South Plainfield weather in July

In July, South Plainfield sees average daytime highs of 86°F and overnight lows near 69°F, with 4.2 in of rain across 11.2 wet days and about 14.6 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 86°F through the month. The sky is clear or mostly clear about 26% of the time in July, and the air most often feels muggy.

Daylight stretches from about 14 h 54 min at the start of July to 14 h 12 min by month's end. Set against the rest of the year, July is South Plainfield's 7th-clearest and 11th-windiest month. For the whole year in context, see South Plainfield's year-round climate.

Daytime high
86°
1st warmest
Overnight low
69°
12th coldest
Rainfall
4.2 in
11.2 wet days
Daylight
14 h 36 min
4:44 AM – 7:22 PM
Cloud cover
60%
7th clearest
Wind
6 mph
11th windiest
Solar energy
5.88 kWh/m²
Travel score
4.9
out of 10

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 86°F through the month.

A typical July day in South Plainfield reaches about 86°F in the afternoon and slips back to 69°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 93°F. Set against its neighbours, July runs about 5°F warmer than June and about 2°F warmer than August.

60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18567
28567
38567
48568
58568
68568
78568
88668
98668
108668
118669
128669
138669
148669
158669
168669
178669
188669
198669
208669
218669
228669
238669
248669
258669
268669
278569
288569
298569
308569
318569

How July really feels in South Plainfield

Once humidity and wind are folded in, July 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

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

South Plainfield weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 26°3.39.24.19.40.0
Feb42° / 27°3.08.53.510.40.4
Mar50° / 34°4.210.52.911.72.3
Apr62° / 44°3.710.70.3135.0
May71° / 54°3.611.4014.26.3
Jun81° / 63°4.211.2014.86.0
Jul86° / 69°4.211.2014.64.9
Aug83° / 67°4.110.2013.65.8
Sep76° / 60°4.09.1012.36.9
Oct65° / 49°3.78.60.110.96.1
Nov54° / 38°3.07.90.49.73.4
Dec44° / 31°4.09.42.29.20.8

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 22% of July, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24753
34951
44852
54852
64951
75050
85050
95050
105149
115050
125050
135050
145050
154951
164852
174852
184753
194753
204753
214654
224654
234654
244654
254654
264654
274555
284654
294753
304753
314753

Chance of precipitation in July

Any precipitation

South Plainfield gets around 4.2 in of rain over 11.2 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
435
535
635
734
834
934
1033
1133
1233
1333
1434
1534
1635
1735
1836
1937
2037
2138
2238
2339
2439
2539
2639
2739
2839
2939
3038
3138

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the muggy band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 46% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
116202528110
216202528120
316202428120
416192428120
516192428120
616192428130
716192428131
816192428131
915182428131
1015182428141
1115182528141
1214182528151
1314172529151
1413172529161
1513172529161
1612172529171
1712172529171
1811172530171
1910162530181
2010162531181
219162531181
229162532181
239162531181
248152632180
258152732180
268162731180
278162731180
288162730180
299162730180
309162730180
3110162729170

Wind in July

Winds average 6 mph in July.

Across July, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 14 h 54 min at the start of July to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over July. Sunrise moves from 4:35 AM to 4:57 AM, and sunset from 7:27 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.94:357:27
214.94:357:27
314.94:367:27
414.84:367:27
514.84:377:27
614.84:377:26
714.84:387:26
814.84:397:26
914.84:397:25
1014.84:407:25
1114.74:417:25
1214.74:417:24
1314.74:427:24
1414.74:437:23
1514.74:437:23
1614.64:447:22
1714.64:457:22
1814.64:467:21
1914.64:477:20
2014.54:477:20
2114.54:487:19
2214.54:497:18
2314.54:507:18
2414.44:517:17
2514.44:527:16
2614.44:537:15
2714.34:547:14
2814.34:547:13
2914.34:557:12
3014.34:567:11
3114.24:577:10

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.88 kWh/m².

For context, solar energy here swings from a low near 1.77 kWh/m² to a high of 5.97 kWh/m² in June across the year — July's 5.88 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.1Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.1Intense
106.1Intense
116.0Intense
126.0Intense
136.0Intense
146.0Bright
156.0Bright
165.9Bright
175.9Bright
185.9Bright
195.8Bright
205.8Bright
215.8Bright
225.7Bright
235.7Bright
245.7Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in July

Hazard calendar for South Plainfield

In seasonPeak

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

South Plainfield 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 July a good time to visit South Plainfield?

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

4.9
Sightseeing
7th-best month of the year
6.7
Beach & pool
2nd-best month of the year

July is a reasonable time to visit South Plainfield for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for South Plainfield in July

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

In July, South Plainfield sees daytime highs around 86°F and nights near 69°F. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near South Plainfield in July

The nearest coast averages about 72°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 29 mi away) is warmest in August at about 74°F and coldest in February near 40°F.

It's comfortable for a long swim from Jun 30 to Sep 26 — about 2.9 months when the water holds above 68°F.

40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan43Bracing
Feb40Bracing
Mar41Bracing
Apr46Bracing
May55Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct63Cool
Nov55Bracing
Dec48Bracing

UV index in South Plainfield in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in South Plainfield 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 21 at about 1 (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 21UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov3Moderate
Dec1Low

Air quality in South Plainfield in July

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in South Plainfield is worst in July — around 18 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (November, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1318 µg/m³Nov 1410 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar16Moderate
Apr16Moderate
May17Moderate
Jun17Moderate
Jul18Moderate
Aug16Moderate
Sep14Moderate
Oct11Good
Nov10Good
Dec12Good
Location & terrain

Where is South Plainfield?

South Plainfield sits at 40.6°N, 74.4°W, 59 ft above sea level, in United States. The nearest listed city is North Plainfield, 3.7 mi away.

Topography around South Plainfield

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

Within 2 miles, the terrain around South Plainfield has only modest variations in elevation — a maximum elevation change of 197 ft around an average of 102 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 650 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,834 ft.

The land around South Plainfield is covered by trees (56%) and artificial surfaces (30%) within 2 miles, trees (59%) and artificial surfaces (26%) within 10 miles, and trees (58%) within 50 miles.

2 miles
197 ft
10 miles
650 ft
50 miles
1,834 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
July weather nearby: North Plainfield 3.7 mi · Plainfield 3.7 mi · Edison 4.3 mi · Iselin 5.0 mi · Scotch Plains 5.6 mi · Piscataway 5.6 mi · Colonia 5.6 mi · Warren Township 6.2 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 South Plainfield (40.5793°, -74.4115°, elevation 59 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).