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.

Mostly Cloudy

43°F

6°C

Humidity 47%
Wind Speed NW 16 G 26 mph
Barometer 29.76 in
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 11 Jan 4:56 pm EST
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: A 30 percent chance of showers. Partly sunny, with a steady temperature around 40. West wind around 15 mph.

    High: 40 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers before 7pm. Partly cloudy, with a low around 30. Wind chill values between 20 and 25. Breezy, with a west wind 18 to 22 mph, with gusts as high as 37 mph.

    Low: 30 °F

    Breezy.
    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind 11 to 15 mph, with gusts as high as 28 mph.

    High: 41 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 32. Southwest wind 8 to 10 mph.

    Low: 32 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 44. West wind 7 to 9 mph.

    High: 44 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 47.

    High: 47 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain after 1am. Cloudy, with a low around 35.

    Low: 35 °F

    Cloudy then
    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Mostly cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

Detailed Forecast

This Afternoon
A 30 percent chance of showers. Partly sunny, with a steady temperature around 40. West wind around 15 mph.
Tonight
A 30 percent chance of showers before 7pm. Partly cloudy, with a low around 30. Wind chill values between 20 and 25. Breezy, with a west wind 18 to 22 mph, with gusts as high as 37 mph.
Monday
Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind 11 to 15 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 32. Southwest wind 8 to 10 mph.
Tuesday
Mostly sunny, with a high near 44. West wind 7 to 9 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 40.
Wednesday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 47.
Wednesday Night
A 40 percent chance of rain after 1am. Cloudy, with a low around 35.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
Thursday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Friday
Partly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 26.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 28.
Sunday
A chance of rain and snow. Partly sunny, with a high near 37.
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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:
1:42 pm EST Jan 11, 2026
Forecast Valid:
5pm EST Jan 11, 2026-6pm EST Jan 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