National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy and Breezy

47°F

8°C

Humidity 31%
Wind Speed NW 24 G 36 mph
Barometer 29.95 in (1014.2 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 14 Mar 12:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 47. Breezy, with a west wind around 25 mph, with gusts as high as 41 mph.

    High: 47 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 31. West wind 11 to 16 mph decreasing to 5 to 10 mph after midnight.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 46. Northeast wind 6 to 11 mph becoming southeast in the afternoon.

    High: 46 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Rain after 2am. Temperature rising to around 49 by 5am. Southeast wind 9 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 43 °F⇑

    Mostly Cloudy
    then Rain

  • Monday

    Monday: Rain, with thunderstorms also possible after 11am. Some of the storms could produce heavy rainfall. High near 59. Breezy, with a south wind 21 to 25 mph, with gusts as high as 43 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 59 °F

    Heavy Rain
    and Breezy

  • Monday Night

    Monday Night: Rain before 5am, then a chance of rain and snow. The rain could be heavy at times. Some thunder is also possible. Low around 35. Windy. Chance of precipitation is 100%. Little or no snow accumulation expected.

    Low: 35 °F

    Windy. Heavy
    Rain then
    Rain/Snow

  • Tuesday

    Tuesday: A chance of rain and snow before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 44. Breezy. Chance of precipitation is 30%.

    High: 44 °F

    Breezy.
    Chance
    Rain/Snow
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 47. Breezy, with a west wind around 25 mph, with gusts as high as 41 mph.
Tonight
Mostly clear, with a low around 31. West wind 11 to 16 mph decreasing to 5 to 10 mph after midnight.
Sunday
Partly sunny, with a high near 46. Northeast wind 6 to 11 mph becoming southeast in the afternoon.
Sunday Night
Rain after 2am. Temperature rising to around 49 by 5am. Southeast wind 9 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Rain, with thunderstorms also possible after 11am. Some of the storms could produce heavy rainfall. High near 59. Breezy, with a south wind 21 to 25 mph, with gusts as high as 43 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain before 5am, then a chance of rain and snow. The rain could be heavy at times. Some thunder is also possible. Low around 35. Windy. Chance of precipitation is 100%. Little or no snow accumulation expected.
Tuesday
A chance of rain and snow before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 44. Breezy. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 25.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
Mostly sunny, with a high near 45.
Thursday Night
Partly cloudy, with a low around 35.
Friday
Mostly sunny, with a high near 48.
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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:
3:09 am EDT Mar 14, 2026
Forecast Valid:
1pm EDT Mar 14, 2026-6pm EDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation