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.

A Few Clouds

38°F

3°C

Humidity 43%
Wind Speed W 14 G 24 mph
Barometer 30.09 in (1018.9 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 28 Nov 9:56 pm EST
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: Mostly clear, with a low around 33. Wind chill values between 25 and 30. Breezy, with a west wind 15 to 22 mph.

    Low: 33 °F

    Mostly Clear
    and Breezy

  • Saturday

    Saturday: Sunny, with a high near 43. Wind chill values between 25 and 35. West wind 7 to 14 mph.

    High: 43 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 33. Calm wind becoming southeast around 6 mph after midnight.

    Low: 33 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain, mainly after 1pm. High near 52. South wind 8 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35. Southwest wind 16 to 18 mph becoming west after midnight.

    Low: 35 °F

    Chance Rain

  • Monday

    Monday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 31.

    Low: 31 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Rain, mainly after 1pm. High near 45. Chance of precipitation is 80%.

    High: 45 °F

    Chance Rain
    then Rain

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.

    Low: 31 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 33. Wind chill values between 25 and 30. Breezy, with a west wind 15 to 22 mph.
Saturday
Sunny, with a high near 43. Wind chill values between 25 and 35. West wind 7 to 14 mph.
Saturday Night
Increasing clouds, with a low around 33. Calm wind becoming southeast around 6 mph after midnight.
Sunday
Rain, mainly after 1pm. High near 52. South wind 8 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35. Southwest wind 16 to 18 mph becoming west after midnight.
Monday
Mostly sunny, with a high near 42.
Monday Night
Increasing clouds, with a low around 31.
Tuesday
Rain, mainly after 1pm. High near 45. Chance of precipitation is 80%.
Tuesday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.
Wednesday
Mostly sunny, with a high near 40.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 42.
Thursday Night
Partly cloudy, with a low around 26.
Friday
Mostly sunny, with a high near 38.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
5:57 pm EST Nov 28, 2025
Forecast Valid:
10pm EST Nov 28, 2025-6pm EST Dec 5, 2025
 
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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