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.

A Few Clouds

38°F

3°C

Humidity 33%
Wind Speed N 14 mph
Barometer 30.24 in (1023.9 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 1 Mar 3:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Tonight

    Tonight: Mostly clear, with a low around 19. Wind chill values between 10 and 15. North wind around 11 mph.

    Low: 19 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 29. Wind chill values between 10 and 20. North wind 5 to 8 mph becoming calm in the afternoon.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 22. Light south wind.

    Low: 22 °F

    Mostly Clear

  • Tuesday

    Tuesday: Rain, possibly mixed with snow, becoming all rain after 4pm. High near 40. Southeast wind 3 to 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 40 °F

    Rain/Snow
    Likely then
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain. Low around 35. South wind around 6 mph becoming west in the evening. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Cloudy, with a high near 52.

    High: 52 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain. Cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 19. Wind chill values between 10 and 15. North wind around 11 mph.
Monday
Mostly sunny, with a high near 29. Wind chill values between 10 and 20. North wind 5 to 8 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 22. Light south wind.
Tuesday
Rain, possibly mixed with snow, becoming all rain after 4pm. High near 40. Southeast wind 3 to 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Tuesday Night
Rain. Low around 35. South wind around 6 mph becoming west in the evening. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
A 50 percent chance of rain. Cloudy, with a low around 37.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 52.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 38.
Friday
A 40 percent chance of rain before 1pm. Cloudy, with a high near 44.
Friday Night
Cloudy, with a low around 36.
Saturday
Cloudy, with a high near 52.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 41.
Sunday
Mostly cloudy, with a high near 52.
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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:
3:08 pm EST Mar 1, 2026
Forecast Valid:
4pm EST Mar 1, 2026-6pm EDT Mar 8, 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