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.

Light Drizzle Fog

47°F

8°C

Humidity 97%
Wind Speed SW 14 mph
Barometer 29.45 in (997.3 mb)
Dewpoint 46°F (8°C)
Visibility 0.25 mi
Wind Chill41°F (5°C)
Last update 29 Dec 8:56 am EST
Extended Forecast for

Islip Terrace NY

Dense Fog Advisory December 29, 10:02am until December 29, 12:00pm
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory December 29, 10:02am until December 29, 12:00pm

    NOW until 12:00pm Mon

    Dense Fog Advisory

  • Today

    High: 50 °F⇓

    Rain and
    Areas Fog

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Wind chill values between 15 and 20. Breezy, with a west wind 17 to 20 mph, with gusts as high as 40 mph.

    Low: 25 °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 20 to 22 mph, with gusts as high as 39 mph.

    High: 33 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 10 to 15 mph, with gusts as high as 31 mph.

    Low: 24 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 36. West wind 10 to 14 mph, with gusts as high as 25 mph.

    High: 36 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 20.

    Low: 20 °F

    Chance Snow

  • New Year's Day

    New Year's Day: Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

Detailed Forecast

Today
Rain, mainly before 4pm. Areas of fog before 1pm. Temperature falling to around 41 by 5pm. Breezy, with a west wind 14 to 20 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Partly cloudy, with a low around 25. Wind chill values between 15 and 20. Breezy, with a west wind 17 to 20 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 20 to 22 mph, with gusts as high as 39 mph.
Tuesday Night
Mostly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 10 to 15 mph, with gusts as high as 31 mph.
Wednesday
Partly sunny, with a high near 36. West wind 10 to 14 mph, with gusts as high as 25 mph.
Wednesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 20.
New Year's Day
Partly sunny, with a high near 29.
Thursday Night
Partly cloudy, with a low around 18.
Friday
Mostly sunny, with a high near 30.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Partly sunny, with a high near 34.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
Mostly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
8:56 am EST Dec 29, 2025
Forecast Valid:
10am EST Dec 29, 2025-6pm EST Jan 4, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation