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.

Overcast

45°F

7°C

Humidity 44%
Wind Speed NW 10 mph
Barometer 30.08 in (1018.7 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 27 Mar 5:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 31. Wind chill values between 25 and 30. North wind 6 to 10 mph.

    Low: 31 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    Showers

  • Saturday

    Saturday: Mostly cloudy through mid morning, then becoming sunny, with a high near 41. Wind chill values between 20 and 30. North wind 13 to 15 mph.

    High: 41 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Northwest wind 5 to 10 mph becoming light after midnight.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 48. Wind chill values between 25 and 35 early. South wind 6 to 15 mph.

    High: 48 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 41. Southwest wind 11 to 14 mph.

    Low: 41 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 63.

    High: 63 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain between 8pm and 2am. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.

    Low: 50 °F

    Chance Rain

Detailed Forecast

Tonight
A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 31. Wind chill values between 25 and 30. North wind 6 to 10 mph.
Saturday
Mostly cloudy through mid morning, then becoming sunny, with a high near 41. Wind chill values between 20 and 30. North wind 13 to 15 mph.
Saturday Night
Partly cloudy, with a low around 29. Northwest wind 5 to 10 mph becoming light after midnight.
Sunday
Mostly sunny, with a high near 48. Wind chill values between 25 and 35 early. South wind 6 to 15 mph.
Sunday Night
Mostly cloudy, with a low around 41. Southwest wind 11 to 14 mph.
Monday
Partly sunny, with a high near 56.
Monday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 45.
Tuesday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 63.
Tuesday Night
A chance of rain between 8pm and 2am. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.
Wednesday
A 40 percent chance of rain after 2pm. Partly sunny, with a high near 66.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 42.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 52.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 38.
Friday
A 50 percent chance of rain. Cloudy, with a high near 47.
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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:
3:17 pm EDT Mar 27, 2026
Forecast Valid:
6pm EDT Mar 27, 2026-6pm EDT Apr 3, 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