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.

Fog/Mist

29°F

-2°C

Humidity 96%
Wind Speed Calm
Barometer 30.11 in (1019.6 mb)
Dewpoint 28°F (-2°C)
Visibility 6.00 mi
Last update 17 Jan 10:56 pm EST
Extended Forecast for

5 Miles SSE Blue Point NY

Winter Weather Advisory January 18, 10:00am until January 18, 10:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: A 40 percent chance of rain, mainly after 4am. Mostly cloudy, with a low around 33. West wind 5 to 8 mph.

    Low: 33 °F

    Chance Rain

  • Sunday

    Sunday: Periods of rain and snow, becoming all snow after 11am. High near 36. West wind 6 to 10 mph becoming northeast in the afternoon. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    High: 36 °F

    Rain/Snow
    then Snow

  • Sunday Night

    Sunday Night: A 50 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 27. Wind chill values between 15 and 20. Northwest wind 10 to 14 mph.

    Low: 27 °F

    Chance Snow

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 34. Wind chill values between 15 and 20. Breezy, with a west wind 15 to 25 mph.

    High: 34 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 20. Windy, with a west wind 22 to 28 mph.

    Low: 20 °F

    Partly Cloudy
    and Windy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 25. Breezy.

    High: 25 °F

    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 20. Breezy.

    Low: 20 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 40. Breezy.

    High: 40 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 34. Breezy.

    Low: 34 °F

    Mostly Cloudy
    and Breezy

Detailed Forecast

Tonight
A 40 percent chance of rain, mainly after 4am. Mostly cloudy, with a low around 33. West wind 5 to 8 mph.
Sunday
Periods of rain and snow, becoming all snow after 11am. High near 36. West wind 6 to 10 mph becoming northeast in the afternoon. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Sunday Night
A 50 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 27. Wind chill values between 15 and 20. Northwest wind 10 to 14 mph.
M.L.King Day
Mostly sunny, with a high near 34. Wind chill values between 15 and 20. Breezy, with a west wind 15 to 25 mph.
Monday Night
Partly cloudy, with a low around 20. Windy, with a west wind 22 to 28 mph.
Tuesday
Mostly sunny, with a high near 25. Breezy.
Tuesday Night
Mostly clear, with a low around 20. Breezy.
Wednesday
Mostly sunny, with a high near 40. Breezy.
Wednesday Night
Mostly cloudy, with a low around 34. Breezy.
Thursday
Mostly cloudy, with a high near 38. Breezy.
Thursday Night
Partly cloudy, with a low around 24. Breezy.
Friday
Mostly sunny, with a high near 34.
Friday Night
Mostly cloudy, with a low around 27.
Saturday
Partly sunny, with a high near 34.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Blue Point NY
 40.68°N 72.99°W (Elev. 0 ft)
Last Update:
5:41 pm EST Jan 17, 2026
Forecast Valid:
11pm EST Jan 17, 2026-6pm EST Jan 24, 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