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

Mountainside, New Jersey Weather

Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →

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

Mountainside, NJ
Sunday, July 5 at 1:18 AM
73
°
Light Drizzle
Feels like
76°
Humidity
78%
Wind
7 mph
Sunrise
1:32 AM
Sunset
4:31 PM
Mountainside, NJ
Hour by hour · 24h
24-Hour ForecastMountainside, NJ: 24-hour forecast. Temperatures range from 72 to 85 degrees Fahrenheit with a 66% chance of precipitation at 12 AM.
L 72°H 85°
Mountainside, NJ
7-day forecast
  1. Today
    Jul 5
    Rain
    61%
    0.21″
    85°72°—
  2. Monday
    Jul 6
    Heavy Rain
    94%
    2.4″
    72°65°-13°
  3. Tuesday
    Jul 7
    Drizzle
    81%
    0.04″
    68°62°-4°
  4. Wednesday
    Jul 8
    Overcast
    33%
    —
    81°62°+13°
  5. Thursday
    Jul 9
    Light Drizzle
    18%
    —
    87°64°+6°
  6. Friday
    Jul 10
    Light Drizzle
    45%
    —
    90°70°+3°
  7. Saturday
    Jul 11
    Overcast
    30%
    —
    88°67°-2°
Mountainside, NJ
Next 24 hours · Mild now
68°78°88°12a6a12p6pnow 74°high 85°low 72°PRECIP %
Mountainside, NJ
Anemometer · 24h winds · from true
NESW
From · True
WSW
256° · backing 22°
Direction
WSW
256°
Sustained
7
mph
Gust
24
mph
Peak 24h
35
avg 9
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 9 · pk 35 @ 11:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 252SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 22° from the wsw.
Mountainside, NJ
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1005.4
+2.1 mb in 3h · rising rapidly · 29.69 inHg
Now
1005.4
mb
3h
+2.1
mb
12h
+2.2
mb
24h
+1.4
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1001–1006
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1005.71000.91005.6
−24h−18h−12h−6hnow
Pressure climbing out of the rain band — clearing edging in.
Mountainside, NJ
Air quality
45
AQI
Good
↓-52 in 6h

AQI 45 (Good), driven by PM2.5. AQI down 52 over the last 6 hours — air quality is improving sharply. PM scrubbed by 2 hours of recent rain — PM2.5 down to 6.0 µg/m³, PM10 to 6.2 µg/m³.

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

PM 2.5DRIVERGood
6.0μg/m³
PM 10Good
6μg/m³
NO₂Good
10μg/m³
OzoneModerate
70μg/m³
UV IndexLow
0.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 33. Overcast through the UV peak window (cloud cover ~93%) — afternoon ozone should stay flat.

Present
AQI 33
UV peak
3.3 at 1 PM
Sky at peak
overcast
Projected peak
AQI 7

PM × Wind × Precip

PM scrubbed by 2 hours of recent rain — PM2.5 down to 6.0 µg/m³, PM10 to 6.2 µg/m³.

PM2.5/PM10
0.97
Wind
light
Recent rain
2h in last 6h
Pattern
washed out

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 TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³640
Mountainside, NJ
Sky cover · visibility · 24h
Cloud cover
100%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
37.7mi
UNLIMITED
113 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
05:18 UTC · Mountainside, 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
05:18 UTC · Mountainside, NJ · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Mountainside, NJ
Satellite · infrared · animated
Mountainside, NJ
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Mountainside, NJ
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:00 AM
Sunrise
1:32 AM
Daylight
14h 59m
Sunset
4:31 PM
Civil dusk
9:05 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Mountainside, NJ
The moon
Waning Gibbous
76% illuminated
Moonrise
11:15 PM
Moonset
11:07 AM
In sign
♓︎ Pisces
Mountainside, NJ
Microseason
Jul 1–5

Cicadas claim the afternoon

fish
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Mountainside at a glance

  • Today vs. normal: 73°F — typical for the season
  • Last frost: April 20 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP code: 07092

15-Day Forecast — Mountainside

  1. Sun85°72°61%
  2. Mon72°65°94%
  3. Tue68°62°81%
  4. Wed81°62°33%
  5. Thu87°64°18%
  6. Fri90°70°45%
  7. Sat88°67°30%
  8. Sun81°63°23%
  9. Mon86°63°15%
  10. Tue89°65°19%
  11. Wed88°68°34%
  12. Thu89°69°34%
  13. Fri85°68°30%
  14. Sat83°68°26%
  15. Sun93°73°36%

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

Right now in the garden

Peak growing season

As of July 5, 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 — Mountainside

SPC has placed Mountainside 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 186 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

July is Mountainside's warmest stretch (~75°F) and January its coldest (~29°F); precipitation crests in December at 4.3 inches and ebbs in February to 3.0 inches.

MonthMean tempPrecipRainy days
January29°3.6″13
February31°3.0″13
March39°3.8″16
April51°4.1″17
May59°3.9″18
June69°3.9″17
July75°3.8″17
August74°4.2″17
September67°3.7″14
October57°3.3″12
November43°3.9″13
December34°4.3″13

Regional context

Mountainside swings from 29°F in January to 75°F in July (46°F) per NOAA NCEI 1991-2020 normals; precipitation in Mountainside runs about 45.4 inches on roughly 180 measurable days.

Mountainside's precipitation spreads evenly: December peaks at 4.3 inches on 13.2 wet days, while February holds 3.0 inches over 12.9 — no month dominates Mountainside's rain calendar. That even rhythm groups Mountainside with places like Westfield, NJ, Summit, NJ and New Providence, NJ.

Once Mountainside passes mid-April, overnight freezes fade and kale, peas, spinach, and parsnips can be sown. Mountainside's heat-lovers — tomatoes, peppers, squash — hold off until Mountainside's frost risk clears, 10-14 days on. Frost returns to Mountainside near mid-November, ending the tender-crop season. A creek-bottom lot in Mountainside can lag Mountainside's last frost 7-10 days behind a south slope.

Similar climates: Westfield, NJ, Summit, NJ, New Providence, NJ, Garwood, NJ, Springfield, NJ.

Frequently asked

When does it freeze in Mountainside?
Mountainside's last spring frost lands near mid-April, and in Mountainside the first fall frost follows around mid-November.
What is the rainy season in Mountainside?
Mountainside sees its heaviest rain in December (around 4.3 inches), part of roughly 45 inches a year.
What is the warmest month in Mountainside?
July is Mountainside's warmest month, averaging about 75°F.
What is the coldest month in Mountainside?
Mountainside bottoms out in January, with a mean near 29°F.
When can I start a vegetable garden in Mountainside?
Frost-hardy sowings begin at mid-April in Mountainside; warm-season starts follow two weeks on.
How many rainy days does Mountainside get?
Expect roughly 180 wet days a year in Mountainside.
What hardiness zone is Mountainside?
Mountainside's USDA zone comes from its January mean (29°F); enter the ZIP on the USDA lookup for the number.
What is the 10-day forecast for Mountainside?
Mountainside'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 Mountainside?
See this week's day-by-day rain chances for Mountainside in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Mountainside?
Current conditions for Mountainside and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Mountainside forecast updated?
The Mountainside forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Mountainside?
Today's sunrise and sunset times for Mountainside 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 Mountainside?
The next few days in Mountainside's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Mountainside's warm-summer humid continental climate in New Jersey pairs 29°F Januarys with 75°F Julys, 46°F apart across the seasons.

Yearly precipitation in Mountainside totals around 45 inches, spread over about 180 days of rain or snow.

At 40.7°N, Mountainside's 46°F summer-to-winter swing sets when Mountainside's gardens wake and when frost returns.

Beaches near Mountainside

Each linked page shows live water temperature, wave height, swim and surf verdicts, tides, and rip-current risk from NDBC + NOAA + NWS data.

All cities in New Jersey →

Plainfield, NJ weather →

ZIP codes in Mountainside

  • 07092

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.