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.

Rain Fog/Mist

37°F

3°C

Humidity 93%
Wind Speed E 15 mph
Barometer 30.25 in (1024.3 mb)
Dewpoint 35°F (2°C)
Visibility 3.00 mi
Wind Chill28°F (-2°C)
Last update 5 Mar 10:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: Rain, mainly before 4am. Low around 35. Northeast wind around 14 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Friday

    Friday: A 30 percent chance of rain, mainly before 7am. Mostly cloudy, with a high near 41. Northeast wind 7 to 11 mph.

    High: 41 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of rain after 1am. Patchy fog after 1am. Otherwise, cloudy, with a low around 34. Northeast wind around 6 mph becoming calm after midnight.

    Low: 34 °F

    Cloudy then
    Slight Chance
    Rain and
    Patchy Fog

  • Saturday

    Saturday: Cloudy, with a high near 49. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 49 °F

    Cloudy

  • Saturday Night

    Saturday Night: Rain likely. Cloudy, with a temperature rising to around 48 by 4am. South wind 7 to 10 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F⇑

    Rain Likely

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny, with a high near 56.

    High: 56 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Tonight
Rain, mainly before 4am. Low around 35. Northeast wind around 14 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
A 30 percent chance of rain, mainly before 7am. Mostly cloudy, with a high near 41. Northeast wind 7 to 11 mph.
Friday Night
A 20 percent chance of rain after 1am. Patchy fog after 1am. Otherwise, cloudy, with a low around 34. Northeast wind around 6 mph becoming calm after midnight.
Saturday
Cloudy, with a high near 49. Calm wind becoming south 5 to 7 mph in the afternoon.
Saturday Night
Rain likely. Cloudy, with a temperature rising to around 48 by 4am. South wind 7 to 10 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Mostly sunny, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 43.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 56.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 50.
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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:
1:01 pm EST Mar 5, 2026
Forecast Valid:
11pm EST Mar 5, 2026-6pm EDT Mar 12, 2026
 
Forecast Discussion
 
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Additional Resources

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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