Weather StoryAlmanac, microseasons, and the day's weather story.

Trenton, New Jersey Weather

Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →

Trenton weather forecast — hour by hour, 7-day outlook, NOAA radar

Trenton, NJ
Saturday, July 4 at 1:07 PM
97
°
Clear
Feels like
101°
Humidity
34%
Wind
10 mph
Sunrise
1:35 AM
Sunset
4:32 PM
Trenton, NJ
Hour by hour · 24h
24-Hour ForecastTrenton, NJ: 24-hour forecast. Temperatures range from 74 to 100 degrees Fahrenheit with a 55% chance of precipitation at 10 PM.
L 74°H 100°
Trenton, NJ
7-day forecast
  1. Today
    Jul 4
    Rain
    55%
    0.23″
    100°73°—
  2. Sunday
    Jul 5
    Rain
    50%
    0.41″
    93°72°-7°
  3. Monday
    Jul 6
    Thunderstorm
    91%
    0.29″
    76°65°-17°
  4. Tuesday
    Jul 7
    Light Drizzle
    81%
    0.01″
    66°59°-10°
  5. Wednesday
    Jul 8
    Mostly Clear
    17%
    —
    87°56°+21°
  6. Thursday
    Jul 9
    Light Drizzle
    16%
    —
    90°67°+3°
  7. Friday
    Jul 10
    Drizzle
    36%
    0.07″
    94°70°+4°
Trenton, NJ
Next 24 hours · Hot now
HOT 90°65°85°105°12p6p12a6anow 97°high 100°low 74°PRECIP %
Trenton, NJ
Anemometer · 24h winds · from true
NESW
From · True
W
280° · veering 24°
Direction
W
280°
Sustained
10
mph
Gust
17
mph
Peak 24h
18
avg 6
Beaufort · 3 · GENTLE BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 6 · pk 18 @ 12:00p
010203040MPHB1B2B3B4B5B6B7B8-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 361SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 24° from the w.
Trenton, NJ
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1010.8
-1.1 mb in 3h · falling · 29.85 inHg
Now
1010.8
mb
3h
-1.1
mb
12h
-1.2
mb
24h
-2.0
mb
Regime · CHANGE
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1010–1013
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1012.81010.11010.8
−24h−18h−12h−6hnow
Pressure slipping through the change line — wetter air on the way.
Trenton, NJ
Air quality
57
AQI
Moderate
↑+5 in 6h▲Peak ~106 @ 11 PM

AQI 57 (Moderate), driven by Ozone. AQI up 5 over the last 6 hours (gradual rise). Ozone at AQI 106 now. With UV 8.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 124 around 1 PM.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5Good
8.8μg/m³
PM 10Good
10μg/m³
NO₂Good
1μg/m³
OzoneDRIVERUnhealthy
142μg/m³
UV IndexVery high
8.8

What's driving it

Ozone × UV × Sky

Ozone at AQI 106 now. With UV 8.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 124 around 1 PM.

Present
AQI 106
UV peak
8.8 at 1 PM
Sky at peak
clear
Projected peak
AQI 124

PM × Wind × Precip

PM2.5 at 8.8 µg/m³, PM10 at 9.6 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.92
Wind
breezy
Recent rain
0h in last 6h
Pattern
background

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³420
Trenton, NJ
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
114.8mi
UNLIMITED
116 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
17:07 UTC · Trenton, NJ · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
17:07 UTC · Trenton, NJ · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Trenton, NJ
Satellite · infrared · animated
Trenton, NJ
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Trenton, NJ
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:03 AM
Sunrise
1:35 AM
Daylight
14h 57m
Sunset
4:32 PM
Civil dusk
9:05 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Trenton, NJ
The moon
Waning Gibbous
80% illuminated
Moonrise
10:53 PM
Moonset
10:02 AM
In sign
♓︎ Pisces
Trenton, NJ
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Trenton at a glance

  • Today vs. normal: 26°F above the seasonal normal for this latitude
  • Last frost: April 17 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP codes: 08608, 08609, 08610, 08611, 08618, 08619, 08620, 08628 +3 more

16-Day Forecast — Trenton

  1. Sat100°73°55%
  2. Sun93°72°50%
  3. Mon76°65°91%
  4. Tue66°59°81%
  5. Wed87°56°17%
  6. Thu90°67°16%
  7. Fri94°70°36%
  8. Sat82°72°33%
  9. Sun72°68°28%
  10. Mon71°66°23%
  11. Tue80°63°22%
  12. Wed89°67°23%
  13. Thu95°72°26%
  14. Fri96°78°29%
  15. Sat79°72°20%
  16. Sun88°69°23%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near Trenton

Right now in the garden

Peak growing season

As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Trenton

SPC has placed Trenton in the Slight Risk category for severe thunderstorms today.

  • TODAYSLGTSlight Risk
  • TOMORROWMRGLMarginal Risk
  • DAY 3TSTMGeneral Thunderstorms

Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 185 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

Trenton's warmest month is July (~77°F mean) and its coldest is January (~31°F). Rainfall peaks in August (4.2 inches) and bottoms out in October (3.0 inches).

MonthMean tempPrecipRainy days
January31°3.5″13
February33°3.1″12
March42°3.8″15
April53°4.0″16
May61°3.7″17
June71°3.8″17
July77°3.8″16
August76°4.2″17
September69°3.7″13
October58°3.0″11
November45°3.7″12
December36°4.2″13

Regional context

Per NOAA NCEI 1991-2020 normals, Trenton runs from a 31°F January mean to 77°F in July, a 46°F seasonal spread, with near 44.4 inches of precipitation across about 173 wet days.

No season owns Trenton's rain: August reaches 4.2 inches across 17.2 days and October keeps 3.0 inches on 10.6, an even spread through Trenton's year. It is a balanced pattern Trenton shares with places like The College of New Jersey, NJ, Mercerville, NJ and White Horse, NJ.

Around mid-April, Trenton sheds its freezing nights — peas, lettuce, spinach, and radishes go into Trenton's beds. Heat-demanding starts go out a fortnight on in Trenton, after the soil warms and cold snaps clear. By mid-November, frost is back in Trenton — protect or harvest anything tender. Trenton's low ground holds frost later into spring than Trenton's benches, which run 3-5 days ahead.

Similar climates: The College of New Jersey, NJ, Mercerville, NJ, White Horse, NJ, Lawrenceville, NJ, Hamilton Square, NJ.

Naturalist notes

Late May brings the arrival of migrating warblers to Trenton's parks and wooded areas, their songs filling the canopy as they search for insects among newly emerged leaves.

Cherry blossoms typically reach peak bloom in mid-April, coinciding with the last expected frost dates in the region.

Frequently asked

When does it freeze in Trenton?
In Trenton, expect the last spring frost near mid-April; Trenton's first autumn frost comes around mid-November.
What is the rainy season in Trenton?
Rainfall in Trenton peaks in August near 4.2 inches, out of about 44 inches annually.
What is the warmest month in Trenton?
The warmest stretch in Trenton comes in July, around 77°F on average.
What is the coldest month in Trenton?
On average January is the chilliest month in Trenton, about 31°F.
When can I start a vegetable garden in Trenton?
Trenton's last frost (mid-April) cues hardy greens; in Trenton, hold heat-lovers two weeks past.
How many rainy days does Trenton get?
Expect roughly 173 wet days a year in Trenton.
What hardiness zone is Trenton?
Trenton sits in the USDA zone set by January lows near 31°F; the USDA ZIP tool gives the band.
What is the 10-day forecast for Trenton?
Trenton's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Trenton?
See this week's day-by-day rain chances for Trenton in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Trenton?
Current conditions for Trenton and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Trenton forecast updated?
The Trenton forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Trenton?
Today's sunrise and sunset times for Trenton are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Trenton?
The next few days in Trenton's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Trenton's warm-summer humid continental climate in New Jersey pairs 31°F Januarys with 77°F Julys, 46°F apart across the seasons.

Trenton sees close to 44 inches of precipitation annually, falling across some 173 wet days.

The 46°F gap between Trenton's summer and winter, at 40.2°N, shapes Trenton's frost calendar.

All cities in New Jersey →

Philadelphia, PA weather →

ZIP codes in Trenton

  • 08638
  • 08611
  • 08618
  • 08629
  • 08609
  • 08608
  • 08601
  • 08603
  • 08604
  • 08605
  • 08607
  • 08625
  • 08645
  • 08646
  • 08647
  • 08666
  • 08695

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.