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South Valley Stream, New York Weather

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

South Valley Stream weather forecast — hour by hour, 7-day outlook, NOAA radar

South Valley Stream, NY
Saturday, July 4 at 4:07 PM
97
°
Clear
Feels like
100°
Humidity
35%
Wind
11 mph
Sunrise
1:29 AM
Sunset
4:29 PM
South Valley Stream, NY
Hour by hour · 24h
24-Hour ForecastSouth Valley Stream, NY: 24-hour forecast. Temperatures range from 73 to 98 degrees Fahrenheit with a 41% chance of precipitation at 12 AM.
L 73°H 98°
South Valley Stream, NY
7-day forecast
  1. Today
    Jul 4
    Rain
    39%
    0.12″
    98°75°—
  2. Sunday
    Jul 5
    Heavy Rain
    50%
    0.85″
    87°71°-11°
  3. Monday
    Jul 6
    Light Showers
    89%
    0.07″
    73°71°-14°
  4. Tuesday
    Jul 7
    Light Drizzle
    79%
    0.02″
    72°65°-1°
  5. Wednesday
    Jul 8
    Overcast
    18%
    —
    82°64°+10°
  6. Thursday
    Jul 9
    Overcast
    10%
    —
    88°72°+6°
  7. Friday
    Jul 10
    Overcast
    42%
    —
    92°77°+4°
South Valley Stream, NY
Next 24 hours · Hot now
HOT 90°65°85°105°12p6p12a6anow 97°high 98°low 73°PRECIP %
South Valley Stream, NY
Anemometer · 24h winds · from true
NESW
From · True
W
275° · veering 57°
Direction
W
275°
Sustained
11
mph
Gust
15
mph
Peak 24h
24
avg 7
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 7 · pk 24 @ 9:00p
0102030MPHB1B2B3B4B5B6B7-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 299SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 57° from the w.
South Valley Stream, NY
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1011.0
-0.4 mb in 3h · steady · 29.85 inHg
Now
1011.0
mb
3h
-0.4
mb
12h
-0.6
mb
24h
-0.1
mb
Regime · CHANGE
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1011–1013
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1012.51010.51011.0
−24h−18h−12h−6hnow
Air sits at the threshold — small shifts decide the day.
South Valley Stream, NY
Air quality
109
AQI
Unhealthy for Sensitive Groups
↑+50 in 6h▲Peak ~152 @ 11 PM

AQI 109 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 50 in the last 6 hours — air quality is degrading. Ozone at AQI 166 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

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

PM 2.5Moderate
16.5μg/m³
PM 10Good
19μg/m³
NO₂Good
5μg/m³
OzoneDRIVERUnhealthy
180μg/m³
UV IndexModerate
4.3

What's driving it

Ozone × UV × Sky

Ozone at AQI 166 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

Present
AQI 166
UV peak
3.9 at earlier today
Sky at peak
clear
Projected peak
AQI 166

PM × Wind × Precip

PM2.5 at 16.5 µg/m³, PM10 at 19.0 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.87
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/m³740
South Valley Stream, NY
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
102.7mi
UNLIMITED
104 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
20:07 UTC · South Valley Stream, NY · 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
20:07 UTC · South Valley Stream, NY · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
South Valley Stream, NY
Satellite · infrared · animated
South Valley Stream, NY
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
South Valley Stream, NY
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
4:57 AM
Sunrise
1:29 AM
Daylight
15h 00m
Sunset
4:29 PM
Civil dusk
9:03 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
South Valley Stream, NY
The moon
Waning Gibbous
79% illuminated
Moonrise
10:49 PM
Moonset
9:57 AM
In sign
♓︎ Pisces
South Valley Stream, NY
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

South Valley Stream at a glance

  • Today vs. normal: 26°F above the seasonal normal for this latitude
  • Last frost: April 20 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — South Valley Stream

  1. Sat98°75°39%
  2. Sun87°71°50%
  3. Mon73°71°89%
  4. Tue72°65°79%
  5. Wed82°64°18%
  6. Thu88°72°10%
  7. Fri92°77°42%
  8. Sat91°78°39%
  9. Sun87°74°22%
  10. Mon77°68°19%
  11. Tue82°70°23%
  12. Wed87°70°25%
  13. Thu94°74°45%
  14. Fri94°76°42%
  15. Sat93°77°35%
  16. Sun93°79°42%

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 — South Valley Stream

SPC has placed South Valley Stream 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

South Valley Stream peaks at about 76°F in July and bottoms near 31°F in January; December brings the heaviest rain (4.3 inches) and February the least (3.0 inches).

MonthMean tempPrecipRainy days
January31°3.6″13
February33°3.0″13
March40°3.8″15
April50°4.0″17
May59°3.8″18
June69°3.6″16
July76°3.3″16
August75°4.0″17
September69°3.4″13
October58°3.3″11
November45°4.0″13
December36°4.3″13

Regional context

In South Valley Stream, NOAA NCEI 1991-2020 normals put January near 31°F and July near 76°F — a 44°F seasonal arc — with about 44 inches of precipitation over 175 rainy or snowy days.

No season owns South Valley Stream's rain: December reaches 4.3 inches across 13.4 days and February keeps 3.0 inches on 12.8, an even spread through South Valley Stream's year. It is a balanced pattern South Valley Stream shares with places like Valley Stream, NY, Woodmere, NY and Hewlett, NY.

Around mid-April, South Valley Stream sheds its freezing nights — peas, lettuce, spinach, and radishes go into South Valley Stream's beds. Heat-demanding starts go out a fortnight on in South Valley Stream, after the soil warms and cold snaps clear. The season ends by mid-November in South Valley Stream, once hard frosts set back in. A creek-bottom lot in South Valley Stream can lag South Valley Stream's last frost 7-10 days behind a south slope.

Similar climates: Valley Stream, NY, Woodmere, NY, Hewlett, NY, Hewlett Bay Park, NY, North Valley Stream, NY.

Frequently asked

When does it freeze in South Valley Stream?
Frost typically leaves South Valley Stream by mid-April and returns to South Valley Stream near mid-November.
What is the rainy season in South Valley Stream?
Rainfall in South Valley Stream peaks in December near 4.3 inches, out of about 44 inches annually.
What is the warmest month in South Valley Stream?
On average July tops the year in South Valley Stream at about 76°F.
What is the coldest month in South Valley Stream?
The coldest stretch in South Valley Stream falls in January, around 31°F on average.
When can I start a vegetable garden in South Valley Stream?
Hardy spring crops go in near mid-April in South Valley Stream; tender peppers and squash wait 10–14 days.
How many rainy days does South Valley Stream get?
South Valley Stream averages about 175 days with measurable rain or snow each year.
What hardiness zone is South Valley Stream?
With January around 31°F, South Valley Stream's zone reflects that minimum — the USDA ZIP map confirms South Valley Stream's band.
What is the 10-day forecast for South Valley Stream?
South Valley Stream'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 South Valley Stream?
See this week's day-by-day rain chances for South Valley Stream in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in South Valley Stream?
Current conditions for South Valley Stream and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the South Valley Stream forecast updated?
The South Valley Stream forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in South Valley Stream?
Today's sunrise and sunset times for South Valley Stream 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 South Valley Stream?
The next few days in South Valley Stream'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, South Valley Stream, New York swings from 31°F in the heart of winter to 76°F at midsummer — a 45°F arc.

Rain and snow bring South Valley Stream roughly 44 inches a year across approximately 175 measurable-precipitation days.

South Valley Stream sits at 40.7°N; that 45°F seasonal swing frames planting windows and frost dates across South Valley Stream.

Beaches near South Valley Stream

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 York →

Queens, NY weather →

ZIP codes in South Valley Stream

  • 11581

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.