GREAT RIVER, NY 11739 Weather Forecast & Current Conditions

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ISLIP, NY
Current Weather

6:56 AM EDT MAY 17, 2026
Broken Clouds
63°F
Feels Like: 63°F
Dewpoint: 54°F
Rel. Hum.: 72%
Visibility: 10 miles
Wind: Calm
Pressure: 29.98 inches
Last 72 hours

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GREAT RIVER, NY 11739
Weather Forecast

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Snow Depth pages
TODAY
Mostly sunny. Highs in the upper 70s. Southwest winds 10 to 15 mph.
TONIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows around 60. Southwest winds 10 to 15 mph, diminishing to around 5 mph after midnight.
MONDAY
Mostly sunny. Highs in the mid 70s. Southeast winds 5 to 10 mph.
MONDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows around 60. South winds 10 to 15 mph.
TUESDAY
Sunny. Highs in the upper 70s. Southwest winds 15 to 20 mph. Gusts up to 30 mph in the afternoon.
TUESDAY NIGHT
Partly cloudy. Lows in the lower 60s.
WEDNESDAY
Sunny in the morning, then partly sunny with showers likely in the afternoon. Highs in the lower 80s. Chance of rain 70 percent.
WEDNESDAY NIGHT
Mostly cloudy. Showers likely, mainly in the evening. Lows in the mid 50s. Chance of rain 70 percent.
THURSDAY
Partly sunny. Highs around 70.
THURSDAY NIGHT
Mostly cloudy. Lows in the lower 50s.
FRIDAY
Partly sunny. Highs in the mid 60s.
FRIDAY NIGHT
Mostly cloudy. Lows in the lower 50s.
SATURDAY
Mostly cloudy with a 40 percent chance of showers. Highs in the mid 60s.

Visible Weather Satellite
GREAT RIVER, NY 11739
Infrared Weather Satellite
GREAT RIVER, NY 11739
NEXRAD Weather Radar
GREAT RIVER, NY 11739

ISLIP, NY 3 hourly weather forecast

weather forecast created  8:00 PM EDT  5/16/2026
Sunday
17 MAY 2026
GREAT RIVER, NY 11739 weather forecast Day 1, 0 hours 2 AM 61° 59° Mostly Cloudy 8%

0% Thunder
( 1% severe)
SW   13 75% 53°
Low 60° GREAT RIVER, NY 11739 weather forecast Day 1, 3 hours 5 AM 61° 60° Partly Cloudy WSW   9 81% 55°
High 84° GREAT RIVER, NY 11739 weather forecast Day 1, 6 hours 8 AM 67° 67° Partly Cloudy 0%

0% Thunder
( 0% severe)
WNW   7 73% 58°

Partly Cloudy



GREAT RIVER, NY 11739 weather forecast Day 1, 9 hours 11 AM 78° 79° Partly Cloudy W   7 52% 59°
GREAT RIVER, NY 11739 weather forecast Day 1, 12 hours 2 PM 82° 82° Clear 0%

0% Thunder
( 2% severe)
SW   12 44% 58°
GREAT RIVER, NY 11739 weather forecast Day 1, 15 hours 5 PM 81° 81° Clear SSW   13 46% 58°
GREAT RIVER, NY 11739 weather forecast Day 1, 18 hours 8 PM 70° 70° Partly Cloudy 3%

0% Thunder
( 2% severe)
SSW   8 68% 59°
GREAT RIVER, NY 11739 weather forecast Day 1, 21 hours 11 PM 66° 66° Partly Cloudy SSW   3 75% 58°
Monday
18 MAY 2026
GREAT RIVER, NY 11739 weather forecast Day 2, 0 hours 2 AM 65° 65° Partly Cloudy 5%

0% Thunder
( 3% severe)
W   1 75% 57°
Low 61° GREAT RIVER, NY 11739 weather forecast Day 2, 3 hours 5 AM 62° 63° Mostly Cloudy ENE   2 81% 56°
High 77° GREAT RIVER, NY 11739 weather forecast Day 2, 6 hours 8 AM 66° 66° Partly Cloudy 1%

0% Thunder
( 2% severe)
E   5 68% 55°

Partly Cloudy



GREAT RIVER, NY 11739 weather forecast Day 2, 9 hours 11 AM 74° 74° Partly Cloudy ESE   10 50% 54°
GREAT RIVER, NY 11739 weather forecast Day 2, 12 hours 2 PM 75° 75° Partly Cloudy 0%

0% Thunder
( 3% severe)
SSE   12 48% 54°
GREAT RIVER, NY 11739 weather forecast Day 2, 15 hours 5 PM 73° 73° Clear S   10 55% 56°
GREAT RIVER, NY 11739 weather forecast Day 2, 18 hours 8 PM 64° 64° Partly Cloudy 2%

0% Thunder
( 8% severe)
S   7 78% 57°
GREAT RIVER, NY 11739 weather forecast Day 2, 21 hours 11 PM 62° 61° Partly Cloudy S   8 84% 57°

ISLIP, NY extended weather forecast

Tuesday
19 MAY 2026
Wednesday
20 MAY 2026
Thursday
21 MAY 2026
Friday
22 MAY 2026
Saturday
23 MAY 2026
Low 61° Low 62° Low 52° Low 50° Low 53°
High 84° High 80° High 69° High 64° High 72°
GREAT RIVER, NY 11739 weather forecast Day 3 GREAT RIVER, NY 11739 weather forecast Day 4 GREAT RIVER, NY 11739 weather forecast Day 5 GREAT RIVER, NY 11739 weather forecast Day 6 GREAT RIVER, NY 11739 weather forecast Day 7
Partly Cloudy
37% Rain
Partly Cloudy
49% Rain
Partly Cloudy
35% Rain
Overcast
63% Rain
Overcast
55% Rain
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