Observed 5:00 AM EDT at KISP

Islip, NY weather

Clear and 37°3°.

Forecasts agree

Now 37°3°

Clear

Wind: 3 mph5 km/h; From the north-northwest. 35–5 mph8 km/h through 5 PM
Dew point: 36°2°; Comfortable
Humidity: 93%; Air 37°3°, dew point 36°2° · fog or dew likely
UV index: 0Low; Moderate 12–2 PM · peak 3
Air quality: 44Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.49 inHg1033 hPa; Rising slowly · +0.03 inHg+0.9 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 39°4° today at 6 AM
Above 50°10° today by 10 AM
High 60°16° today at 2 PM
Below 50°10° tonight after 9 PM

This morningUp to 56°13° by 11 AM · Partly cloudy
This afternoonNear 59°15° · Partly cloudy
TonightDown to 42°6° by 4 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 63°17° by 4 PM · Clear
Tomorrow nightDown to 46°8° by 4 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 5a	Clear	40°4° (likely 38°3° to 47°8°)	40°4°	0%	3 mph5 km/h from N, gusts 10 mph17 km/h	100%	12%	0
Sat 6a	Partly cloudy	39°4° (likely 39°4° to 47°8°)	39°4°	0%	3 mph5 km/h from N, gusts 11 mph18 km/h	100%	20%	0
Sat 7a	Sunny	40°4° (likely 39°4° to 47°8°)	40°4°	0%	3 mph5 km/h from N, gusts 11 mph17 km/h	100%	35%	0
Sat 8a	Sunny	40°4° (likely 40°4° to 47°8°)	40°4°	0%	3 mph5 km/h from N, gusts 10 mph16 km/h	100%	42%	0
Sat 9a	Cloudy	46°8° (likely 46°8° to 50°10°)	46°8°	0%	3 mph5 km/h from N, gusts 9 mph15 km/h	89%	73%	0
Sat 10a	Cloudy	52°11° (likely 50°10° to 53°12°)	52°11°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	71%	80%	1
Sat 11a	Cloudy	56°13° (likely 53°12° to 56°13°)	56°13°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	59%	80%	2
Sat 12p	Mostly cloudy	59°15° (likely 56°13° to 59°15°)	59°15°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	49%	69%	3
Sat 1p	Cloudy	59°15° (likely 57°14° to 60°16°)	59°15°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	47%	67%	3
Sat 2p	Cloudy	60°16° (likely 59°15° to 61°16°)	60°16°	0%	5 mph8 km/h from NW, gusts 7 mph12 km/h	44%	61%	2
Sat 3p	Mostly cloudy	60°16° (likely 59°15° to 61°16°)	60°16°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	44%	46%	2
Sat 4p	Partly sunny	59°15° (likely 59°15° to 61°16°)	59°15°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	45%	37%	1
Sat 5p	Partly sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	5 mph8 km/h from W, gusts 8 mph12 km/h	47%	35%	0
Sat 6p	Mostly clear	56°13° (likely 54°12° to 57°14°)	56°13°	0%	3 mph5 km/h from SW, gusts 6 mph9 km/h	53%	43%	0
Sat 7p	Mostly clear	52°11° (likely 50°10° to 55°13°)	52°11°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	59%	26%	0
Sat 8p	Clear	50°10° (likely 48°9° to 54°12°)	50°10°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	63%	6%	0
Sat 9p	Clear	49°9° (likely 46°8° to 53°12°)	49°9°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	68%	2%	0
Sat 10p	Clear	47°8° (likely 45°7° to 52°11°)	47°8°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	74%	1%	0
Sat 11p	Clear	46°8° (likely 44°7° to 51°11°)	46°8°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	76%	1%	0
Sun 12a	Clear	45°7° (likely 43°6° to 50°10°)	45°7°	0%	2 mph3 km/h from NW, gusts 8 mph14 km/h	82%	1%	0
Sun 1a	Clear	45°7° (likely 43°6° to 49°9°)	45°7°	0%	2 mph3 km/h from NW, gusts 9 mph15 km/h	82%	1%	0
Sun 2a	Clear	43°6° (likely 42°6° to 49°9°)	43°6°	0%	2 mph3 km/h from NW, gusts 10 mph16 km/h	93%	1%	0
Sun 3a	Clear	43°6° (likely 41°5° to 48°9°)	43°6°	0%	2 mph3 km/h from NW, gusts 10 mph16 km/h	93%	0%	0
Sun 4a	Clear	42°6° (likely 41°5° to 48°9°)	42°6°	0%	3 mph5 km/h from NW, gusts 10 mph15 km/h	96%	0%	0
Sun 5a	Clear	42°6° (likely 40°4° to 47°8°)	42°6°	0%	3 mph5 km/h from NW, gusts 8 mph14 km/h	93%	0%	0
Sun 6a	Clear	41°5° (likely 38°3° to 47°8°)	41°5°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	89%	0%	0
Sun 7a	Sunny	41°5° (likely 37°3° to 46°8°)	41°5°	0%	2 mph3 km/h from NW, gusts 6 mph9 km/h	89%	0%	0
Sun 8a	Sunny	43°6° (likely 37°3° to 47°8°)	43°6°	0%	3 mph5 km/h from NW, gusts 6 mph9 km/h	86%	2%	0
Sun 9a	Sunny	48°9° (likely 45°7° to 50°10°)	48°9°	0%	3 mph5 km/h from NW, gusts 5 mph8 km/h	77%	0%	1
Sun 10a	Sunny	54°12° (likely 53°12° to 55°13°)	54°12°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	64%	0%	2
Sun 11a	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	3 mph5 km/h from NW, gusts 6 mph9 km/h	57%	0%	3
Sun 12p	Sunny	59°15° (likely 59°15° to 62°17°)	59°15°	0%	3 mph5 km/h from NW, gusts 6 mph9 km/h	51%	0%	4
Sun 1p	Sunny	62°17° (likely 61°16° to 64°18°)	62°17°	0%	3 mph5 km/h from NW, gusts 5 mph8 km/h	46%	0%	4
Sun 2p	Sunny	62°17° (likely 62°17° to 65°18°)	62°17°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	44%	0%	4
Sun 3p	Sunny	62°17° (likely 61°16° to 64°18°)	62°17°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	44%	0%	3
Sun 4p	Sunny	63°17° (likely 60°16° to 64°18°)	63°17°	0%	5 mph8 km/h from SW, gusts 8 mph13 km/h	44%	0%	2
Sun 5p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	46%	0%	1
Sun 6p	Clear	59°15° (likely 54°12° to 59°15°)	59°15°	0%	5 mph8 km/h from SW, gusts 9 mph14 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 9 mph15 km/h	59%	0%	0
Sun 8p	Clear	53°12° (likely 51°11° to 55°13°)	53°12°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	69%	0%	0
Sun 9p	Clear	52°11° (likely 49°9° to 54°12°)	52°11°	0%	3 mph5 km/h from SW, gusts 9 mph14 km/h	71%	0%	0
Sun 10p	Clear	51°11° (likely 46°8° to 53°12°)	51°11°	0%	3 mph5 km/h from SW, gusts 10 mph16 km/h	74%	0%	0
Sun 11p	Clear	50°10° (likely 45°7° to 52°11°)	50°10°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	80%	0%	0
Mon 12a	Clear	49°9° (likely 46°8° to 51°11°)	49°9°	0%	3 mph5 km/h from W, gusts 10 mph15 km/h	80%	0%	0
Mon 1a	Clear	49°9° (likely 45°7° to 51°11°)	47°8°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	80%	0%	0
Mon 2a	Clear	48°9° (likely 44°7° to 51°11°)	46°8°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	80%	0%	0
Mon 3a	Clear	47°8° (likely 46°8° to 55°13°)	45°7°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	79%	0%	0
Mon 4a	Clear	46°8° (likely 46°8° to 54°12°)	44°7°	0%	5 mph8 km/h from W, gusts 10 mph15 km/h	83%	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, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Mostly cloudy, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Official NWS forecast
Today: Patchy frost before 9am. Partly sunny. High near 61, with temperatures falling to around 59 in the afternoon. Northwest wind around 5 mph.
Tonight: Patchy frost. Partly cloudy. Low around 38, with temperatures rising to around 40 overnight. North wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–61°16°
Low, likely
38°3°–47°8°
Typical high / low
61°16° / 44°7°
Wind
7 mph12 km/h, gusts 16 mph26 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 42°6°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Official NWS forecast
Day: Sunny. High near 64, with temperatures falling to around 62 in the afternoon. Northwest wind around 5 mph.
Night: Clear. Low around 42, with temperatures rising to around 45 overnight. West wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
37°3°–46°8°
Typical high / low
61°16° / 44°7°
Wind
8 mph13 km/h, gusts 14 mph23 km/h
UV peak
4
Monday, Oct 26. Sunny. High 67°19°, low 46°8°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°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. High near 67, with temperatures falling to around 65 in the afternoon.
Night: Clear, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
45°7°–49°9°
Typical high / low
61°16° / 44°7°
Wind
10 mph16 km/h, gusts 16 mph26 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 57°14°, low 40°4°. 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°11°
  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 57.
Night: Mostly clear, with a low around 40.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
57°14°–59°15°
Low, likely
40°4°–51°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
  Cloudy, 56°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 58.
Night: Mostly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–59°15°
Low, likely
43°6°–47°8°
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 64°18°, low 52°11°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°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 52.
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 mph17 km/h, gusts 30 mph49 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 66°19°, low 53°12°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  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
66°19°–71°22°
Low, likely
52°11°–54°12°
Typical high / low
59°15° / 42°6°
Wind
11 mph17 km/h, gusts 26 mph42 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 65°18°, low 53°12°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  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
60°16°–71°22°
Low, likely
50°10°–54°12°
Typical high / low
59°15° / 42°6°
Wind
12 mph20 km/h, gusts 25 mph40 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 63°17°, low 55°13°. Typical 58°14° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 59°15°
  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
56°13°–68°20°
Low, likely
49°9°–57°14°
Typical high / low
58°14° / 42°6°
Wind
10 mph16 km/h, gusts 19 mph31 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 63°17°, low 59°15°. Typical 58°14° / 42°6°. Rain 0.04 in1 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 61°16°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  20% chance
3. Evening
  6 PM–midnight
  Mostly clear, 61°16°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–65°18°
Low, likely
56°13°–61°16°
Typical high / low
58°14° / 42°6°
Wind
12 mph19 km/h, gusts 18 mph29 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 38°.
Tomorrow
Dry, high 64°, low 42°, warming up.
Monday
Dry, high 67°, low 46°, warming up.
Rest of week
Mostly dry, highs 57–66°.

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

6.1 mi

Level: 0.5 ft
Flow: 15 cfs

Reading from Sat 4 AM · NWS gauge page

Great South Bay at Lindenhurst (IN MLLW)

8.5 mi

Below flood stage

Level: 1.6 ft

Reading from Sat 4 AM · NWS gauge page

Great South Bay at Watch Hill (IN MLLW)

12 mi

Below flood stage

Level: 1.2 ft

Reading from Sat 4 AM · NWS gauge page

Flax Pond at Old Field (IN MLLW)

17 mi

Below flood stage

Level: 4.5 ft

Reading from Sat 3:24 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: 17
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 7 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Today, 2:00 PM–3:00 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 0° 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
—FriOct 23
—SatOct 24

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 6:56–7:52 AM
Blue hour: 6:16–6:27 PM; Morning 6:46–6:56 AM; first light 6:46 AM

Stars tonight? Good

Mostly clear 5:28–6:46 AM; moon 96% lit but below the horizon.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:24 AM · rises 4:56 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from Islip. The highest point on the skyline is about 800 ft, 2 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

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? Good

Moon