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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy and Breezy

19°F

-7°C

Humidity 52%
Wind Speed N 23 G 32 mph
Barometer 29.80 in (1009.3 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill2°F (-17°C)
Last update 1 Feb 9:56 pm EST
Extended Forecast for

Mount Sinai NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 14. Wind chill values between zero and 5. Northwest wind 14 to 17 mph.

    Low: 14 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 29. Wind chill values between zero and 10. Northwest wind 10 to 14 mph.

    High: 29 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 16. Northwest wind around 6 mph.

    Low: 16 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 30. Wind chill values between 10 and 20. West wind 5 to 7 mph.

    High: 30 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 21. West wind 3 to 6 mph.

    Low: 21 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 14. Wind chill values between zero and 5. Northwest wind 14 to 17 mph.
Monday
Sunny, with a high near 29. Wind chill values between zero and 10. Northwest wind 10 to 14 mph.
Monday Night
Mostly clear, with a low around 16. Northwest wind around 6 mph.
Tuesday
Sunny, with a high near 30. Wind chill values between 10 and 20. West wind 5 to 7 mph.
Tuesday Night
Mostly cloudy, with a low around 21. West wind 3 to 6 mph.
Wednesday
Partly sunny, with a high near 30.
Wednesday Night
Partly cloudy, with a low around 14.
Thursday
Mostly sunny, with a high near 28.
Thursday Night
Mostly clear, with a low around 15.
Friday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 29.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 13.
Saturday
Mostly sunny and cold, with a high near 20. Blustery.
Saturday Night
Partly cloudy, with a low around 6. Blustery.
Sunday
Mostly sunny and cold, with a high near 18.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Sinai NY
 40.95°N 73.02°W (Elev. 56 ft)
Last Update:
6:39 pm EST Feb 1, 2026
Forecast Valid:
10pm EST Feb 1, 2026-6pm EST Feb 8, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

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Chance of Precipitation