Farmingville weather in September

In September, Farmingville sees average daytime highs of 71°F and overnight lows near 65°F, with 3.7 in of rain across 8.9 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 74°F in the first days to 68°F by the end. The sky is clear or mostly clear about 42% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Farmingville's 3rd-clearest and 8th-windiest month. For the whole year in context, see Farmingville's year-round climate.

Daytime high
71°
3rd warmest
Overnight low
65°
10th coldest
Rainfall
3.7 in
8.9 wet days
Daylight
12 h 18 min
5:38 AM – 5:54 PM
Cloud cover
52%
3rd clearest
Wind
10 mph
8th windiest
Solar energy
4.49 kWh/m²
Travel score
6.9
out of 10

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

Density
1,450/km²
people per km²

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 74°F in the first days to 68°F by the end.

A typical September day in Farmingville reaches about 71°F in the afternoon and slips back to 65°F overnight — a 6°F spread between the day's warmth and the night's chill. On most days the high lands between 66°F and 76°F. Set against its neighbours, September runs about 5°F cooler than August and about 9°F warmer than October.

50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17468
27468
37468
47468
57467
67367
77367
87367
97367
107366
117266
127266
137265
147165
157165
167165
177164
187064
197064
207064
217063
226963
236963
246962
256862
266862
276861
286761
296761
306760

How September really feels in Farmingville

Once humidity and wind are folded in, September 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

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

Farmingville weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 31°3.79.949.40.0
Feb39° / 30°3.49.33.710.40.0
Mar44° / 36°4.410.22.811.70.8
Apr52° / 44°3.610.50.413.12.7
May61° / 53°3.310.2014.24.9
Jun70° / 64°3.49.6014.96.6
Jul77° / 71°3.28.8014.67.2
Aug76° / 70°3.89.4013.67.2
Sep71° / 65°3.78.9012.36.9
Oct62° / 55°4.38.9010.95.5
Nov53° / 45°3.68.80.39.73.1
Dec45° / 37°4.610.32.39.11.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
45842
55842
65842
75842
85842
95743
105743
115743
125644
135644
145644
155545
165545
175446
185347
195248
205347
215248
225248
235248
245248
255347
265347
275347
285446
295446
305446

Chance of precipitation in September

Any precipitation

Farmingville gets around 3.7 in of rain over 8.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
126
226
326
427
527
627
727
827
927
1027
1127
1227
1327
1427
1527
1627
1728
1828
1928
2029
2129
2230
2330
2431
2531
2631
2731
2831
2931
3031

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 26% of days. Sticky, muggy-or-worse air turns up on roughly 29% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1820273015
2920272915
31020262915
41120262814
51320262813
61420262713
71520262712
81620262711
91820262610
10192125269
11202125268
12212125257
13232125257
14242125246
15262125245
16272125234
17282124234
18302124223
19312124223
20322124212
21332123202
22342223192
23362222191
24372222181
25392221171
26402221161
27422220151
28432220141
29442219141
30462219130

Wind in September

Winds average 10 mph in September.

Across September, 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.

051015151015202530
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2311light breeze
2411light breeze
2511light breeze
2611light breeze
2711light breeze
2811light breeze
2911light breeze
3011light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:23 AM to 5:53 AM, and sunset from 6:20 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:236:20
212.95:246:19
312.95:256:17
412.85:266:15
512.85:276:14
612.75:286:12
712.75:296:10
812.65:306:08
912.65:316:07
1012.55:326:05
1112.55:336:03
1212.55:346:01
1312.45:356:00
1412.45:365:58
1512.35:375:56
1612.35:385:54
1712.25:395:53
1812.25:405:51
1912.15:415:49
2012.15:435:47
2112.05:445:46
2212.05:455:44
2311.95:465:42
2411.95:475:40
2511.85:485:39
2611.85:495:37
2711.85:505:35
2811.75:515:33
2911.75:525:32
3011.65:535:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.49 kWh/m².

For context, solar energy here swings from a low near 1.75 kWh/m² to a high of 6.48 kWh/m² in June across the year — September's 4.49 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Farmingville

In seasonPeak

In September, Farmingville sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Farmingville 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 September a good time to visit Farmingville?

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

6.9
Sightseeing
3rd-best month of the year
4.6
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Farmingville for sightseeing.

What to pack for Farmingville in September

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

In September, Farmingville sees daytime highs around 71°F and nights near 65°F. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Farmingville in September

The nearest coast averages about 70°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 15 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 3 to Sep 23 — about 2.7 months when the water holds above 68°F.

40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan43Bracing
Feb40Bracing
Mar40Bracing
Apr45Bracing
May54Bracing
Jun64Cool
Jul72Refreshing
Aug73Refreshing
Sep70Refreshing
Oct63Cool
Nov55Bracing
Dec49Bracing

UV index in Farmingville in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Farmingville 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 Farmingville in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Farmingville 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 Farmingville?

Farmingville sits at 40.8°N, 73.0°W, 105 ft above sea level, in United States. The nearest listed city is Holtsville, 1.2 mi away.

Topography around Farmingville

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

Within 2 miles, the terrain around Farmingville has only modest variations in elevation — a maximum elevation change of 282 ft around an average of 148 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 335 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,056 ft.

The land around Farmingville is covered by trees (68%) within 2 miles, trees (61%) within 10 miles, and water (53%) and trees (35%) within 50 miles.

2 miles
282 ft
10 miles
335 ft
50 miles
1,056 ft
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Holtsville 1.2 mi · Medford 1.9 mi · Selden 2.5 mi · Holbrook 3.1 mi · Coram 3.1 mi · Centereach 4.3 mi · East Patchogue 5.0 mi · Lake Ronkonkoma 5.6 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 Farmingville (40.8312°, -73.0296°, elevation 105 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).