Observed 7:40 AM EDT at KISP

Setauket, NY weather

Sunny and 41°5°.

Forecasts agree

Now 41°5°

Sunny

Wind: Calm; Up to 5 mph8 km/h through 7 PM
Dew point: 37°3°; Comfortable
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air today: 50Good; EPA forecast · PM2.5 (fine particles)
Pressure: 30.51 inHg1033 hPa; Rising slowly · +0.04 inHg+1.2 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 50°10° today by 10 AM
High 60°16° today at 4 PM

This morningUp to 55°13° by 11 AM · Partly cloudy
This afternoonNear 59°15° · Partly cloudy
TonightDown to 44°7° 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 47°8° by 5 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 7a	Sunny	42°6° (likely 42°6° to 46°8°)	39°4°	0%	5 mph8 km/h from NE, gusts 7 mph12 km/h	86%	33%	0
Sat 8a	Sunny	44°7° (likely 43°6° to 46°8°)	41°5°	0%	5 mph8 km/h from NE, gusts 8 mph12 km/h	82%	40%	0
Sat 9a	Mostly cloudy	48°9° (likely 47°8° to 49°9°)	46°8°	0%	5 mph8 km/h from N, gusts 8 mph13 km/h	77%	64%	1
Sat 10a	Partly sunny	52°11° (likely 50°10° to 52°11°)	52°11°	0%	5 mph8 km/h from N, gusts 9 mph14 km/h	66%	65%	2
Sat 11a	Mostly cloudy	55°13° (likely 51°11° to 55°13°)	55°13°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	57%	63%	3
Sat 12p	Mostly cloudy	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	49%	62%	3
Sat 1p	Mostly cloudy	57°14° (likely 56°13° to 58°14°)	57°14°	0%	5 mph8 km/h from NW, gusts 8 mph12 km/h	51%	61%	4
Sat 2p	Cloudy	59°15° (likely 57°14° to 59°15°)	59°15°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	45%	77%	3
Sat 3p	Cloudy	59°15° (likely 58°14° to 60°16°)	59°15°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	44%	65%	3
Sat 4p	Mostly cloudy	60°16° (likely 58°14° to 60°16°)	60°16°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	42%	50%	2
Sat 5p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	44%	27%	1
Sat 6p	Partly cloudy	58°14° (likely 53°12° to 58°14°)	58°14°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	47%	23%	0
Sat 7p	Mostly clear	55°13° (likely 51°11° to 55°13°)	55°13°	0%	2 mph3 km/h from SW, gusts 6 mph10 km/h	53%	21%	0
Sat 8p	Clear	52°11° (likely 50°10° to 54°12°)	52°11°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	59%	6%	0
Sat 9p	Clear	50°10° (likely 49°9° to 53°12°)	50°10°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	66%	0%	0
Sat 10p	Clear	49°9° (likely 48°9° to 52°11°)	49°9°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	68%	0%	0
Sat 11p	Clear	49°9° (likely 47°8° to 51°11°)	49°9°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	68%	0%	0
Sun 12a	Clear	47°8° (likely 46°8° to 50°10°)	47°8°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	74%	0%	0
Sun 1a	Clear	47°8° (likely 44°7° to 50°10°)	47°8°	0%	2 mph3 km/h from NW, gusts 8 mph12 km/h	74%	0%	0
Sun 2a	Clear	47°8° (likely 44°7° to 50°10°)	47°8°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	76%	0%	0
Sun 3a	Clear	45°7° (likely 43°6° to 50°10°)	45°7°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	86%	0%	0
Sun 4a	Clear	45°7° (likely 43°6° to 50°10°)	45°7°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	82%	1%	0
Sun 5a	Clear	44°7° (likely 43°6° to 49°9°)	44°7°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	86%	0%	0
Sun 6a	Clear	44°7° (likely 43°6° to 48°9°)	44°7°	0%	2 mph3 km/h from N, gusts 5 mph9 km/h	79%	0%	0
Sun 7a	Sunny	44°7° (likely 43°6° to 48°9°)	44°7°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	79%	0%	0
Sun 8a	Sunny	46°8° (likely 44°7° to 48°9°)	46°8°	0%	3 mph5 km/h from N, gusts 4 mph7 km/h	76%	0%	0
Sun 9a	Sunny	49°9° (likely 48°9° to 51°11°)	49°9°	0%	3 mph5 km/h from NW, gusts 4 mph7 km/h	74%	0%	1
Sun 10a	Sunny	52°11° (likely 52°11° to 55°13°)	52°11°	0%	3 mph5 km/h from N, gusts 4 mph7 km/h	69%	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	61%	0%	3
Sun 12p	Sunny	57°14° (likely 57°14° to 61°16°)	57°14°	0%	3 mph5 km/h from NW, gusts 6 mph9 km/h	55%	0%	4
Sun 1p	Sunny	60°16° (likely 60°16° to 63°17°)	60°16°	0%	3 mph5 km/h from NW, gusts 5 mph7 km/h	49%	0%	4
Sun 2p	Sunny	60°16° (likely 60°16° to 64°18°)	60°16°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	47%	0%	4
Sun 3p	Sunny	60°16° (likely 60°16° to 64°18°)	60°16°	0%	3 mph5 km/h from W, gusts 5 mph7 km/h	47%	0%	3
Sun 4p	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	43%	0%	2
Sun 5p	Sunny	60°16° (likely 59°15° to 62°17°)	60°16°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	46%	0%	1
Sun 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from SW, gusts 7 mph11 km/h	51%	0%	0
Sun 7p	Clear	56°13° (likely 52°11° to 57°14°)	56°13°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	57%	0%	0
Sun 8p	Clear	52°11° (likely 50°10° to 55°13°)	52°11°	0%	3 mph5 km/h from SW, gusts 11 mph18 km/h	69%	0%	0
Sun 9p	Clear	51°11° (likely 48°9° to 54°12°)	51°11°	0%	3 mph5 km/h from SW, gusts 11 mph18 km/h	74%	0%	0
Sun 10p	Clear	50°10° (likely 47°8° to 54°12°)	50°10°	0%	3 mph5 km/h from SW, gusts 10 mph16 km/h	77%	0%	0
Sun 11p	Clear	50°10° (likely 46°8° to 53°12°)	50°10°	0%	3 mph5 km/h from SW, gusts 10 mph15 km/h	77%	0%	0
Mon 12a	Clear	50°10° (likely 46°8° to 53°12°)	50°10°	0%	3 mph5 km/h from W, gusts 9 mph15 km/h	77%	0%	0
Mon 1a	Clear	49°9° (likely 46°8° to 53°12°)	47°8°	0%	5 mph8 km/h from W, gusts 10 mph17 km/h	80%	0%	0
Mon 2a	Clear	49°9° (likely 46°8° to 53°12°)	47°8°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	80%	0%	0
Mon 3a	Clear	48°9° (likely 47°8° to 55°13°)	46°8°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	80%	0%	0
Mon 4a	Clear	48°9° (likely 46°8° to 54°12°)	45°7°	0%	6 mph10 km/h from W, gusts 9 mph14 km/h	80%	0%	0
Mon 5a	Clear	47°8° (likely 46°8° to 54°12°)	44°7°	0%	6 mph10 km/h from W, gusts 9 mph14 km/h	83%	1%	0
Mon 6a	Clear	47°8° (likely 46°8° to 54°12°)	44°7°	0%	6 mph10 km/h from W, gusts 10 mph16 km/h	83%	2%	0

Days ahead

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

Today, Oct 24. Cloudy. High 60°16°, low 43°6°. Typical 61°16° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly cloudy, 44°7°
  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, 44°7°
  Dry
Official NWS forecast
Today: Partly sunny, with a high near 60. Northwest wind around 5 mph.
Tonight: Mostly clear, with a low around 43. Northwest wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
58°14°–60°16°
Low, likely
41°5°–45°7°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 15 mph23 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 62°17°, low 44°7°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Official NWS forecast
Day: Sunny. High near 62, with temperatures falling to around 60 in the afternoon. Northwest wind around 3 mph.
Night: Clear. Low around 44, with temperatures rising to around 47 overnight. Southwest wind around 6 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–64°18°
Low, likely
43°6°–47°8°
Typical high / low
61°16° / 44°7°
Wind
9 mph14 km/h, gusts 15 mph24 km/h
UV peak
4
Monday, Oct 26. Sunny. High 65°18°, low 48°9°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  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 65. West wind around 7 mph.
Night: Clear. Low around 48, with temperatures rising to around 50 overnight.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
44°7°–49°9°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 16 mph25 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 55°13°, low 43°6°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 55.
Night: Mostly clear, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
55°13°–60°16°
Low, likely
43°6°–51°11°
Typical high / low
60°16° / 43°6°
Wind
15 mph23 km/h, gusts 25 mph41 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 56°13°, low 49°9°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 56.
Night: Partly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–58°14°
Low, likely
41°5°–49°9°
Typical high / low
60°16° / 43°6°
Wind
10 mph17 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 63°17°, low 53°12°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 55°13°
  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 53.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
47°8°–53°12°
Typical high / low
60°16° / 43°6°
Wind
12 mph20 km/h, gusts 22 mph36 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 65°18°, low 50°10°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  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 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–69°21°
Low, likely
50°10°–55°13°
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 63°17°, low 52°11°. Typical 59°15° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 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
58°14°–68°20°
Low, likely
49°9°–56°13°
Typical high / low
59°15° / 42°6°
Wind
19 mph30 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 62°17°, low 54°12°. Typical 58°14° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°15°
  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
55°13°–67°19°
Low, likely
47°8°–59°15°
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 61°16°, low 56°13°. Typical 58°14° / 42°6°. Rain 0.03 in0.8 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 58°14°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  20% chance
3. Evening
  6 PM–midnight
  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
54°12°–66°19°
Low, likely
48°9°–61°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 43°.
Tomorrow
Dry, high 62°, low 44°.
Monday
Dry, high 65°, low 48°, warming up.
Rest of week
Mostly dry, highs 55–65°.

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

Long Island Sound near Bridgeport Harbor (IN MLLW)

16 mi

Below flood stage

Level: 4.2 ft

Forecast peak 9.1 ft Tue 12 PM

Reading from Sat 6:36 AM · NWS gauge page

Flax Pond at Old Field (IN MLLW)

1.7 mi

Below flood stage

Level: 3.7 ft

Reading from Sat 6:24 AM · NWS gauge page

Great South Bay at Watch Hill (IN MLLW)

19 mi

Below flood stage

Level: 1.7 ft

Reading from Sat 6 AM · NWS gauge page

Carlls River at Babylon

20 mi

Level: 0.5 ft
Flow: 15 cfs

Reading from Sat 6 AM · NWS gauge page

For your home

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

Heating this week

About 72% less heating than a typical week.

This week 26Typical 93

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 12
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at.

Comfort

Dry air outside (dew point 37°F).

Open the windows?

Today, 4:00 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

Setauket weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 45 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 31 min less
Golden hour: 5:20–6:15 PM; Morning 6:56–7:52 AM
Blue hour: 6:15–6:26 PM; Morning 6:45–6:56 AM; first light 6:45 AM

Stars tonight? Fair

Clear 6:26 PM–6:47 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

96% lit · growing

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

Looking north from Setauket. The highest point on the skyline is about 900 ft, 14 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Setauket, NY weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Long Island Sound near Bridgeport Harbor (IN MLLW)

Flax Pond at Old Field (IN MLLW)

Great South Bay at Watch Hill (IN MLLW)

Carlls River at Babylon

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