Observed 9:55 AM EDT at KISP

Head of the Harbor, NY weather

Overcast and 52°11°, jacket by 7 PM.

Forecasts agree

Now 52°11°

Cloudy

Wind: 8 mph13 km/h; From the north-northeast. Up to 8 mph13 km/h through 10 PM
Dew point: 41°5°; Comfortable
UV index: 2Low; Moderate 11 AM–4 PM · peak 4
Air today: 50Good; EPA forecast · PM2.5 (fine particles)
Pressure: 30.55 inHg1035 hPa; Rising slowly · +0.04 inHg+1.3 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

High 60°16° today at 3 PM
Below 50°10° tonight after 9 PM
Low 42°6° tonight at 5 AM
Above 50°10° tomorrow by 10 AM

This morningNear 55°13° · Mostly cloudy
This afternoonNear 59°15° · Mostly cloudy
TonightDown to 42°6° by 5 AM · Clear
Tomorrow morningUp to 55°13° by 11 AM · Clear
Tomorrow afternoonUp to 62°17° by 4 PM · Clear
Tomorrow nightDown to 46°8° by 4 AM · Clear
Monday morningUp to 49°9° by 9 AM · 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 10a	Cloudy	53°12° (likely 49°9° to 53°12°)	53°12°	0%	5 mph8 km/h from N, gusts 9 mph14 km/h	64%	76%	2
Sat 11a	Cloudy	56°13° (likely 52°11° to 56°13°)	56°13°	0%	3 mph5 km/h from N, gusts 8 mph12 km/h	55%	80%	3
Sat 12p	Cloudy	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from N, gusts 7 mph11 km/h	49%	80%	3
Sat 1p	Cloudy	57°14° (likely 55°13° to 57°14°)	57°14°	0%	5 mph8 km/h from NW, gusts 7 mph11 km/h	49%	80%	4
Sat 2p	Cloudy	59°15° (likely 57°14° to 59°15°)	59°15°	0%	5 mph8 km/h from NW, gusts 8 mph12 km/h	44%	77%	3
Sat 3p	Cloudy	60°16° (likely 58°14° to 60°16°)	60°16°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	41%	67%	3
Sat 4p	Cloudy	60°16° (likely 58°14° to 60°16°)	60°16°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	42%	65%	2
Sat 5p	Cloudy	60°16° (likely 57°14° to 60°16°)	60°16°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	44%	65%	1
Sat 6p	Mostly clear	57°14° (likely 54°12° to 57°14°)	57°14°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	49%	60%	0
Sat 7p	Mostly clear	53°12° (likely 52°11° to 53°12°)	53°12°	0%	2 mph3 km/h from SW, gusts 7 mph10 km/h	54%	52%	0
Sat 8p	Mostly clear	52°11° (likely 50°10° to 52°11°)	52°11°	0%	2 mph3 km/h from SW, gusts 6 mph10 km/h	56%	43%	0
Sat 9p	Clear	49°9° (likely 49°9° to 50°10°)	49°9°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	68%	32%	0
Sat 10p	Clear	49°9° (likely 47°8° to 49°9°)	49°9°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	68%	12%	0
Sat 11p	Clear	48°9° (likely 45°7° to 48°9°)	48°9°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	68%	0%	0
Sun 12a	Clear	46°8° (likely 44°7° to 47°8°)	46°8°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	73%	0%	0
Sun 1a	Clear	46°8° (likely 44°7° to 46°8°)	46°8°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	76%	0%	0
Sun 2a	Clear	45°7° (likely 43°6° to 46°8°)	45°7°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	82%	0%	0
Sun 3a	Clear	44°7° (likely 43°6° to 46°8°)	44°7°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	86%	0%	0
Sun 4a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	89%	0%	0
Sun 5a	Clear	42°6° (likely 42°6° to 47°8°)	42°6°	0%	2 mph3 km/h from NW, gusts 8 mph12 km/h	93%	0%	0
Sun 6a	Clear	42°6° (likely 42°6° to 47°8°)	42°6°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	89%	1%	0
Sun 7a	Sunny	43°6° (likely 42°6° to 46°8°)	43°6°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	82%	1%	0
Sun 8a	Sunny	44°7° (likely 44°7° to 46°8°)	44°7°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	82%	1%	0
Sun 9a	Sunny	48°9° (likely 47°8° to 49°9°)	48°9°	0%	3 mph5 km/h from NW, gusts 5 mph8 km/h	77%	1%	1
Sun 10a	Sunny	52°11° (likely 52°11° to 55°13°)	52°11°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	66%	0%	2
Sun 11a	Sunny	55°13° (likely 55°13° to 58°14°)	55°13°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	59%	0%	3
Sun 12p	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	55%	0%	4
Sun 1p	Sunny	60°16° (likely 60°16° to 62°17°)	60°16°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	47%	0%	4
Sun 2p	Sunny	61°16° (likely 61°16° to 63°17°)	61°16°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	46%	0%	4
Sun 3p	Sunny	61°16° (likely 61°16° to 63°17°)	61°16°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	44%	0%	3
Sun 4p	Sunny	62°17° (likely 62°17° to 63°17°)	62°17°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	43%	0%	2
Sun 5p	Sunny	61°16° (likely 60°16° to 62°17°)	61°16°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	44%	0%	1
Sun 6p	Clear	58°14° (likely 55°13° to 58°14°)	58°14°	0%	3 mph5 km/h from SW, gusts 3 mph5 km/h	51%	0%	0
Sun 7p	Clear	56°13° (likely 52°11° to 56°13°)	56°13°	0%	3 mph5 km/h from SW, gusts 7 mph12 km/h	57%	0%	0
Sun 8p	Clear	51°11° (likely 50°10° to 53°12°)	51°11°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	71%	0%	0
Sun 9p	Clear	50°10° (likely 48°9° to 52°11°)	50°10°	0%	3 mph5 km/h from SW, gusts 12 mph20 km/h	74%	0%	0
Sun 10p	Clear	49°9° (likely 47°8° to 51°11°)	49°9°	0%	3 mph5 km/h from SW, gusts 11 mph18 km/h	77%	0%	0
Sun 11p	Clear	49°9° (likely 47°8° to 51°11°)	49°9°	0%	3 mph5 km/h from SW, gusts 11 mph18 km/h	77%	0%	0
Mon 12a	Clear	49°9° (likely 46°8° to 50°10°)	49°9°	0%	3 mph5 km/h from W, gusts 11 mph18 km/h	77%	0%	0
Mon 1a	Clear	48°9° (likely 46°8° to 49°9°)	46°8°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	80%	0%	0
Mon 2a	Clear	48°9° (likely 45°7° to 48°9°)	46°8°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	80%	0%	0
Mon 3a	Clear	47°8° (likely 45°7° to 47°8°)	45°7°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	83%	0%	0
Mon 4a	Clear	46°8° (likely 45°7° to 46°8°)	44°7°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	83%	0%	0
Mon 5a	Clear	46°8° (likely 44°7° to 46°8°)	44°7°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	83%	0%	0
Mon 6a	Clear	45°7° (likely 44°7° to 46°8°)	43°6°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	86%	0%	0
Mon 7a	Sunny	45°7° (likely 44°7° to 47°8°)	43°6°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	86%	1%	0
Mon 8a	Sunny	46°8° (likely 45°7° to 49°9°)	44°7°	0%	5 mph8 km/h from W, gusts 10 mph17 km/h	86%	9%	0
Mon 9a	Sunny	49°9° (likely 49°9° to 54°12°)	47°8°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	77%	12%	1

Days ahead

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

Today, Oct 24. Cloudy. High 60°16°, low 41°5°. Typical 61°16° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Official NWS forecast
Today: Partly sunny, with a high near 60. Northwest wind around 5 mph.
Tonight: Mostly clear, with a low around 41. West wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
58°14°–60°16°
Low, likely
40°4°–43°6°
Typical high / low
61°16° / 44°7°
Wind
7 mph11 km/h, gusts 13 mph22 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 43°6°. Typical 61°16° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Official NWS forecast
Day: Sunny. High near 63, with temperatures falling to around 61 in the afternoon. Northwest wind around 3 mph.
Night: Clear. Low around 43, with temperatures rising to around 46 overnight. Southwest wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–63°17°
Low, likely
42°6°–44°7°
Typical high / low
61°16° / 44°7°
Wind
7 mph12 km/h, gusts 18 mph29 km/h
UV peak
4
Monday, Oct 26. Sunny. High 65°18°, low 47°8°. Typical 61°16° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 65. West wind around 7 mph.
Night: Clear. Low around 47, with temperatures rising to around 49 overnight.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–65°18°
Low, likely
44°7°–47°8°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 18 mph29 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 56°13°, low 41°5°. Typical 60°16° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 56.
Night: Mostly clear, with a low around 41.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
56°13°–59°15°
Low, likely
41°5°–51°11°
Typical high / low
60°16° / 43°6°
Wind
14 mph23 km/h, gusts 25 mph41 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 56°13°, low 47°8°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 49°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 56.
Night: Partly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–57°14°
Low, likely
40°4°–48°9°
Typical high / low
60°16° / 43°6°
Wind
9 mph15 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 63°17°, low 52°11°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°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 63.
Night: Partly cloudy, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
47°8°–52°11°
Typical high / low
60°16° / 43°6°
Wind
10 mph16 km/h, gusts 30 mph49 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 65°18°, low 48°9°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–70°21°
Low, likely
48°9°–54°12°
Typical high / low
59°15° / 42°6°
Wind
15 mph25 km/h, gusts 25 mph41 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 64°18°, low 52°11°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–68°20°
Low, likely
49°9°–54°12°
Typical high / low
59°15° / 42°6°
Wind
19 mph30 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 63°17°, low 54°12°. Typical 58°14° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 56°13°
  30% 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
54°12°–66°19°
Low, likely
47°8°–57°14°
Typical high / low
58°14° / 42°6°
Wind
16 mph26 km/h, gusts 23 mph37 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 62°17°, low 56°13°. Typical 58°14° / 42°6°. Rain 0.08 in2 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 57°14°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  30% 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
54°12°–67°19°
Low, likely
48°9°–60°16°
Typical high / low
58°14° / 42°6°
Wind
15 mph24 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 60°, low 41°.
Tomorrow
Dry, high 63°, low 43°, warming up.
Monday
Dry, high 65°, low 47°.
Rest of week
Mostly dry, highs 56–65°.

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

Great South Bay at Lindenhurst (IN MLLW)

19 mi

Action stage

Level: 2.9 ft

Reading from Sat 9 AM · NWS gauge page

Long Island Sound near Bridgeport Harbor (IN MLLW)

19 mi

Below flood stage

Level: 8.0 ft

Forecast peak 9.1 ft Tue 12 PM

Reading from Sat 9:06 AM · NWS gauge page

Flax Pond at Old Field (IN MLLW)

4.6 mi

Below flood stage

Level: 5.8 ft

Reading from Sat 8:24 AM · NWS gauge page

Carlls River at Babylon

16 mi

Level: 0.5 ft
Flow: 15 cfs

Reading from Sat 9 AM · NWS gauge page

For your home

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

Heating this week

About 71% less heating than a typical week.

This week 27Typical 93

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 15
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 2 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 41°F).

Open the windows?

Today, 3:00 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° colder than normal (daily mean temperature).

−6°−3°SunOct 18
−4°−2°MonOct 19
+3°+1°TueOct 20
+2°+1°WedOct 21
+4°+2°ThuOct 22
−4°−2°FriOct 23
—SatOct 24

Head of the Harbor 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 31 min less
Golden hour: 5:20–6:16 PM; Morning 6:56–7:52 AM
Blue hour: 6:16–6:26 PM; Morning 6:46–6:56 AM; first light 6:46 AM

Stars tonight? Fair

Mostly clear 10 PM–6:47 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

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

Looking north from Head of the Harbor. The highest point on the skyline is about 900 ft, 16 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.