Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

38°F

3°C

Humidity 60%
Wind Speed Calm
Barometer 29.87 in (1011.5 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 26 Feb 5:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: A 20 percent chance of snow showers before 7pm.  Mostly cloudy, then gradually becoming mostly clear, with a low around 25. Calm wind becoming northeast around 5 mph.

    Low: 25 °F

    Slight Chance
    Snow Showers
    then Mostly
    Clear

  • Friday

    Friday: Sunny, with a high near 39. Calm wind becoming south around 5 mph.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 31. Light south wind.

    Low: 31 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 45. South wind around 6 mph.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30. Light and variable wind becoming north around 6 mph after midnight.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of snow after 1pm.  Partly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny
    then Chance
    Snow

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of snow showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 25. Calm wind becoming northeast around 5 mph.
Friday
Sunny, with a high near 39. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 31. Light south wind.
Saturday
Mostly sunny, with a high near 45. South wind around 6 mph.
Saturday Night
Partly cloudy, with a low around 30. Light and variable wind becoming north around 6 mph after midnight.
Sunday
Partly sunny, with a high near 37.
Sunday Night
Partly cloudy, with a low around 19.
Monday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Partly sunny, with a high near 36.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 30.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 43.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 31.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
12:59 pm EST Feb 26, 2026
6pm EST Feb 26, 2026-6pm EST Mar 5, 2026
 
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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