.08.6014.67.2
Aug76° / 70°3.79.3013.67.2
Sep71° / 65°3.78.8012.36.9
Oct62° / 55°4.39010.95.5
Nov53° / 46°3.68.70.39.73.2
Dec45° / 37°4.610.62.29.11.1

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14654
24654
34654
44555
54555
64555
74555
84555
94555
104555
114456
124456
134456
144456
154456
164456
174456
184456
194456
204456
214456
224456
234555
244555
254555
264654
274654
284753
294753
304654
314654

Chance of precipitation in May

Any precipitation

Mastic gets around 3.3 in of rain over 10.2 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
134
233
333
433
533
633
734
834
934
1034
1134
1234
1334
1434
1534
1634
1734
1834
1934
2033
2133
2233
2332
2432
2531
2631
2731
2831
2931
3030
3130

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 79% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
198200
297300
397300
497300
596400
696400
795500
894600
993700
1093700
1192800
1290910
13891010
14881110
15861310
16841420
17831520
18801730
19791830
20762040
21732151
22702361
23682471
24652591
256227101
265928112
275629132
285529142
295330152
305031173
314832183

Wind in May

Winds average 11 mph in May.

Across May, daily wind ranges from about 10 mph on the calmest days to 11 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
111light breeze
211light breeze
311light breeze
411light breeze
511light breeze
611light breeze
711light breeze
811light breeze
911light breeze
1011light breeze
1111light breeze
1211light breeze
1311light breeze
1411light breeze
1511light breeze
1611light breeze
1711light breeze
1811light breeze
1911light breeze
2011light breeze
2111light breeze
2211light breeze
2311light breeze
2411light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze
3110light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 42 min at the start of May to 14 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over May. Sunrise moves from 4:57 AM to 4:28 AM, and sunset from 6:40 PM to 7:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.74:576:40
213.84:566:41
313.84:546:42
413.84:536:43
513.94:526:44
613.94:516:45
714.04:496:46
814.04:486:48
914.04:476:49
1014.14:466:50
1114.14:456:51
1214.14:446:52
1314.24:436:53
1414.24:426:54
1514.24:416:55
1614.34:406:56
1714.34:396:57
1814.34:386:58
1914.44:376:59
2014.44:367:00
2114.44:357:00
2214.54:347:01
2314.54:337:02
2414.54:337:03
2514.54:327:04
2614.64:317:05
2714.64:317:06
2814.64:307:07
2914.64:297:08
3014.74:297:08
3114.74:287:09

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.04 kWh/m².

For context, solar energy here swings from a low near 1.74 kWh/m² to a high of 6.55 kWh/m² in June across the year — May's 6.04 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
146.0Bright
156.0Bright
166.0Intense
176.0Intense
186.1Intense
196.1Intense
206.1Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.4Intense
316.4Intense
Planning a trip in May

Hazard calendar for Mastic

In seasonPeak

None of Mastic's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Mastic sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Mastic?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.8
Sightseeing
6th-best month of the year
0.7
Beach & pool
6th-best month of the year

May is a reasonable time to visit Mastic for sightseeing.

What to pack for Mastic in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Mastic sees daytime highs around 60°F and nights near 53°F. Pack sun protection. Worth having: a warm layer and rain gear. About 10 days see rain.

sun protectiona warm layerrain gear

Sea temperature near Mastic in May

The nearest coast averages about 53°F in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 12 mi away) is warmest in August at about 73°F and coldest in February near 40°F.

It's comfortable for a long swim from Jul 4 to Sep 22 — about 2.7 months when the water holds above 68°F.

40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan44Bracing
Feb40Bracing
Mar41Bracing
Apr45Bracing
May53Bracing
Jun64Cool
Jul71Refreshing
Aug73Refreshing
Sep69Refreshing
Oct63Cool
Nov56Bracing
Dec49Bracing

UV index in Mastic in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mastic peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Mastic in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Mastic is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1016 µg/m³Nov 178 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar14Moderate
Apr15Moderate
May16Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Mastic?

Mastic sits at 40.8°N, 72.8°W, 30 ft above sea level, in United States. The nearest listed city is Shirley, 1.2 mi away.

Topography around Mastic

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Mastic.

Within 2 miles, the terrain around Mastic has only modest variations in elevation — a maximum elevation change of 98 ft around an average of 46 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 328 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 965 ft.

The land around Mastic is covered by trees (63%) within 2 miles, trees (46%) and water (36%) within 10 miles, and water (59%) and trees (32%) within 50 miles.

2 miles
98 ft
10 miles
328 ft
50 miles
965 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
May weather nearby: Shirley 1.2 mi · Medford 8.7 mi · East Patchogue 8.7 mi · Coram 9.3 mi · Farmingville 9.9 mi · Holtsville 11 mi · Selden 11 mi · Holbrook 12 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mastic (40.802°, -72.8409°, elevation 30 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).