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.

Overcast

37°F

3°C

Humidity 89%
Wind Speed Calm
Barometer 30.22 in (1023.3 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 5 Mar 5:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Today

    Today: Rain, mainly after 7am. Patchy fog. High near 39. Calm wind becoming east 5 to 9 mph in the morning. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 39 °F

    Rain and
    Patchy Fog

  • Tonight

    Tonight: Rain, mainly before 4am. Patchy fog. Low around 34. East wind 11 to 16 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 34 °F

    Rain and
    Patchy Fog

  • Friday

    Friday: A 30 percent chance of rain, mainly before 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 41. Northeast wind 9 to 14 mph.

    High: 41 °F

    Chance Rain
    and Patchy
    Fog

  • Friday Night

    Friday Night: A 20 percent chance of rain after 1am. Cloudy, with a low around 35. Northeast wind 5 to 7 mph becoming calm after midnight.

    Low: 35 °F

    Cloudy then
    Slight Chance
    Rain

  • Saturday

    Saturday: Cloudy, with a high near 49. Calm wind becoming south 5 to 7 mph in the morning.

    High: 49 °F

    Cloudy

  • Saturday Night

    Saturday Night: Showers likely. Cloudy, with a temperature rising to around 47 by 4am. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F⇑

    Showers
    Likely

  • Sunday

    Sunday: Partly sunny, with a high near 54.

    High: 54 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
Rain, mainly after 7am. Patchy fog. High near 39. Calm wind becoming east 5 to 9 mph in the morning. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Rain, mainly before 4am. Patchy fog. Low around 34. East wind 11 to 16 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
A 30 percent chance of rain, mainly before 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 41. Northeast wind 9 to 14 mph.
Friday Night
A 20 percent chance of rain after 1am. Cloudy, with a low around 35. Northeast wind 5 to 7 mph becoming calm after midnight.
Saturday
Cloudy, with a high near 49. Calm wind becoming south 5 to 7 mph in the morning.
Saturday Night
Showers likely. Cloudy, with a temperature rising to around 47 by 4am. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Partly sunny, with a high near 54.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 44.
Wednesday
A 30 percent chance of rain. Cloudy, with a high near 56.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
6:25 am EST Mar 5, 2026
Forecast Valid:
6am EST Mar 5, 2026-6pm EDT Mar 11, 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