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Shaded-relief atlas plate of Islip, New York: rivers, roads, the city limits and where the water drains.
NEW YORK · SUFFOLK COUNTY

Islip

18,418 people, 20 ft above sea level in Suffolk County.

20 ftElevation, city center
18,418People, 2024 estimate
5 sq miLand area
Mostly cloudy 69°
Mostly cloudy now Dew point 58° · N 10 mph · high 68°
City of Islip River Interstate 2 miles
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The Islip plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Islip

NWS forecast and National Blend of Models · updated 1:00 PM EDT
RIGHT NOW Long Island Mac Arthur Airport (KISP) · 1:56 PM
Mostly cloudy
69° Mostly cloudy Feels like 69° · high of 68° near 2 PM
WindN 10 mphno gusts
Humidity68%falling to 70% this afternoon
Pressure29.97 in →steady
Visibility10 mihaze-free
CloudsBrokenbases near 3,500 ft
UV index—no forecast
Dew point 58° · Comfortableabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Showers
Friday40% chance · showers
LIKELY AMOUNT—amounts come within 3 days
LAST RAINSept. 271.92 in · 2 dry days
ALERTS & OUTLOOKS
No watches or warnings for Suffolk County
NWS Upton and the Storm Prediction Center · checked 2:50 PM
SUN & MOON
↑ 6:47 AM6:39 PM ↓
11 h 52 m of daylight, 3 minutes less than yesterday
Waning gibbous, 89% lit. The Harvest Moon was full Saturday.
AIR & POLLEN
21
GOODAir quality index · ozone
Tomorrow: 41, good. No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
TUESDAY, SEPT. 29
WEDNESDAY, SEPT. 30
THURSDAY, OCT. 1
FRIDAY, OCT. 2
2p
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
partly cloudy day
mostly sunny
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
mostly sunny
mostly sunny
partly cloudy day
partly cloudy day
partly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy day
partly cloudy day
partly cloudy day
partly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy day
partly cloudy day
TEMPERATURE °F
68°
57°
71°
63°
72°
65°
CHANCE OF RAIN
50%
WIND, MPH
7
5
2
0
1
3
3
3
6
7
7
6
6
6
8
11
12
11
9
9
9
9
10
10
HOW IT FEELS · DEW POINT
Sticky: dew points 56 to 65°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 70° / 54°
TUE Sept. 29 Partly cloudy Partly cloudy
68° 57°
0% rain — NW 7 A
WED Sept. 30 Partly cloudy Partly cloudy
73° 61°
0% rain — SW 5 A
THU Oct. 1 Partly cloudy Partly cloudy
74° 64°
0% rain — SSW 10 A
FRI Oct. 2 Chance of showers Chance of showers
77° 61°
40% rain up to 0.1″ SW 12 A
SAT Oct. 3 Partly cloudy; cooler Partly cloudy; cooler
69° 55°
20% rain — ENE 8 B
SUN Oct. 4 Chance of showers Chance of showers
66° 54°
50% rain up to 1.3″ E 8 B
MON Oct. 5 Mostly sunny Mostly sunny
65° 48°
10% rain — NW 12 C
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Islip about 5,000 feet above the ground was over the North Atlantic three days ago, and over Ontario a day ago, about 1,430 miles back along its path. Near the ground the air came from a point about 710 miles to the northeast; at 10,000 feet, from the North Atlantic. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

MILE7
ON THE NETWORK

Around Islip on the Forecast Network

Neighboring plates

Hempstead NY · 22 MI 22 miles west New York NY · 38 MI 38 miles west Jersey City NJ · 45 MI 45 miles west Newark NJ · 50 MI 50 miles west Philadelphia PA · 113 MI 113 miles southwest Worcester MA · 129 MI 129 miles northeast
FORECASTCITY
Atlas plate of Islip, New York. Explore the plate
NEW YORK · SUFFOLK

Islip

18,418 people, 20 ft above sea level in Suffolk County.

20 ftElevation
18,418People
5 sq miLand
Mostly cloudy 69°
Mostly cloudyDew point 58°
1

Today in Islip

NEXT 15 HOURS
Now partly cloudy day 68° 1%
5p partly cloudy day 68° 1%
8p partly cloudy night 63° 1%
11p partly cloudy night 61° 0%
2a partly cloudy night 59° 1%
5a partly cloudy night 58° 0%
Showers
NEXT RAINFriday · 40%
→
Tue0%
Partly cloudy Partly cloudy
57
68
A
Wed0%
Partly cloudy Partly cloudy
61
73
A
Thu0%
Partly cloudy Partly cloudy
64
74
A
Fri40%
Chance of showers Chance of showers
61
77
A
Sat20%
Partly cloudy; cooler Partly cloudy; cooler
55
69
B
Sun50%
Chance of showers Chance of showers
54
66
B
Mon10%
Mostly sunny Mostly sunny
48
65
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
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