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.

Fog/Mist

35°F

2°C

Humidity 96%
Wind Speed Calm
Barometer 30.36 in (1028.3 mb)
Dewpoint 34°F (1°C)
Visibility 1.00 mi
Last update 7 Mar 1:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Areas of drizzle after 4am. Patchy fog. Otherwise, cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Areas Drizzle
    and Patchy
    Fog

  • Saturday

    Saturday: Areas of drizzle before 1pm. Patchy fog. Otherwise, cloudy, with a high near 45. Calm wind becoming south 5 to 8 mph in the morning.

    High: 45 °F

    Areas Drizzle
    and Patchy
    Fog

  • Saturday Night

    Saturday Night: A 50 percent chance of showers after 10pm. Areas of fog before 1am. Otherwise, cloudy, with a temperature rising to around 49 by 5am. South wind 8 to 10 mph.

    Low: 41 °F⇑

    Chance
    Showers and
    Areas Fog

  • Sunday

    Sunday: A 30 percent chance of rain, mainly before 1pm. Mostly cloudy, with a high near 58. Southwest wind around 10 mph.

    High: 58 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. West wind around 6 mph.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °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 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Areas of drizzle after 4am. Patchy fog. Otherwise, cloudy, with a low around 34. Calm wind.
Saturday
Areas of drizzle before 1pm. Patchy fog. Otherwise, cloudy, with a high near 45. Calm wind becoming south 5 to 8 mph in the morning.
Saturday Night
A 50 percent chance of showers after 10pm. Areas of fog before 1am. Otherwise, cloudy, with a temperature rising to around 49 by 5am. South wind 8 to 10 mph.
Sunday
A 30 percent chance of rain, mainly before 1pm. Mostly cloudy, with a high near 58. Southwest wind around 10 mph.
Sunday Night
Mostly clear, with a low around 38. West wind around 6 mph.
Monday
Sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 43.
Wednesday
A 40 percent chance of rain. Cloudy, with a high near 56.
Wednesday Night
Rain likely. Cloudy, with a low around 44. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Cloudy, with a high near 53.
Thursday Night
Partly cloudy, with a low around 30.
Friday
Partly sunny, with a high near 44.
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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:
1:06 am EST Mar 7, 2026
Forecast Valid:
2am 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