Setauket-East Setauket weather in August

In August, Setauket-East Setauket sees average daytime highs of 78°F and overnight lows near 70°F, with 4.0 in of rain across 9.5 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 78°F through the month. The sky is clear or mostly clear about 39% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 12 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Setauket-East Setauket's 3rd-clearest and 12th-windiest month. For the whole year in context, see Setauket-East Setauket's year-round climate.

Daytime high
78°
2nd warmest
Overnight low
70°
11th coldest
Rainfall
4.0 in
9.5 wet days
Daylight
13 h 36 min
5:07 AM – 6:46 PM
Cloud cover
53%
3rd clearest
Wind
8 mph
12th windiest
Solar energy
5.57 kWh/m²
Travel score
7.0
out of 10

Setauket-East Setauket is former census-designated place in Suffolk County, New York, United States.

Density
641/km²
people per km²

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 78°F through the month.

A typical August day in Setauket-East Setauket reaches about 78°F in the afternoon and slips back to 70°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 83°F. Set against its neighbours, August runs on par with July and about 6°F warmer than September.

60°70°80°151015202531
Avg high (°F)Avg low (°F)
17971
27971
37971
47971
57971
67971
77871
87871
97871
107871
117871
127870
137870
147870
157870
167870
177870
187770
197770
207769
217769
227769
237769
247769
257769
267669
277669
287668
297668
307668
317668

How August really feels in Setauket-East Setauket

Once humidity and wind are folded in, August 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

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

Setauket-East Setauket weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan38° / 29°3.79.74.29.40.0
Feb38° / 29°3.49.13.810.40.0
Mar44° / 35°4.610.63.311.70.7
Apr53° / 44°3.910.70.413.13.0
May63° / 53°3.510.8014.35.3
Jun72° / 64°3.69.7014.96.7
Jul78° / 70°3.29.2014.66.9
Aug78° / 70°4.09.5013.67.0
Sep72° / 64°3.89.1012.36.9
Oct62° / 54°4.49.40.110.95.5
Nov53° / 44°3.79.10.39.73.0
Dec44° / 35°4.810.62.49.10.7

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25644
35644
45644
55644
65644
75644
85446
95446
105446
115347
125347
135347
145446
155446
165446
175545
185545
195545
205644
215644
225842
235842
245842
255941
265941
275842
285842
295842
305743
315743

Chance of precipitation in August

Any precipitation

Setauket-East Setauket gets around 4.0 in of rain over 9.5 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 31% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
132
232
332
432
532
632
732
833
933
1034
1134
1234
1334
1434
1534
1634
1733
1833
1932
2031
2131
2230
2329
2428
2528
2627
2727
2826
2926
3026
3126

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 32% of days. Sticky, muggy-or-worse air turns up on roughly 56% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
12112235301
22112234301
32122234291
42122234291
53122234291
63122233291
73122333291
83122333281
93122333281
103122333271
114122333271
124122334261
134122434251
144132434251
154132434241
164132534231
174132534221
185142634211
195142634210
205152634200
215152733190
226162832190
236162832180
246172931170
257172930170
268182930160
278182929150
289192929150
299192928150
3010192928140
3110192928140

Wind in August

Winds average 8 mph in August, the calmest month.

Across August, daily wind ranges from about 8 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 12 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 4:52 AM to 5:22 AM, and sunset from 7:05 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.24:527:05
214.24:537:04
314.14:547:03
414.14:557:01
514.14:567:00
614.04:576:59
714.04:586:58
814.04:596:57
913.95:006:55
1013.95:016:54
1113.85:026:53
1213.85:036:51
1313.85:046:50
1413.75:056:49
1513.75:066:47
1613.65:076:46
1713.65:086:44
1813.65:096:43
1913.55:106:42
2013.55:116:40
2113.45:126:39
2213.45:136:37
2313.45:146:35
2413.35:156:34
2513.35:166:32
2613.25:176:31
2713.25:186:29
2813.15:196:27
2913.15:206:26
3013.05:216:24
3113.05:226:22

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.57 kWh/m².

For context, solar energy here swings from a low near 1.74 kWh/m² to a high of 6.34 kWh/m² in June across the year — August's 5.57 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.7Bright
125.6Bright
135.6Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.2Bright
285.2Bright
295.2Bright
305.1Bright
315.1Bright
Planning a trip in August

Hazard calendar for Setauket-East Setauket

In seasonPeak

In August, Setauket-East Setauket sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Setauket-East Setauket 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 August a good time to visit Setauket-East Setauket?

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

7.0
Sightseeing
1st-best month of the year
6.4
Beach & pool
2nd-best month of the year

August is one of the better times to visit Setauket-East Setauket for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Setauket-East Setauket in August

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

In August, Setauket-East Setauket sees daytime highs around 78°F and nights near 70°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Setauket-East Setauket in August

The nearest coast averages about 74°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 14 mi away) is warmest in August at about 74°F and coldest in February near 35°F.

It's comfortable for a long swim from Jul 1 to Sep 30 — about 3 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan39Bracing
Feb35Bracing
Mar37Bracing
Apr44Bracing
May54Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct64Cool
Nov55Bracing
Dec46Bracing

UV index in Setauket-East Setauket in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Setauket-East Setauket 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery 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 Setauket-East Setauket in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Setauket-East Setauket is worst in July — around 20 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1120 µg/m³Nov 188 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr16Moderate
May19Moderate
Jun20Moderate
Jul20Moderate
Aug17Moderate
Sep13Moderate
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is Setauket-East Setauket?

Setauket-East Setauket sits at 40.9°N, 73.1°W, 102 ft above sea level, in United States. The nearest listed city is East Setauket, 0.6 mi away.

Topography around Setauket-East Setauket

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

Within 2 miles, the terrain around Setauket-East Setauket has only modest variations in elevation — a maximum elevation change of 285 ft around an average of 121 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 338 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,457 ft.

The land around Setauket-East Setauket is covered by trees (77%) within 2 miles, water (45%) and trees (42%) within 10 miles, and water (47%) and trees (41%) within 50 miles.

2 miles
285 ft
10 miles
338 ft
50 miles
1,457 ft
treesgrasslandartificial surfaceswaterwetland
August weather nearby: East Setauket 0.6 mi · Centereach 5.0 mi · Selden 5.6 mi · Coram 6.8 mi · Lake Ronkonkoma 6.8 mi · Smithtown 7.5 mi · Farmingville 8.1 mi · Ronkonkoma 8.1 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 Setauket-East Setauket (40.9306°, -73.1018°, elevation 102 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).