Glassboro weather in September

In September, Glassboro sees average daytime highs of 78°F and overnight lows near 61°F, with 3.9 in of rain across 9.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 81°F in the first days to 73°F by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Glassboro's 2nd-clearest and 9th-windiest month. For the whole year in context, see Glassboro's year-round climate.

Daytime high
78°
4th warmest
Overnight low
61°
9th coldest
Rainfall
3.9 in
9.3 wet days
Daylight
12 h 18 min
5:47 AM – 6:02 PM
Cloud cover
55%
2nd clearest
Wind
7 mph
9th windiest
Solar energy
4.3 kWh/m²
Travel score
6.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 81°F in the first days to 73°F by the end.

A typical September day in Glassboro reaches about 78°F in the afternoon and slips back to 61°F overnight — a 16°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 86°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18266
28266
38265
48165
58165
68165
78064
88064
98064
108063
117963
127963
137962
147862
157862
167861
177761
187760
197660
207660
217659
227659
237559
247558
257458
267458
277457
287357
297356
307356

How September really feels in Glassboro

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.

Glassboro weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan42° / 28°3.19.23.39.50.2
Feb44° / 29°3.093.210.40.8
Mar52° / 36°4.010.6211.72.8
Apr64° / 46°3.410.60.3135.5
May73° / 55°3.410.8014.26.5
Jun82° / 65°3.810.7014.86.0
Jul86° / 70°3.811.2014.54.9
Aug84° / 68°4.210.4013.65.5
Sep78° / 61°3.99.3012.36.9
Oct67° / 50°3.68010.96.4
Nov56° / 40°2.97.90.29.83.9
Dec46° / 33°3.99.41.89.21.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55347
65347
75347
85347
95347
105347
115347
125347
135347
145248
155248
165248
175149
185050
195050
205050
214951
224951
235050
245050
255149
265149
275149
285149
295248
305347

Chance of precipitation in September

Any precipitation

Glassboro gets around 3.9 in of rain over 9.3 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 30% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
330
430
530
630
730
830
930
1030
1130
1230
1329
1429
1529
1629
1729
1829
1929
2029
2130
2230
2330
2430
2530
2630
2729
2829
2929
3029

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 34% of days. Sticky, muggy-or-worse air turns up on roughly 25% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11820222416
21820222415
31920222415
42021212315
52121212214
62221212214
72321212113
82422212013
92622212012
102722211911
112821211911
123021211910
13312121189
14322121188
15342121178
16352121177
17362120176
18372020166
19392020165
20402020164
21412019154
22422019154
23432019153
24452018143
25462018142
26482017132
27492017132
28511916122
29511916122
30531915121

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min 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 78 minutes over September. Sunrise moves from 5:33 AM to 6:01 AM, and sunset from 6:28 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:336:28
212.95:346:26
312.85:356:24
412.85:366:23
512.75:376:21
612.75:376:19
712.75:386:18
812.65:396:16
912.65:406:14
1012.55:416:13
1112.55:426:11
1212.45:436:09
1312.45:446:08
1412.35:456:06
1512.35:466:04
1612.35:476:02
1712.25:486:01
1812.25:495:59
1912.15:505:57
2012.15:515:56
2112.05:525:54
2212.05:535:52
2311.95:545:51
2411.95:555:49
2511.95:565:47
2611.85:575:45
2711.85:585:44
2811.75:595:42
2911.76:005:40
3011.66:015:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.3 kWh/m².

For context, solar energy here swings from a low near 1.86 kWh/m² to a high of 6.13 kWh/m² in June across the year — September's 4.3 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.8Bright
54.7Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.5Bright
134.4Bright
144.4Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.1Bright
214.1Bright
224.1Bright
234.0Bright
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Glassboro

In seasonPeak

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

Glassboro 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 Glassboro?

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

6.9
Sightseeing
1st-best month of the year
6.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Glassboro for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Glassboro in September

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

In September, Glassboro sees daytime highs around 78°F and nights near 61°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Glassboro in September

The nearest coast averages about 73°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 40 mi away) is warmest in August at about 76°F and coldest in February near 37°F.

It's comfortable for a long swim from Jun 20 to Oct 3 — about 3.5 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan39Bracing
Feb37Bracing
Mar41Bracing
Apr48Bracing
May57Bracing
Jun67Cool
Jul74Refreshing
Aug76Warm
Sep73Refreshing
Oct65Cool
Nov54Bracing
Dec45Bracing

UV index in Glassboro 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 Glassboro peaks around July 11 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 8Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Glassboro 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 Glassboro is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 129 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar15Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep12Good
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Glassboro?

Glassboro sits at 39.7°N, 75.1°W, 144 ft above sea level, in United States. The nearest listed city is Sewell, 5.0 mi away.

Topography around Glassboro

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

Within 2 miles, the terrain around Glassboro has only modest variations in elevation — a maximum elevation change of 135 ft around an average of 148 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 246 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,312 ft.

The land around Glassboro is covered by trees (64%) within 2 miles, trees (59%) within 10 miles, and trees (55%) within 50 miles.

2 miles
135 ft
10 miles
246 ft
50 miles
1,312 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Sewell 5.0 mi · Williamstown 6.2 mi · Sicklerville 7.5 mi · Lindenwold 11 mi · Jackson 14 mi · Whitman 15 mi · Lower Moyamensing 16 mi · Camden 16 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 Glassboro (39.7029°, -75.1118°, elevation 144 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).