Williamstown weather in October

In October, Williamstown sees average daytime highs of 67°F and overnight lows near 50°F, with 3.6 in of rain across 8 wet days and about 10.9 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 72°F in the first days to 62°F by the end. The sky is clear or mostly clear about 41% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 18 min by month's end. Set against the rest of the year, October is Williamstown's 1st-clearest and 7th-windiest month. For the whole year in context, see Williamstown's year-round climate.

Daytime high
67°
6th warmest
Overnight low
50°
7th coldest
Rainfall
3.6 in
8 wet days
Daylight
10 h 54 min
6:17 AM – 5:13 PM
Cloud cover
52%
1st clearest
Wind
7 mph
7th windiest
Solar energy
3.25 kWh/m²
Travel score
6.4
out of 10

Williamstown is census designated place in Gloucester County, New Jersey, United States.

Density
810/km²
people per km²
Founded
1737

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 72°F in the first days to 62°F by the end.

A typical October day in Williamstown reaches about 67°F in the afternoon and slips back to 50°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 77°F. Set against its neighbours, October runs about 11°F cooler than September and about 11°F warmer than November.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17256
27255
37255
47155
57154
67054
77053
87053
96953
106952
116952
126852
136851
146751
156750
166750
176650
186649
196549
206549
216548
226448
236447
246347
256347
266346
276246
286246
296245
306145
316145

How October really feels in Williamstown

Once humidity and wind are folded in, October 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

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

Williamstown weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 7th-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 October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in October, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of October, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25446
35446
45545
55545
65545
75545
85545
95644
105644
115644
125644
135644
145545
155644
165644
175545
185644
195545
205545
215545
225446
235446
245347
255248
265248
275248
285149
295149
305248
315149

Chance of precipitation in October

Any precipitation

Williamstown gets around 3.6 in of rain over 8 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
129
229
328
428
528
627
727
827
927
1027
1127
1227
1327
1428
1527
1627
1727
1827
1927
2026
2126
2226
2326
2426
2525
2625
2725
2825
2925
3025
3125

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1551815111
2571814101
3581813101
459181391
561181281
663171181
764171171
866171061
967161061
1068161051
116916951
127115941
137315831
147414831
157514821
167714720
177813720
187913710
198012710
208211610
218211610
228310610
238410510
248410510
258410510
268410510
278510410
28869410
29869410
30869410
31879310

Wind in October

Winds average 7 mph in October.

Across October, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167light breeze
177light 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 October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over October. Sunrise moves from 6:01 AM to 6:34 AM, and sunset from 5:37 PM to 4:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:015:37
211.56:025:35
311.56:035:33
411.56:045:32
511.46:055:30
611.46:065:28
711.36:075:27
811.36:085:25
911.26:105:24
1011.26:115:22
1111.16:125:21
1211.16:135:19
1311.16:145:18
1411.06:155:16
1511.06:165:15
1610.96:175:13
1710.96:185:12
1810.96:195:10
1910.86:205:09
2010.86:215:07
2110.76:225:06
2210.76:245:05
2310.66:255:03
2410.66:265:02
2510.66:275:01
2610.56:284:59
2710.56:294:58
2810.46:304:57
2910.46:314:56
3010.46:334:55
3110.36:344:53

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.25 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 — October's 3.25 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.4Moderate
113.4Moderate
123.4Moderate
133.4Moderate
143.3Moderate
153.3Moderate
163.3Moderate
173.2Moderate
183.2Moderate
193.2Moderate
203.1Moderate
213.1Moderate
223.0Moderate
233.0Moderate
243.0Moderate
252.9Moderate
262.9Moderate
272.9Moderate
282.8Moderate
292.8Moderate
302.8Moderate
312.8Moderate
Planning a trip in October

Hazard calendar for Williamstown

In seasonPeak

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

Williamstown 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 October a good time to visit Williamstown?

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

6.4
Sightseeing
3rd-best month of the year
2.9
Beach & pool
6th-best month of the year

October is a reasonable time to visit Williamstown for sightseeing.

What to pack for Williamstown in October

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

In October, Williamstown sees daytime highs around 67°F and nights near 50°F. Worth packing: rain gear. About 8 days see rain.

rain gear

Sea temperature near Williamstown in October

The nearest coast averages about 65°F in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 39 mi away) is warmest in August at about 75°F and coldest in February near 38°F.

It's comfortable for a long swim from Jun 21 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
Jan40Bracing
Feb38Bracing
Mar41Bracing
Apr48Bracing
May57Bracing
Jun67Cool
Jul74Refreshing
Aug75Warm
Sep73Refreshing
Oct65Cool
Nov55Bracing
Dec47Bracing

UV index in Williamstown in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Williamstown 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 Williamstown in October

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Williamstown 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 Williamstown?

Williamstown sits at 39.7°N, 75.0°W, 144 ft above sea level, in United States. The nearest listed city is Sicklerville, 2.5 mi away.

Topography around Williamstown

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

Within 2 miles, the terrain around Williamstown has only modest variations in elevation — a maximum elevation change of 85 ft around an average of 151 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 233 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,125 ft.

The land around Williamstown is covered by trees (60%) and grassland (23%) within 2 miles, trees (68%) within 10 miles, and trees (52%) and water (20%) within 50 miles.

2 miles
85 ft
10 miles
233 ft
50 miles
1,125 ft
treesgrasslandcroplandartificial surfaceswaterwetland
October weather nearby: Sicklerville 2.5 mi · Glassboro 6.2 mi · Jackson 9.3 mi · Lindenwold 9.3 mi · Sewell 9.9 mi · Vineland 14 mi · South Vineland 17 mi · Cherry Hill 17 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 Williamstown (39.6862°, -74.9952°, 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).