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

41°F

5°C

Humidity 89%
Wind Speed Calm
Barometer 30.08 in (1018.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 7 Apr 4:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: A 30 percent chance of showers. Mostly cloudy, with a low around 40. Southeast wind around 7 mph.

    Low: 40 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 52. Breezy, with a west wind 5 to 10 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 52 °F

    Chance
    Showers then
    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30. Wind chill values between 20 and 25. Blustery, with a north wind 13 to 22 mph.

    Low: 30 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 47. Wind chill values between 20 and 30 early. North wind 9 to 13 mph becoming southeast in the afternoon.

    High: 47 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 32. South wind 5 to 8 mph becoming calm after midnight.

    Low: 32 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers. Mostly cloudy, with a low around 40. Southeast wind around 7 mph.
Tuesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 52. Breezy, with a west wind 5 to 10 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.
Tuesday Night
Mostly clear, with a low around 30. Wind chill values between 20 and 25. Blustery, with a north wind 13 to 22 mph.
Wednesday
Sunny, with a high near 47. Wind chill values between 20 and 30 early. North wind 9 to 13 mph becoming southeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 32. South wind 5 to 8 mph becoming calm after midnight.
Thursday
Mostly sunny, with a high near 52.
Thursday Night
Partly cloudy, with a low around 39.
Friday
Mostly sunny, with a high near 59.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Mostly clear, with a low around 44.
Sunday
Sunny, with a high near 59.
Sunday Night
Mostly cloudy, with a low around 46.
Monday
Partly sunny, with a high near 67.
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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:
4:36 am EDT Apr 7, 2026
Forecast Valid:
5am EDT Apr 7, 2026-6pm EDT Apr 13, 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