Observed 4:00 PM EDT at KISP

Great River, NY weather

Sunny and 63°17°, jacket by 7 PM.

Mostly agree

Now 63°17°

Sunny

Wind: 6 mph9 km/h; From the northwest. Up to 6 mph9 km/h through 4 AM
Dew point: 28°−2°; Dry · up to 38°3° by 5 PM (comfortable)
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 31Good; Ozone · tomorrow moderate
Pressure: 30.5 inHg1033 hPa; Falling slowly · −0.03 inHg−1.0 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

3°2° warmer than this time yesterday (59°15° then, 62°17° now)

Good hours for

Below 50°10° tonight after 9 PM
Low 40°4° tonight at 5 AM
Above 50°10° tomorrow by 10 AM

This afternoonNear 59°15° · Partly cloudy
TonightDown to 40°4° by 5 AM · Partly cloudy
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonNear 61°16° · Clear
Tomorrow nightDown to 43°6° by 5 AM · Clear
Monday morningUp to 57°14° by 11 AM · Clear
Monday afternoonUp to 66°19° by 3 PM · 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 4p	Sunny	60°16° (likely 58°14° to 62°17°)	60°16°	0%	5 mph8 km/h from SW, gusts 7 mph11 km/h	44%	43%	1
Sat 5p	Partly sunny	58°14° (likely 57°14° to 61°16°)	58°14°	0%	5 mph8 km/h from SW, gusts 7 mph11 km/h	47%	51%	0
Sat 6p	Partly cloudy	57°14° (likely 54°12° to 57°14°)	57°14°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	49%	53%	0
Sat 7p	Mostly clear	54°12° (likely 51°11° to 54°12°)	54°12°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	55%	30%	0
Sat 8p	Mostly clear	50°10° (likely 49°9° to 52°11°)	50°10°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	63%	49%	0
Sat 9p	Mostly clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	2 mph3 km/h from W, gusts 5 mph9 km/h	71%	44%	0
Sat 10p	Mostly clear	47°8° (likely 47°8° to 50°10°)	47°8°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	74%	42%	0
Sat 11p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	76%	42%	0
Sun 12a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	2 mph3 km/h from NW, gusts 8 mph12 km/h	82%	34%	0
Sun 1a	Clear	44°7° (likely 43°6° to 47°8°)	44°7°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	82%	14%	0
Sun 2a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	2 mph3 km/h from NW, gusts 7 mph12 km/h	86%	0%	0
Sun 3a	Clear	42°6° (likely 41°5° to 47°8°)	42°6°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	89%	0%	0
Sun 4a	Clear	41°5° (likely 40°4° to 46°8°)	39°4°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	89%	1%	0
Sun 5a	Clear	40°4° (likely 39°4° to 46°8°)	38°3°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	92%	1%	0
Sun 6a	Clear	40°4° (likely 38°3° to 46°8°)	38°3°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	92%	1%	0
Sun 7a	Sunny	41°5° (likely 37°3° to 45°7°)	39°4°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	89%	1%	0
Sun 8a	Sunny	42°6° (likely 38°3° to 46°8°)	40°4°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	89%	3%	0
Sun 9a	Sunny	49°9° (likely 46°8° to 49°9°)	48°9°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	71%	1%	1
Sun 10a	Sunny	53°12° (likely 53°12° to 55°13°)	53°12°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	61%	0%	2
Sun 11a	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	55%	0%	3
Sun 12p	Sunny	60°16° (likely 59°15° to 63°17°)	60°16°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	47%	0%	4
Sun 1p	Sunny	61°16° (likely 61°16° to 65°18°)	61°16°	0%	5 mph8 km/h from W, gusts 6 mph9 km/h	44%	0%	4
Sun 2p	Sunny	62°17° (likely 61°16° to 65°18°)	62°17°	0%	5 mph8 km/h from SW, gusts 6 mph10 km/h	43%	0%	4
Sun 3p	Sunny	63°17° (likely 61°16° to 64°18°)	63°17°	0%	5 mph8 km/h from SW, gusts 9 mph15 km/h	43%	0%	3
Sun 4p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	6 mph10 km/h from SW, gusts 8 mph13 km/h	44%	0%	2
Sun 5p	Sunny	61°16° (likely 59°15° to 62°17°)	61°16°	0%	6 mph10 km/h from SW, gusts 8 mph13 km/h	51%	0%	1
Sun 6p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	5 mph8 km/h from SW, gusts 7 mph12 km/h	55%	0%	0
Sun 7p	Clear	57°14° (likely 52°11° to 57°14°)	57°14°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	59%	0%	0
Sun 8p	Clear	52°11° (likely 51°11° to 54°12°)	52°11°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	71%	0%	0
Sun 9p	Clear	51°11° (likely 51°11° to 54°12°)	51°11°	0%	3 mph5 km/h from SW, gusts 10 mph16 km/h	77%	0%	0
Sun 10p	Clear	50°10° (likely 50°10° to 53°12°)	48°9°	0%	5 mph8 km/h from SW, gusts 10 mph16 km/h	80%	0%	0
Sun 11p	Clear	49°9° (likely 49°9° to 53°12°)	47°8°	0%	5 mph8 km/h from SW, gusts 10 mph16 km/h	86%	0%	0
Mon 12a	Clear	48°9° (likely 48°9° to 52°11°)	46°8°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	86%	0%	0
Mon 1a	Clear	48°9° (likely 47°8° to 51°11°)	46°8°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	86%	1%	0
Mon 2a	Clear	47°8° (likely 45°7° to 51°11°)	45°7°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	89%	0%	0
Mon 3a	Clear	45°7° (likely 44°7° to 50°10°)	43°6°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	93%	0%	0
Mon 4a	Clear	44°7° (likely 44°7° to 49°9°)	41°5°	0%	6 mph10 km/h from W, gusts 12 mph20 km/h	93%	0%	0
Mon 5a	Clear	43°6° (likely 43°6° to 48°9°)	39°4°	0%	6 mph10 km/h from W, gusts 12 mph20 km/h	96%	0%	0
Mon 6a	Clear	42°6° (likely 42°6° to 48°9°)	38°3°	0%	6 mph10 km/h from W, gusts 13 mph20 km/h	100%	1%	0
Mon 7a	Sunny	43°6° (likely 43°6° to 47°8°)	39°4°	0%	6 mph10 km/h from W, gusts 12 mph20 km/h	96%	13%	0
Mon 8a	Sunny	44°7° (likely 44°7° to 48°9°)	41°5°	0%	6 mph10 km/h from W, gusts 12 mph20 km/h	93%	11%	0
Mon 9a	Sunny	49°9° (likely 49°9° to 52°11°)	47°8°	0%	6 mph10 km/h from W, gusts 14 mph22 km/h	80%	12%	1
Mon 10a	Sunny	53°12° (likely 53°12° to 57°14°)	53°12°	0%	7 mph11 km/h from W, gusts 13 mph21 km/h	74%	8%	2
Mon 11a	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	7 mph11 km/h from W, gusts 13 mph21 km/h	67%	12%	3
Mon 12p	Sunny	60°16° (likely 60°16° to 64°18°)	60°16°	0%	8 mph13 km/h from W, gusts 12 mph19 km/h	62%	5%	4
Mon 1p	Sunny	63°17° (likely 63°17° to 66°19°)	63°17°	0%	9 mph14 km/h from W, gusts 12 mph20 km/h	56%	1%	4
Mon 2p	Sunny	65°18° (likely 64°18° to 66°19°)	65°18°	0%	9 mph14 km/h from W, gusts 13 mph20 km/h	54%	1%	4
Mon 3p	Sunny	66°19° (likely 65°18° to 67°19°)	66°19°	0%	9 mph14 km/h from W, gusts 12 mph19 km/h	54%	2%	3

Days ahead

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

Today, Oct 24. Cloudy. High 60°16°, low 40°4°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Partly sunny, 60°16°
  Dry
2. Evening
  6 PM–midnight
  Mostly clear, 50°10°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Today: Mostly sunny. High near 60, with temperatures falling to around 58 in the afternoon. Southwest wind around 5 mph.
Tonight: Mostly clear, with a low around 40. West wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–62°17°
Low, likely
38°3°–43°6°
Typical high / low
61°16° / 44°7°
Wind
7 mph11 km/h, gusts 14 mph23 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 42°6°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Official NWS forecast
Day: Sunny. High near 63, with temperatures falling to around 61 in the afternoon. West wind around 6 mph.
Night: Clear, with a low around 42. West wind around 6 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
37°3°–45°7°
Typical high / low
61°16° / 44°7°
Wind
10 mph16 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, 44°7°
  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, 53°12°
  Dry
Official NWS forecast
Day: Sunny, with a high near 66. West wind 6 to 9 mph.
Night: Mostly clear. Low around 49, with temperatures rising to around 51 overnight.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
42°6°–49°9°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 18 mph28 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 59°15°, low 43°6°. Typical 60°16° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°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 59.
Night: Mostly clear, with a low around 43.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
57°14°–59°15°
Low, likely
43°6°–52°11°
Typical high / low
60°16° / 43°6°
Wind
11 mph18 km/h, gusts 24 mph38 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 59°15°, low 48°9°. Typical 60°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 59.
Night: Partly cloudy, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
55°13°–59°15°
Low, likely
42°6°–48°9°
Typical high / low
60°16° / 43°6°
Wind
10 mph15 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 64°18°, low 53°12°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  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: Mostly clear, with a low around 53.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–65°18°
Low, likely
48°9°–53°12°
Typical high / low
60°16° / 43°6°
Wind
11 mph18 km/h, gusts 30 mph49 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 67°19°, low 52°11°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  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 67.
Night: Mostly clear, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–71°22°
Low, likely
52°11°–55°13°
Typical high / low
59°15° / 42°6°
Wind
10 mph16 km/h, gusts 25 mph41 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, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 57°14°
  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
61°16°–68°20°
Low, likely
50°10°–54°12°
Typical high / low
59°15° / 42°6°
Wind
11 mph18 km/h, gusts 24 mph38 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 64°18°, low 57°14°. Typical 58°14° / 42°6°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 59°15°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 61°16°
  30% chance · 0.03 in0.6 mm
4. Overnight
  midnight–6 AM
  Drizzle, 62°16°
  30% chance · 0.08 in1.9 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
59°15°–70°21°
Low, likely
56°13°–57°14°
Typical high / low
58°14° / 42°6°
Wind
11 mph18 km/h, gusts 23 mph37 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 65°18°, low 60°16°. Typical 58°14° / 42°6°. Rain 0.68 in17 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Showers, 63°17°
  30% chance · 0.18 in4.5 mm
2. Afternoon
  noon–6 PM
  Showers, 65°19°
  20% chance · 0.27 in6.9 mm
3. Evening
  6 PM–midnight
  Showers, 64°18°
  20% chance · 0.35 in8.8 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–69°21°
Low, likely
58°14°–65°18°
Typical high / low
58°14° / 42°6°
Wind
22 mph35 km/h, gusts 40 mph65 km/h

10 days15 days30 days

The outlook

Today
Dry, high 60°, low 40°.
Tomorrow
Dry, high 63°, low 42°, warming up.
Monday
Dry, high 66°, low 49°, warming up.
Rest of week
Mostly dry, highs 59–67°.

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

8.0 mi

Level: 0.5 ft
Flow: 15 cfs

Reading from Sat 3 PM · NWS gauge page

Great South Bay at Watch Hill (IN MLLW)

9.9 mi

Below flood stage

Level: 1.5 ft

Reading from Sat 3 PM · NWS gauge page

Great South Bay at Lindenhurst (IN MLLW)

9.9 mi

Below flood stage

Level: 1.6 ft

Reading from Sat 3 PM · NWS gauge page

Flax Pond at Old Field (IN MLLW)

17 mi

Below flood stage

Level: 5.3 ft

Reading from Sat 2:24 PM · NWS gauge page

For your home

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

Heating this week

About 70% 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: 18
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 28°F).

Open the windows?

Sun, 12:00 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

Great River 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 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 1–6:47 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

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

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

Great River, 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 Watch Hill (IN MLLW)

Great South Bay at Lindenhurst (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