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Hamilton Square, New Jersey Weather

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

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

Hamilton Square, NJ
Saturday, July 4 at 7:19 PM
96
°
Clear
Feels like
99°
Humidity
36%
Wind
5 mph
Sunrise
1:34 AM
Sunset
4:31 PM
Hamilton Square, NJ
Hour by hour · 24h
24-Hour ForecastHamilton Square, NJ: 24-hour forecast. Temperatures range from 74 to 97 degrees Fahrenheit with a 50% chance of precipitation at 11 PM.
L 74°H 97°
Hamilton Square, NJ
7-day forecast
  1. Today
    Jul 4
    Heavy Rain
    50%
    0.56″
    98°74°—
  2. Sunday
    Jul 5
    Heavy Rain
    53%
    1.1″
    88°72°-10°
  3. Monday
    Jul 6
    Thunderstorm
    92%
    0.55″
    78°71°-10°
  4. Tuesday
    Jul 7
    Light Showers
    90%
    0.02″
    75°66°-3°
  5. Wednesday
    Jul 8
    Overcast
    23%
    —
    79°65°+4°
  6. Thursday
    Jul 9
    Overcast
    11%
    —
    90°66°+11°
  7. Friday
    Jul 10
    Overcast
    35%
    —
    89°72°-1°
Hamilton Square, NJ
Next 24 hours · Hot now
HOT 90°70°88°105°6p12a6a12pnow 97°high 97°low 74°PRECIP %
Hamilton Square, NJ
Anemometer · 24h winds · from true
NESW
From · True
SSW
210° · backing 60°
Direction
SSW
210°
Sustained
5
mph
Gust
14
mph
Peak 24h
19
avg 6
Beaufort · 2 · LIGHT 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 19 @ 4:00p
010203040MPHB1B2B3B4B5B6B7B8-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 413SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 60° from the ssw.
Hamilton Square, NJ
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1006.4
-1.4 mb in 3h · falling · 29.72 inHg
Now
1006.4
mb
3h
-1.4
mb
12h
-2.3
mb
24h
-2.5
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1006–1011
1000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR-21h-18h-15h-12h-9h-6h-3h-24hNOW1010.51006.51006.5
−24h−18h−12h−6hnow
Pressure giving way — clouds thicken and rain edges closer.
Hamilton Square, NJ
Air quality
105
AQI
Unhealthy for Sensitive Groups
↑+48 in 6h

AQI 105 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 48 in the last 6 hours — air quality is degrading. Ozone at AQI 81. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.

CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.

PM 2.5Good
5.2μg/m³
PM 10Good
5μg/m³
NO₂Good
4μg/m³
OzoneDRIVERUnhealthy SG
126μg/m³
UV IndexLow
0.3

What's driving it

Ozone × UV × Sky

Ozone at AQI 81. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.

Present
AQI 81
UV peak
0.2 at 1 PM
Sky at peak
overcast
Projected peak
AQI 10

PM × Wind × Precip

PM2.5 at 5.2 µg/m³ (AQI 29) with a 0.98 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.98
Wind
light
Recent rain
0h in last 6h
Pattern
stagnant smoke

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
Hamilton Square, NJ
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
112.7mi
UNLIMITED
115 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
23:19 UTC · Hamilton Square, 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
23:19 UTC · Hamilton Square, NJ · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Hamilton Square, NJ
Satellite · infrared · animated
Hamilton Square, NJ
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Hamilton Square, NJ
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:02 AM
Sunrise
1:34 AM
Daylight
14h 57m
Sunset
4:31 PM
Civil dusk
9:05 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Hamilton Square, NJ
The moon
Waning Gibbous
78% illuminated
Moonrise
10:52 PM
Moonset
10:02 AM
In sign
♓︎ Pisces
Hamilton Square, NJ
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Hamilton Square at a glance

  • Today vs. normal: 25°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.

16-Day Forecast — Hamilton Square

  1. Sat98°74°50%
  2. Sun88°72°53%
  3. Mon78°71°92%
  4. Tue75°66°90%
  5. Wed79°65°23%
  6. Thu90°66°11%
  7. Fri89°72°35%
  8. Sat88°73°37%
  9. Sun85°67°27%
  10. Mon79°67°23%
  11. Tue86°67°18%
  12. Wed89°63°35%
  13. Thu90°66°34%
  14. Fri95°73°35%
  15. Sat92°72°32%
  16. Sun90°73°43%

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

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 — Hamilton Square

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

  • TODAYSLGTSlight Risk
  • TOMORROWSLGTSlight 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

The year in Hamilton Square tops out in July (~77°F) and dips lowest in January (~31°F), with August wettest at 4.2 inches and October driest at 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

Hamilton Square's climate, from NOAA NCEI 1991-2020 station normals, pairs 31°F Januarys with 77°F Julys — a 46°F swing. About 44.4 inches of precipitation falls over roughly 173 days a year.

No season owns Hamilton Square's rain: August reaches 4.2 inches across 17.2 days and October keeps 3.0 inches on 10.6, an even spread through Hamilton Square's year. That even rhythm groups Hamilton Square with places like Mercerville, NJ, Yardville, NJ and White Horse, NJ.

The cool-season window in Hamilton Square starts at mid-April, when nights stop freezing — think peas, lettuce, spinach, and radishes. Warm-soil crops in Hamilton Square wait about two weeks past Hamilton Square's last frost, once the soil warms. It shuts near mid-November, when freezes return to Hamilton Square and tender plants need cover. In Hamilton Square, low spots run 4-7°F colder than nearby slopes, nudging Hamilton Square's frost dates a week.

Similar climates: Mercerville, NJ, Yardville, NJ, White Horse, NJ, Groveville, NJ, Windsor, NJ.

Frequently asked

When does it freeze in Hamilton Square?
Frost typically leaves Hamilton Square by mid-April and returns to Hamilton Square near mid-November.
What is the rainy season in Hamilton Square?
August is the wettest month in Hamilton Square, about 4.2 inches on average; the year totals roughly 44 inches.
What is the warmest month in Hamilton Square?
Hamilton Square peaks in July, when the mean runs near 77°F.
What is the coldest month in Hamilton Square?
January is Hamilton Square's coldest month, averaging about 31°F.
When can I start a vegetable garden in Hamilton Square?
Around mid-April, start frost-hardy crops in Hamilton Square; tomatoes and basil belong a fortnight later.
How many rainy days does Hamilton Square get?
Hamilton Square records around 173 days of measurable precipitation annually.
What hardiness zone is Hamilton Square?
Since January in Hamilton Square averages 31°F, Hamilton Square's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Hamilton Square?
Hamilton Square'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 Hamilton Square?
See this week's day-by-day rain chances for Hamilton Square in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Hamilton Square?
Current conditions for Hamilton Square and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Hamilton Square forecast updated?
The Hamilton Square forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Hamilton Square?
Today's sunrise and sunset times for Hamilton Square 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 Hamilton Square?
The next few days in Hamilton Square's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a warm-summer humid continental zone, Hamilton Square, New Jersey swings from 31°F in the heart of winter to 77°F at midsummer — a 46°F arc.

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

Hamilton Square's 46°F range, set by its 40.2°N position, drives frost timing and what thrives in Hamilton Square.

All cities in New Jersey →

Trenton, NJ weather →

ZIP codes in Hamilton Square

  • 08690
  • 08691

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.