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

39°F

4°C

Humidity 50%
Wind Speed SW 14 mph
Barometer 30.01 in (1016.3 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 13 Mar 3:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: A slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a south wind 14 to 21 mph. Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 48. Breezy, with a west wind around 22 mph, with gusts as high as 38 mph.

    High: 48 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 34. West wind 5 to 15 mph.

    Low: 34 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 48. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 48 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain after 2am. Low around 40. Southeast wind 11 to 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 40 °F

    Mostly Cloudy
    then Rain

  • Monday

    Monday: Rain, with thunderstorms also possible after 2pm. High near 58. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 58 °F

    Rain and
    Breezy

  • Monday Night

    Monday Night: Rain and possibly a thunderstorm. Low around 37. Windy. Chance of precipitation is 100%.

    Low: 37 °F

    Rain and
    Windy

  • Tuesday

    Tuesday: A 30 percent chance of rain before 8am. Mostly sunny, with a high near 45. Breezy.

    High: 45 °F

    Breezy.
    Chance Rain
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a south wind 14 to 21 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 48. Breezy, with a west wind around 22 mph, with gusts as high as 38 mph.
Saturday Night
Increasing clouds, with a low around 34. West wind 5 to 15 mph.
Sunday
Mostly cloudy, with a high near 48. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Sunday Night
Rain after 2am. Low around 40. Southeast wind 11 to 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain, with thunderstorms also possible after 2pm. High near 58. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain and possibly a thunderstorm. Low around 37. Windy. Chance of precipitation is 100%.
Tuesday
A 30 percent chance of rain before 8am. Mostly sunny, with a high near 45. Breezy.
Tuesday Night
Partly cloudy, with a low around 26.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 35.
Friday
Partly sunny, with a high near 47.
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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:
2:26 pm EDT Mar 13, 2026
Forecast Valid:
4pm EDT Mar 13, 2026-6pm EDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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