Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast and Breezy

48°F

9°C

Humidity 66%
Wind Speed E 21 G 29 mph
Barometer 30.26 in (1024.8 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 4 Apr 5:56 pm EDT
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: A chance of showers between 11pm and 2am, then areas of drizzle with a chance of showers after 2am. The drizzle could be heavy at times.  Areas of dense fog after 2am.  Otherwise, cloudy, with a low around 42. East wind 9 to 16 mph, with gusts as high as 26 mph.  Chance of precipitation is 50%.

    Low: 42 °F

    Chance
    Showers and
    Areas Dense
    Fog

  • Sunday

    Sunday: Areas of drizzle with a chance of showers before 11am, then showers, mainly between 11am and 5pm. The drizzle could be heavy at times.  Areas of dense fog before 11am. High near 60. Southwest wind 10 to 15 mph.  Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers and
    Areas Dense
    Fog

  • Sunday Night

    Sunday Night: A 30 percent chance of showers, mainly before 8pm.  Cloudy during the early evening, then gradual clearing, with a low around 40. Northwest wind around 11 mph.

    Low: 40 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 54. West wind around 11 mph.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain.  Partly cloudy, with a low around 39. West wind around 6 mph.

    Low: 39 °F

    Slight Chance
    Rain

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 47.

    High: 47 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers between 11pm and 2am, then areas of drizzle with a chance of showers after 2am. The drizzle could be heavy at times. Areas of dense fog after 2am. Otherwise, cloudy, with a low around 42. East wind 9 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
Sunday
Areas of drizzle with a chance of showers before 11am, then showers, mainly between 11am and 5pm. The drizzle could be heavy at times. Areas of dense fog before 11am. High near 60. Southwest wind 10 to 15 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
A 30 percent chance of showers, mainly before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 40. Northwest wind around 11 mph.
Monday
Sunny, with a high near 54. West wind around 11 mph.
Monday Night
A 20 percent chance of rain. Partly cloudy, with a low around 39. West wind around 6 mph.
Tuesday
Mostly sunny, with a high near 51.
Tuesday Night
Mostly clear, with a low around 31.
Wednesday
Sunny, with a high near 47.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Mostly sunny, with a high near 55.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 44.
Saturday
Mostly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
2:50 pm EDT Apr 4, 2026
6pm EDT Apr 4, 2026-6pm EDT Apr 11, 2026
 
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Additional Resources

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