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.

Fair

53°F

12°C

Humidity 64%
Wind Speed S 7 mph
Barometer 29.99 in (1015.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 9 Mar 7:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 40. Southwest wind 3 to 6 mph.

    Low: 40 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 65. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 65 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 41. South wind around 6 mph becoming calm in the evening.

    Low: 41 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: A 20 percent chance of showers. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 59. South wind 5 to 10 mph.

    High: 59 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 48. South wind around 14 mph.

    Low: 48 °F

    Chance
    Showers

  • Thursday

    Thursday: Rain likely, mainly before 2pm. Mostly cloudy, with a temperature rising to near 51 by 10am, then falling to around 44 during the remainder of the day. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F⇓

    Rain Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 31.

    Low: 31 °F

    Chance Rain
    then Partly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain before 2am. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 40. Southwest wind 3 to 6 mph.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 65. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 41. South wind around 6 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 59. South wind 5 to 10 mph.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 48. South wind around 14 mph.
Thursday
Rain likely, mainly before 2pm. Mostly cloudy, with a temperature rising to near 51 by 10am, then falling to around 44 during the remainder of the day. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 31.
Friday
Mostly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain before 2am. Mostly cloudy, with a low around 36.
Saturday
Mostly sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 51.
Sunday Night
Rain likely. Mostly cloudy, with a low around 40. Breezy. Chance of precipitation is 70%.
Monday
Rain likely. Cloudy, with a high near 49. Chance of precipitation is 60%.
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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:
7:45 pm EDT Mar 9, 2026
Forecast Valid:
8pm EDT Mar 9, 2026-6pm EDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation