Trenton weather in August

In August, Trenton sees average daytime highs of 84°F and overnight lows near 67°F, with 4.0 in of rain across 10.4 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 82°F by the end. The sky is clear or mostly clear about 28% 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 Trenton's 4th-clearest and 12th-windiest month. For the whole year in context, see Trenton's year-round climate.

Daytime high
84°
2nd warmest
Overnight low
67°
11th coldest
Rainfall
4.0 in
10.4 wet days
Daylight
13 h 36 min
5:15 AM – 6:51 PM
Cloud cover
58%
4th clearest
Wind
5 mph
12th windiest
Solar energy
5.21 kWh/m²
Travel score
5.6
out of 10

Trenton is capital city of the U.S. state of New Jersey and seat of Mercer County.

Density
4,218/km²
people per km²
Founded
1719

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 85°F in the first days to 82°F by the end.

A typical August day in Trenton reaches about 84°F in the afternoon and slips back to 67°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 76°F and 91°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18569
28569
38569
48569
58569
68568
78568
88568
98568
108468
118468
128468
138468
148467
158467
168467
178367
188367
198367
208367
218367
228366
238366
248366
258366
268366
278266
288265
298265
308265
318265

How August really feels in Trenton

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.

Trenton weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 27°3.39.33.89.50.0
Feb43° / 28°3.08.83.410.40.5
Mar51° / 35°4.210.32.611.72.5
Apr63° / 45°3.610.60.3135.2
May72° / 54°3.511.4014.26.4
Jun81° / 63°4.010.8014.86.0
Jul86° / 69°4.211.3014.64.9
Aug84° / 67°4.010.4013.65.6
Sep77° / 60°4.09.2012.36.9
Oct65° / 49°3.68.40.110.96.2
Nov54° / 39°2.97.80.39.83.5
Dec45° / 31°4.09.41.99.21.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 22% of August, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34852
44852
54852
64852
74753
84753
94753
104753
114753
124753
134852
144852
154753
164852
174852
184951
194951
205050
215149
225149
235149
245149
255248
265248
275248
285347
295347
305347
315347

Chance of precipitation in August

Any precipitation

Trenton gets around 4.0 in of rain over 10.4 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 34% and peaks near 39% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
139
238
338
438
538
638
738
838
938
1038
1138
1237
1337
1437
1537
1636
1736
1835
1934
2033
2132
2231
2330
2430
2529
2628
2728
2828
2927
3027
3128

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 28% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1915253119
21015253119
31015253019
41115253019
51115243019
61115243019
71115243019
81215243019
91215243019
101215243019
111215243019
121215243018
131315243018
141315253017
151315253017
161316252917
171316252916
181316262816
191417262816
201417262715
211518262715
221518262614
231618262614
241719252514
251720252414
261820252414
271920242313
282021242313
292021232213
302121232213
312121232113

Wind in August

Winds average 5 mph in August, the calmest month.

Across August, 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
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
266calm
276calm
286calm
296calm
306calm
316calm

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 5:00 AM to 5:30 AM, and sunset from 7:10 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.25:007:10
214.15:017:09
314.15:027:08
414.15:037:06
514.05:047:05
614.05:057:04
713.95:067:03
813.95:077:02
913.95:087:01
1013.85:096:59
1113.85:106:58
1213.85:116:57
1313.75:126:55
1413.75:136:54
1513.65:146:53
1613.65:156:51
1713.65:166:50
1813.55:176:48
1913.55:186:47
2013.45:196:45
2113.45:206:44
2213.45:216:42
2313.35:226:41
2413.35:236:39
2513.25:246:38
2613.25:256:36
2713.15:266:35
2813.15:276:33
2913.15:286:32
3013.05:296:30
3113.05:306:28

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.21 kWh/m².

For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 6.01 kWh/m² in June across the year — August's 5.21 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Hazard calendar for Trenton

In seasonPeak

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

Trenton 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 Trenton?

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

5.6
Sightseeing
5th-best month of the year
6.8
Beach & pool
1st-best month of the year

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

What to pack for Trenton in August

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

In August, Trenton sees daytime highs around 84°F and nights near 67°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Trenton 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 Trenton peaks around July 11 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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
May8Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Trenton 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 Trenton 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 1518 µg/m³Nov 149 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May16Moderate
Jun17Moderate
Jul18Moderate
Aug15Moderate
Sep13Moderate
Oct10Good
Nov9Good
Dec10Good
Location & terrain

Where is Trenton?

Trenton sits at 40.2°N, 74.7°W, 56 ft above sea level, in United States. The nearest listed city is Mercerville-Hamilton Square, 3.7 mi away.

Topography around Trenton

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

Within 2 miles, the terrain around Trenton has only modest variations in elevation — a maximum elevation change of 135 ft around an average of 59 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 515 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,535 ft.

The land around Trenton is covered by artificial surfaces (53%) and trees (32%) within 2 miles, trees (56%) within 10 miles, and trees (62%) within 50 miles.

2 miles
135 ft
10 miles
515 ft
50 miles
1,535 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Mercerville-Hamilton Square 3.7 mi · Ewing 5.0 mi · Levittown 6.2 mi · Princeton 9.9 mi · Bensalem 14 mi · Parkwood Manor 15 mi · Willingboro 15 mi · Somerton 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 Trenton (40.2171°, -74.7429°, elevation 56 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). 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).