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

43°F

6°C

Humidity 68%
Wind Speed W 9 mph
Barometer 30.06 in (1018.1 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 14 Nov 7:56 am EST
Extended Forecast for

Islip NYSimilar City Names

  • Today

    Today: Mostly sunny, with a high near 50. Northwest wind 10 to 13 mph.

    High: 50 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy frost after 1am. Otherwise, partly cloudy, with a low around 34. North wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 34 °F

    Partly Cloudy
    then Patchy
    Frost

  • Saturday

    Saturday: Patchy frost before 8am. Otherwise, increasing clouds, with a high near 55. Northwest wind 5 to 8 mph becoming southwest in the afternoon.

    High: 55 °F

    Patchy Frost
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Rain. Temperature rising to around 53 by 2am. Southwest wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 49 °F⇑

    Rain

  • Sunday

    Sunday: A 30 percent chance of rain before 1pm. Partly sunny, with a temperature rising to near 55 by 9am, then falling to around 48 during the remainder of the day. Breezy, with a west wind 13 to 20 mph, with gusts as high as 31 mph.

    High: 55 °F⇓

    Chance Rain
    and Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 50. Northwest wind 10 to 13 mph.
Tonight
Patchy frost after 1am. Otherwise, partly cloudy, with a low around 34. North wind 6 to 8 mph, with gusts as high as 20 mph.
Saturday
Patchy frost before 8am. Otherwise, increasing clouds, with a high near 55. Northwest wind 5 to 8 mph becoming southwest in the afternoon.
Saturday Night
Rain. Temperature rising to around 53 by 2am. Southwest wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 30 percent chance of rain before 1pm. Partly sunny, with a temperature rising to near 55 by 9am, then falling to around 48 during the remainder of the day. Breezy, with a west wind 13 to 20 mph, with gusts as high as 31 mph.
Sunday Night
Mostly clear, with a low around 36.
Monday
Mostly sunny, with a high near 48.
Monday Night
Mostly clear, with a low around 35.
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 34.
Thursday
Mostly sunny, with a high near 49.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NYSimilar City Names
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:06 am EST Nov 14, 2025
Forecast Valid:
8am EST Nov 14, 2025-6pm EST Nov 20, 2025
 
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