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

53°F

12°C

Humidity 86%
Wind Speed E 14 G 23 mph
Barometer 29.47 in (998.0 mb)
Dewpoint 49°F (9°C)
Visibility 4.00 mi
Wind Chill49°F (9°C)
Last update 12 Nov 2:56 pm EST
Extended Forecast for

Stony Brook NY

  • This Afternoon

    This Afternoon: Showers. High near 60. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Showers

  • Tonight

    Tonight: Showers before midnight, then rain after midnight. Low around 38. Breezy, with a northeast wind 15 to 22 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 38 °F

    Showers and
    Breezy

  • Friday

    Friday: Rain, mainly before 4pm. High near 48. Breezy, with a north wind 14 to 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 48 °F

    Rain and
    Breezy

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 36. North wind around 9 mph.

    Low: 36 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 48. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.

    High: 48 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

Detailed Forecast

This Afternoon
Showers. High near 60. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Showers before midnight, then rain after midnight. Low around 38. Breezy, with a northeast wind 15 to 22 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain, mainly before 4pm. High near 48. Breezy, with a north wind 14 to 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 30 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 36. North wind around 9 mph.
Saturday
Partly sunny, with a high near 48. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Sunny, with a high near 53.
Tuesday Night
Mostly clear, with a low around 39.
Wednesday
Sunny, with a high near 57.
Wednesday Night
Mostly clear, with a low around 42.
Thursday
Sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 ft)
Last Update:
2:08 pm EST Nov 12, 2026
Forecast Valid:
3pm EST Nov 12, 2026-6pm EST Nov 19, 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