National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

41°F

5°C

Humidity 73%
Wind Speed E 14 mph
Barometer 30.36 in (1028.1 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 15 Mar 6:56 pm EDT
Extended Forecast for

Smithtown NY

Wind Advisory March 16, 02:00pm until March 17, 04:00am
Click here for hazard details and duration
Wind Advisory

  • Tonight

    Tonight: Showers, with thunderstorms also possible after 5am. Temperature falling to near 40 by 9pm, then rising to around 48 during the remainder of the night. Southeast wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 40 °F⇑

    Slight Chance
    Showers then
    Showers

  • Monday

    Monday: Showers and possibly a thunderstorm. Patchy fog. High near 59. South wind 14 to 18 mph, with gusts as high as 38 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 59 °F

    Showers and
    Patchy Fog

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 34. Breezy, with a south wind 17 to 22 mph, with gusts as high as 48 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 34 °F

    Showers and
    Breezy

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 43. West wind 14 to 16 mph, with gusts as high as 29 mph.

    High: 43 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 25. West wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 25 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a high near 39.

    High: 39 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers, with thunderstorms also possible after 5am. Temperature falling to near 40 by 9pm, then rising to around 48 during the remainder of the night. Southeast wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm. Patchy fog. High near 59. South wind 14 to 18 mph, with gusts as high as 38 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 34. Breezy, with a south wind 17 to 22 mph, with gusts as high as 48 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 43. West wind 14 to 16 mph, with gusts as high as 29 mph.
Tuesday Night
Partly cloudy, with a low around 25. West wind 10 to 14 mph, with gusts as high as 24 mph.
Wednesday
Increasing clouds, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 33.
Friday
Mostly sunny, with a high near 50.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 36.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 51.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithtown NY
 40.88°N 73.21°W (Elev. 85 ft)
Last Update:
2:22 pm EDT Mar 15, 2026
Forecast Valid:
7pm EDT Mar 15, 2026-6pm EDT Mar 22, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation