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

35°F

2°C

Humidity 85%
Wind Speed E 8 mph
Barometer 29.99 in (1015.6 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 20 Feb 2:56 am EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 32. East wind around 8 mph.

    Low: 32 °F

    Mostly Cloudy

  • Friday

    Friday: Rain, mainly after 7am. High near 40. East wind 9 to 14 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 40 °F

    Rain

  • Friday Night

    Friday Night: Rain likely, mainly before 7pm. Mostly cloudy, with a low around 32. Northeast wind 6 to 8 mph becoming west after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 32 °F

    Rain Likely
    then Mostly
    Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 43. West wind around 7 mph.

    High: 43 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of rain and snow before 1am, then a slight chance of snow. Cloudy, with a low around 31. East wind 5 to 8 mph. Chance of precipitation is 20%.

    Low: 31 °F

    Slight Chance
    Rain/Snow

  • Sunday

    Sunday: A 50 percent chance of snow. Cloudy, with a high near 37.

    High: 37 °F

    Chance Snow

  • Sunday Night

    Sunday Night: Snow likely. Cloudy, with a low around 30. Blustery. Chance of precipitation is 70%.

    Low: 30 °F

    Snow Likely
    and Blustery

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Cloudy, with a high near 35. Breezy.

    High: 35 °F

    Chance Snow
    and Breezy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 32. East wind around 8 mph.
Friday
Rain, mainly after 7am. High near 40. East wind 9 to 14 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain likely, mainly before 7pm. Mostly cloudy, with a low around 32. Northeast wind 6 to 8 mph becoming west after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Partly sunny, with a high near 43. West wind around 7 mph.
Saturday Night
A slight chance of rain and snow before 1am, then a slight chance of snow. Cloudy, with a low around 31. East wind 5 to 8 mph. Chance of precipitation is 20%.
Sunday
A 50 percent chance of snow. Cloudy, with a high near 37.
Sunday Night
Snow likely. Cloudy, with a low around 30. Blustery. Chance of precipitation is 70%.
Monday
A 40 percent chance of snow before 1pm. Cloudy, with a high near 35. Breezy.
Monday Night
Mostly cloudy, with a low around 26.
Tuesday
Mostly sunny, with a high near 36.
Tuesday Night
Mostly cloudy, with a low around 24.
Wednesday
Mostly cloudy, with a high near 41.
Wednesday Night
Rain likely. Cloudy, with a low around 34. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, 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:
1:01 am EST Feb 20, 2026
Forecast Valid:
3am EST Feb 20, 2026-6pm EST Feb 26, 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