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

44°F

7°C

Humidity 73%
Wind Speed NW 15 mph
Barometer 29.74 in (1007.1 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 12 Mar 11:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: Rain before 4pm, then snow, possibly mixed with rain. Temperature falling to around 37 by 5pm. Northwest wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.

    High: 53 °F⇓

    Rain/Snow

  • Tonight

    Tonight: Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 31. Northwest wind 10 to 13 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 31 °F

    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 45. West wind 6 to 15 mph becoming south in the afternoon.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 38. South wind 14 to 18 mph.

    Low: 38 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 49. West wind around 17 mph.

    High: 49 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 33.

    Low: 33 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, with a high near 49.

    High: 49 °F

    Cloudy

  • Sunday Night

    Sunday Night: Rain, mainly after 2am. Low around 41. Chance of precipitation is 80%.

    Low: 41 °F

    Chance Rain
    then Rain

  • Monday

    Monday: Rain. High near 57. Breezy. Chance of precipitation is 90%.

    High: 57 °F

    Rain and
    Breezy

Detailed Forecast

This Afternoon
Rain before 4pm, then snow, possibly mixed with rain. Temperature falling to around 37 by 5pm. Northwest wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 31. Northwest wind 10 to 13 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Friday
Increasing clouds, with a high near 45. West wind 6 to 15 mph becoming south in the afternoon.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 38. South wind 14 to 18 mph.
Saturday
Sunny, with a high near 49. West wind around 17 mph.
Saturday Night
Increasing clouds, with a low around 33.
Sunday
Cloudy, with a high near 49.
Sunday Night
Rain, mainly after 2am. Low around 41. Chance of precipitation is 80%.
Monday
Rain. High near 57. Breezy. Chance of precipitation is 90%.
Monday Night
Rain likely, mainly before 2am. Mostly cloudy, with a low around 33. Breezy. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 42.
Tuesday Night
Partly cloudy, with a low around 26.
Wednesday
Mostly sunny, with a high near 39.
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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:
11:29 am EDT Mar 12, 2026
Forecast Valid:
12pm EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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