Observed 12:55 AM EDT at KISP

East Islip, NY weather

Clear and 39°4°.

Forecasts agree

Now 39°4°

Clear

Wind: Calm; Light through 1 PM
Dew point: 37°3°; Comfortable
Humidity: 93%; Air 39°4°, dew point 37°3° · fog or dew likely
UV index: 0Low; Moderate 12–4 PM · peak 4
Air quality: 41Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.46 inHg1031 hPa; Rising slowly · +0.02 inHg+0.6 hPa next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 38°3° today at 6 AM
Above 50°10° today by 10 AM
High 61°16° today at 3 PM
Below 50°10° tonight after 9 PM

TonightDown to 39°4° by 5 AM · Clear
This morningUp to 57°14° by 11 AM · Mostly cloudy
This afternoonNear 60°16° · Partly cloudy
TonightDown to 39°4° by 5 AM · Clear
Tomorrow morningUp to 58°14° by 11 AM · Clear
Tomorrow afternoonUp to 64°18° by 2 PM · Clear
Tomorrow nightDown to 45°7° by midnight · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 1a	Mostly clear	43°6° (likely 42°6° to 48°9°)	43°6°	0%	2 mph3 km/h from NE, gusts 6 mph10 km/h	86%	9%	0
Sat 2a	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	2 mph3 km/h from NE, gusts 6 mph10 km/h	93%	8%	0
Sat 3a	Clear	42°6° (likely 40°4° to 48°9°)	42°6°	0%	2 mph3 km/h from NE, gusts 6 mph9 km/h	93%	11%	0
Sat 4a	Clear	41°5° (likely 40°4° to 48°9°)	41°5°	0%	3 mph5 km/h from NE, gusts 6 mph10 km/h	100%	10%	0
Sat 5a	Clear	39°4° (likely 39°4° to 47°8°)	39°4°	0%	3 mph5 km/h from NE, gusts 6 mph10 km/h	100%	11%	0
Sat 6a	Partly cloudy	38°3° (likely 38°3° to 47°8°)	38°3°	0%	3 mph5 km/h from NE, gusts 6 mph10 km/h	100%	26%	0
Sat 7a	Cloudy	39°4° (likely 37°3° to 46°8°)	39°4°	0%	3 mph5 km/h from N, gusts 8 mph12 km/h	100%	71%	0
Sat 8a	Cloudy	41°5° (likely 39°4° to 46°8°)	41°5°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	100%	79%	0
Sat 9a	Cloudy	48°9° (likely 47°8° to 48°9°)	48°9°	0%	3 mph5 km/h from N, gusts 8 mph12 km/h	86%	74%	1
Sat 10a	Cloudy	55°13° (likely 51°11° to 55°13°)	55°13°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	66%	76%	2
Sat 11a	Cloudy	57°14° (likely 54°12° to 57°14°)	57°14°	0%	3 mph5 km/h from N, gusts 5 mph9 km/h	59%	80%	2
Sat 12p	Cloudy	60°16° (likely 56°13° to 60°16°)	60°16°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	49%	80%	3
Sat 1p	Cloudy	58°14° (likely 58°14° to 60°16°)	58°14°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	51%	80%	4
Sat 2p	Cloudy	60°16° (likely 59°15° to 61°16°)	60°16°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	44%	71%	3
Sat 3p	Mostly sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	42%	35%	3
Sat 4p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	44%	30%	2
Sat 5p	Sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	46%	38%	1
Sat 6p	Mostly cloudy	56°13° (likely 55°13° to 56°13°)	56°13°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	55%	62%	0
Sat 7p	Partly cloudy	52°11° (likely 52°11° to 55°13°)	52°11°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	63%	38%	0
Sat 8p	Clear	50°10° (likely 50°10° to 53°12°)	50°10°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	68%	10%	0
Sat 9p	Clear	47°8° (likely 47°8° to 52°11°)	47°8°	0%	2 mph3 km/h from W, gusts 7 mph12 km/h	76%	4%	0
Sat 10p	Clear	46°8° (likely 46°8° to 52°11°)	46°8°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	79%	0%	0
Sat 11p	Clear	44°7° (likely 44°7° to 51°11°)	44°7°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	86%	0%	0
Sun 12a	Clear	43°6° (likely 43°6° to 50°10°)	43°6°	0%	2 mph3 km/h from NW, gusts 8 mph14 km/h	89%	0%	0
Sun 1a	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	2 mph3 km/h from NW, gusts 8 mph14 km/h	96%	0%	0
Sun 2a	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	2 mph3 km/h from NW, gusts 9 mph15 km/h	96%	0%	0
Sun 3a	Clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	2 mph3 km/h from NW, gusts 11 mph17 km/h	100%	0%	0
Sun 4a	Clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	2 mph3 km/h from NW, gusts 11 mph17 km/h	100%	0%	0
Sun 5a	Clear	39°4° (likely 39°4° to 47°8°)	39°4°	0%	2 mph3 km/h from NW, gusts 10 mph15 km/h	100%	0%	0
Sun 6a	Clear	38°3° (likely 38°3° to 47°8°)	38°3°	0%	2 mph3 km/h from NW, gusts 10 mph15 km/h	100%	0%	0
Sun 7a	Sunny	38°3° (likely 38°3° to 46°8°)	38°3°	0%	2 mph3 km/h from NW, gusts 10 mph16 km/h	100%	0%	0
Sun 8a	Sunny	40°4° (likely 40°4° to 47°8°)	40°4°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	100%	0%	0
Sun 9a	Sunny	48°9° (likely 47°8° to 50°10°)	48°9°	0%	2 mph3 km/h from NW, gusts 8 mph12 km/h	89%	0%	1
Sun 10a	Sunny	54°12° (likely 53°12° to 55°13°)	54°12°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	74%	0%	2
Sun 11a	Sunny	58°14° (likely 57°14° to 60°16°)	58°14°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	62%	0%	3
Sun 12p	Sunny	60°16° (likely 59°15° to 63°17°)	60°16°	0%	3 mph5 km/h from NW, gusts 7 mph10 km/h	55%	0%	4
Sun 1p	Sunny	62°17° (likely 61°16° to 64°18°)	62°17°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	48%	0%	4
Sun 2p	Sunny	64°18° (likely 62°17° to 64°18°)	64°18°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	43%	0%	4
Sun 3p	Sunny	64°18° (likely 61°16° to 65°18°)	64°18°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	43%	0%	3
Sun 4p	Sunny	63°17° (likely 60°16° to 64°18°)	63°17°	0%	3 mph5 km/h from SW, gusts 10 mph15 km/h	46%	0%	2
Sun 5p	Sunny	61°16° (likely 59°15° to 63°17°)	61°16°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	50%	0%	1
Sun 6p	Clear	58°14° (likely 56°13° to 59°15°)	58°14°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	57%	0%	0
Sun 7p	Clear	54°12° (likely 53°12° to 56°13°)	54°12°	0%	2 mph3 km/h from SW, gusts 8 mph13 km/h	66%	0%	0
Sun 8p	Clear	51°11° (likely 51°11° to 56°13°)	51°11°	0%	2 mph3 km/h from SW, gusts 8 mph13 km/h	77%	0%	0
Sun 9p	Clear	49°9° (likely 49°9° to 58°14°)	49°9°	0%	2 mph3 km/h from SW, gusts 8 mph12 km/h	83%	0%	0
Sun 10p	Clear	48°9° (likely 48°9° to 57°14°)	48°9°	0%	2 mph3 km/h from SW, gusts 8 mph12 km/h	86%	0%	0
Sun 11p	Clear	47°8° (likely 47°8° to 57°14°)	47°8°	0%	2 mph3 km/h from SW, gusts 7 mph12 km/h	89%	0%	0
Mon 12a	Clear	45°7° (likely 45°7° to 57°14°)	45°7°	0%	2 mph3 km/h from SW, gusts 8 mph13 km/h	96%	0%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Cloudy. High 61°16°, low 38°3°. Typical 61°16° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Official NWS forecast
Today: Patchy frost before 9am. Partly sunny, with a high near 61. Northwest wind around 3 mph.
Tonight: Partly cloudy, with a low around 38. Northeast wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
37°3°–46°8°
Typical high / low
61°16° / 44°7°
Wind
8 mph13 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 40°4°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny. High near 64, with temperatures falling to around 61 in the afternoon. West wind around 3 mph.
Night: Clear. Low around 40, with temperatures rising to around 42 overnight. Southwest wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
40°4°–46°8°
Typical high / low
61°16° / 44°7°
Wind
10 mph17 km/h, gusts 17 mph27 km/h
UV peak
4
Monday, Oct 26. Sunny. High 66°19°, low 49°9°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
44°7°–51°11°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 15 mph25 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 60°16°, low 42°6°. Typical 60°16° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 60.
Night: Mostly clear, with a low around 42.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
56°13°–60°16°
Low, likely
42°6°–52°11°
Typical high / low
60°16° / 43°6°
Wind
14 mph22 km/h, gusts 26 mph41 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 58°14°, low 47°8°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 58.
Night: Partly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–58°14°
Low, likely
42°6°–47°8°
Typical high / low
60°16° / 43°6°
Wind
11 mph17 km/h, gusts 17 mph27 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 64°18°, low 51°11°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 64.
Night: Partly cloudy, with a low around 51.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
58°14°–64°18°
Low, likely
48°9°–52°11°
Typical high / low
60°16° / 43°6°
Wind
11 mph18 km/h, gusts 30 mph49 km/h
UV peak
4
Friday, Oct 30. Sunny. High 66°19°, low 52°11°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 66.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–69°21°
Low, likely
50°10°–54°12°
Typical high / low
59°15° / 42°6°
Wind
9 mph15 km/h, gusts 24 mph38 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 64°18°, low 51°11°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
49°9°–55°13°
Typical high / low
59°15° / 42°6°
Wind
13 mph20 km/h, gusts 26 mph42 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 62°17°, low 52°11°. Typical 58°14° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 58°14°
  20% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–65°18°
Low, likely
49°9°–58°14°
Typical high / low
58°14° / 42°6°
Wind
13 mph21 km/h, gusts 24 mph38 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 62°17°, low 56°13°. Typical 58°14° / 42°6°. Rain 0.16 in4.1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 60°16°
  20% chance · 0.08 in2.1 mm
3. Evening
  6 PM–midnight
  Drizzle, 59°15°
  20% chance · 0.19 in4.9 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–68°20°
Low, likely
47°8°–61°16°
Typical high / low
58°14° / 42°6°
Wind
19 mph30 km/h, gusts 42 mph67 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 38°.
Tomorrow
Dry, high 64°, low 40°, warming up.
Monday
Dry, high 66°, low 49°.
Rest of week
Mostly dry, highs 58–66°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (OKX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Carlls River at Babylon

7.5 mi

Level: 0.5 ft
Flow: 15 cfs

Reading from Sat 12 AM · NWS gauge page

Great South Bay at Lindenhurst (IN MLLW)

9.7 mi

Below flood stage

Level: 2.3 ft

Reading from Fri 11 PM · NWS gauge page

Great South Bay at Watch Hill (IN MLLW)

11 mi

Below flood stage

Level: 2.3 ft

Reading from Fri 11 PM · NWS gauge page

Flax Pond at Old Field (IN MLLW)

17 mi

Below flood stage

Level: 7.7 ft

Reading from Fri 11:24 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 68% less heating than a typical week.

This week 30Typical 93

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 21
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 15 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 37°F).

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Islip-Li Macarthur Airport · official normals 1991–2020 · records 1963–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

On average 1°0° colder than normal (daily mean temperature).

−2°−1°SatOct 17
−6°−3°SunOct 18
−4°−2°MonOct 19
+3°+1°TueOct 20
+2°+1°WedOct 21
+4°+2°ThuOct 22
—FriOct 23

East Islip weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 45 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 30 min less
Golden hour: 5:21–6:16 PM; Morning 6:56–7:51 AM
Blue hour: 6:16–6:27 PM; Morning 6:45–6:56 AM; first light 6:45 AM

Stars tonight? Fair

Mostly clear 1:21–6 AM, but the moon is 96% lit and up.

Moon

Waxing gibbous

95% lit · growing

Today: sets 5:24 AM · rises 4:55 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from East Islip. Open water to the horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

East Islip, NY weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Carlls River at Babylon

Great South Bay at Lindenhurst (IN MLLW)

Great South Bay at Watch Hill (IN MLLW)

Flax Pond at Old Field (IN MLLW)

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon