Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fog/Mist

20°F

-7°C

Humidity 85%
Wind Speed N 9 mph
Barometer 29.75 in (1007.5 mb)
Dewpoint 16°F (-9°C)
Visibility 5.00 mi
Wind Chill10°F (-12°C)
Last update 26 Jan 4:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: A 30 percent chance of snow.  Cloudy, with a low around 23. Wind chill values between 15 and 20. North wind around 13 mph.

    Low: 23 °F

    Chance Snow

  • Monday

    Monday: A 40 percent chance of snow before 1pm.  Cloudy, with a high near 30. Wind chill values between 15 and 20. North wind 8 to 13 mph becoming northwest in the afternoon.

    High: 30 °F

    Chance Snow

  • Monday Night

    Monday Night: Patchy blowing snow before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 15. Wind chill values between zero and 10. Blustery, with a northwest wind 16 to 20 mph.

    Low: 15 °F

    Blustery.
    Patchy
    Blowing Snow
    then Mostly
    Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 22. Wind chill values between zero and 10. West wind 13 to 16 mph.

    High: 22 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 13. West wind 13 to 15 mph.

    Low: 13 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 23.

    High: 23 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 21.

    High: 21 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 7.

    Low: 7 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of snow. Cloudy, with a low around 23. Wind chill values between 15 and 20. North wind around 13 mph.
Monday
A 40 percent chance of snow before 1pm. Cloudy, with a high near 30. Wind chill values between 15 and 20. North wind 8 to 13 mph becoming northwest in the afternoon.
Monday Night
Patchy blowing snow before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 15. Wind chill values between zero and 10. Blustery, with a northwest wind 16 to 20 mph.
Tuesday
Increasing clouds, with a high near 22. Wind chill values between zero and 10. West wind 13 to 16 mph.
Tuesday Night
Mostly clear, with a low around 13. West wind 13 to 15 mph.
Wednesday
Mostly sunny, with a high near 23.
Wednesday Night
Mostly cloudy, with a low around 11.
Thursday
Mostly sunny, with a high near 21.
Thursday Night
Mostly clear, with a low around 7.
Friday
Mostly sunny and cold, with a high near 20.
Friday Night
Mostly clear, with a low around 10.
Saturday
Sunny, with a high near 25.
Saturday Night
Mostly clear, with a low around 14.
Sunday
Mostly sunny, with a high near 28.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
1:49 am EST Jan 26, 2026
5am EST Jan 26, 2026-6pm EST Feb 1, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database