National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

33°F

1°C

Humidity 78%
Wind Speed Calm
Barometer 30.02 in (1016.5 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 28 Dec 5:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

Winter Weather Advisory until December 28, 10:00pm
Click here for hazard details and duration
...
  •  
    Winter Weather Advisory until December 28, 10:00pm

    NOW until 10:00pm Sun

    Winter Weather Advisory

  • Tonight

    Low: 31 °F⇑

    Rain/Freezing
    Rain then
    Rain

  • Monday

    Monday: Rain, mainly between 10am and 4pm. High near 51. Breezy, with a south wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Rain and
    Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 27. Wind chill values between 15 and 25. Breezy, with a west wind around 24 mph, with gusts as high as 40 mph.

    Low: 27 °F

    Partly Cloudy
    and Breezy

  • Tuesday

    Tuesday: Partly sunny, with a high near 33. Wind chill values between 15 and 20. Breezy, with a west wind 21 to 24 mph, with gusts as high as 37 mph.

    High: 33 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 26. Breezy, with a west wind 15 to 23 mph.

    Low: 26 °F

    Partly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

  • New Year's Day

    New Year's Day: Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny

Detailed Forecast

Tonight
Rain or freezing rain likely before 10pm, then rain. Temperature rising to around 42 by 4am. South wind 5 to 11 mph. Chance of precipitation is 80%. Little or no ice accumulation expected.
Monday
Rain, mainly between 10am and 4pm. High near 51. Breezy, with a south wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Partly cloudy, with a low around 27. Wind chill values between 15 and 25. Breezy, with a west wind around 24 mph, with gusts as high as 40 mph.
Tuesday
Partly sunny, with a high near 33. Wind chill values between 15 and 20. Breezy, with a west wind 21 to 24 mph, with gusts as high as 37 mph.
Tuesday Night
Mostly cloudy, with a low around 26. Breezy, with a west wind 15 to 23 mph.
Wednesday
Partly sunny, with a high near 36.
Wednesday Night
Mostly cloudy, with a low around 23.
New Year's Day
Partly sunny, with a high near 30.
Thursday Night
Mostly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 36.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 26.
Sunday
Mostly sunny, with a high near 36.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
6:09 pm EST Dec 28, 2025
Forecast Valid:
6pm EST Dec 28, 2025-6pm EST Jan 4, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation