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

48°F

9°C

Humidity 48%
Wind Speed W 7 mph
Barometer 29.90 in (1012.5 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 14 Nov 9:56 pm EST
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Partly cloudy, with a low around 33. North wind 6 to 8 mph.

    Low: 33 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after 4pm. Areas of frost before 8am. Otherwise, increasing clouds, with a high near 56. North wind 6 to 9 mph becoming southwest in the afternoon.

    High: 56 °F

    Areas Frost
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers, mainly between 7pm and 1am. Low around 48. Southwest wind 10 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Showers

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a temperature rising to near 58 by 10am, then falling to around 49 during the remainder of the day. Breezy, with a west wind 14 to 21 mph, with gusts as high as 34 mph.

    High: 58 °F⇓

    Gradual
    Clearing and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35. West wind 16 to 18 mph, with gusts as high as 37 mph.

    Low: 35 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 47. Breezy.

    High: 47 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 33. North wind 6 to 8 mph.
Saturday
A 20 percent chance of showers after 4pm. Areas of frost before 8am. Otherwise, increasing clouds, with a high near 56. North wind 6 to 9 mph becoming southwest in the afternoon.
Saturday Night
Showers, mainly between 7pm and 1am. Low around 48. Southwest wind 10 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Cloudy through mid morning, then gradual clearing, with a temperature rising to near 58 by 10am, then falling to around 49 during the remainder of the day. Breezy, with a west wind 14 to 21 mph, with gusts as high as 34 mph.
Sunday Night
Partly cloudy, with a low around 35. West wind 16 to 18 mph, with gusts as high as 37 mph.
Monday
Mostly sunny, with a high near 47. Breezy.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Partly cloudy, with a low around 34.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Partly cloudy, with a low around 35.
Thursday
Partly sunny, with a high near 52.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 41.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
10:06 pm EST Nov 14, 2025
Forecast Valid:
10pm EST Nov 14, 2025-6pm EST Nov 21, 2025
 
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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