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.

Partly Cloudy

49°F

9°C

Humidity 35%
Wind Speed W 12 G 21 mph
Barometer 29.87 in (1011.6 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 27 Nov 12:56 pm EST
Extended Forecast for

Smithtown NY

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 48. West wind around 14 mph, with gusts as high as 26 mph.

    High: 48 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. Wind chill values between 20 and 25. West wind 10 to 13 mph, with gusts as high as 25 mph.

    Low: 30 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 42. Wind chill values between 20 and 30. West wind 13 to 18 mph, with gusts as high as 39 mph.

    High: 42 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 30. Wind chill values between 20 and 25. West wind 11 to 17 mph, with gusts as high as 36 mph.

    Low: 30 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 42. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 42 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain likely after 1pm. Cloudy, with a high near 51. Chance of precipitation is 60%.

    High: 51 °F

    Cloudy then
    Rain Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain

  • Monday

    Monday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

Detailed Forecast

Thanksgiving Day
Mostly sunny, with a high near 48. West wind around 14 mph, with gusts as high as 26 mph.
Tonight
Mostly clear, with a low around 30. Wind chill values between 20 and 25. West wind 10 to 13 mph, with gusts as high as 25 mph.
Friday
Mostly sunny, with a high near 42. Wind chill values between 20 and 30. West wind 13 to 18 mph, with gusts as high as 39 mph.
Friday Night
Mostly clear, with a low around 30. Wind chill values between 20 and 25. West wind 11 to 17 mph, with gusts as high as 36 mph.
Saturday
Sunny, with a high near 42. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.
Saturday Night
Increasing clouds, with a low around 32.
Sunday
Rain likely after 1pm. Cloudy, with a high near 51. Chance of precipitation is 60%.
Sunday Night
A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 34.
Monday
Partly sunny, with a high near 43.
Monday Night
Mostly cloudy, with a low around 29.
Tuesday
Rain likely. Cloudy, with a high near 44. Chance of precipitation is 60%.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 31.
Wednesday
Partly sunny, with a high near 41.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithtown NY
 40.86°N 73.19°W (Elev. 98 ft)
Last Update:
1:01 pm EST Nov 27, 2025
Forecast Valid:
1pm EST Nov 27, 2025-6pm EST Dec 3, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation