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.

Fair

53°F

12°C

Humidity 38%
Wind Speed N 10 mph
Barometer 30.32 in (1026.7 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 11 Apr 8:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: Patchy frost between 4am and 5am. Otherwise, clear, with a low around 38. North wind 5 to 9 mph.

    Low: 38 °F

    Clear then
    Patchy Frost

  • Sunday

    Sunday: Increasing clouds, with a high near 55. Northeast wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph.

    High: 55 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 45. South wind 11 to 13 mph.

    Low: 45 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Partly sunny, with a high near 68. Southwest wind 11 to 17 mph.

    High: 68 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 56. Southwest wind 8 to 15 mph.

    Low: 56 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 75.

    High: 75 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Patchy frost between 4am and 5am. Otherwise, clear, with a low around 38. North wind 5 to 9 mph.
Sunday
Increasing clouds, with a high near 55. Northeast wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Mostly cloudy, with a low around 45. South wind 11 to 13 mph.
Monday
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 68. Southwest wind 11 to 17 mph.
Monday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 56. Southwest wind 8 to 15 mph.
Tuesday
Partly sunny, with a high near 75.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
Mostly cloudy, with a low around 58.
Thursday
Partly sunny, with a high near 75.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 68.
Friday Night
Mostly cloudy, with a low around 51.
Saturday
Partly sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
6:36 pm EDT Apr 11, 2026
Forecast Valid:
9pm EDT Apr 11, 2026-6pm EDT Apr 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation