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.

Light Drizzle Fog/Mist

39°F

4°C

Humidity 96%
Wind Speed S 5 mph
Barometer 30.24 in (1023.9 mb)
Dewpoint 38°F (3°C)
Visibility 1.00 mi
Wind Chill35°F (2°C)
Last update 7 Mar 9:56 am EST
Extended Forecast for

Stony Brook NY

  • Today

    Today: Areas of drizzle before 1pm. Patchy fog. Otherwise, cloudy, with a high near 45. South wind 5 to 8 mph.

    High: 45 °F

    Areas Drizzle
    and Patchy
    Fog

  • Tonight

    Tonight: A 50 percent chance of showers after 10pm. Areas of fog before 1am. Otherwise, cloudy, with a temperature rising to around 48 by 5am. South wind 7 to 10 mph.

    Low: 41 °F⇑

    Chance
    Showers and
    Areas Fog

  • Sunday

    Sunday: A 40 percent chance of rain, mainly before 1pm. Mostly cloudy, with a high near 58. Southwest wind 8 to 10 mph.

    High: 58 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. West wind 3 to 6 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain. Cloudy, with a high near 56.

    High: 56 °F

    Chance Rain

Detailed Forecast

Today
Areas of drizzle before 1pm. Patchy fog. Otherwise, cloudy, with a high near 45. South wind 5 to 8 mph.
Tonight
A 50 percent chance of showers after 10pm. Areas of fog before 1am. Otherwise, cloudy, with a temperature rising to around 48 by 5am. South wind 7 to 10 mph.
Sunday
A 40 percent chance of rain, mainly before 1pm. Mostly cloudy, with a high near 58. Southwest wind 8 to 10 mph.
Sunday Night
Mostly clear, with a low around 37. West wind 3 to 6 mph.
Monday
Sunny, with a high near 57. Calm wind becoming southwest 5 to 9 mph in the morning.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 42.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 56.
Wednesday Night
Rain likely, mainly after 1am. Cloudy, with a low around 43. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Cloudy, with a high near 52.
Thursday Night
Partly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 43.
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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:
2:47 am EST Mar 7, 2026
Forecast Valid:
11am EST Mar 7, 2026-6pm EDT Mar 13, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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