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

46°F

8°C

Humidity 58%
Wind Speed W 7 mph
Barometer 30.00 in (1015.9 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 24 Nov 12:56 am EST
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Mostly clear, with a low around 38. Northwest wind around 10 mph, with gusts as high as 26 mph.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 52. Northwest wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 36. Light southwest wind.

    Low: 36 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of rain after 1pm. Cloudy, with a high near 57. Southwest wind 6 to 10 mph.

    High: 57 °F

    Cloudy then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Rain. Temperature rising to around 54 by 1am. South wind around 8 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 50 °F⇑

    Rain

  • Wednesday

    Wednesday: Rain likely, mainly before 1pm. Cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 61 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 46. Breezy.

    High: 46 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31. Breezy.

    Low: 31 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 38. Northwest wind around 10 mph, with gusts as high as 26 mph.
Monday
Sunny, with a high near 52. Northwest wind 6 to 11 mph, with gusts as high as 21 mph.
Monday Night
Partly cloudy, with a low around 36. Light southwest wind.
Tuesday
A 40 percent chance of rain after 1pm. Cloudy, with a high near 57. Southwest wind 6 to 10 mph.
Tuesday Night
Rain. Temperature rising to around 54 by 1am. South wind around 8 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Rain likely, mainly before 1pm. Cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 38.
Thanksgiving Day
Mostly sunny, with a high near 46. Breezy.
Thursday Night
Mostly clear, with a low around 31. Breezy.
Friday
Mostly sunny, with a high near 44. Breezy.
Friday Night
Mostly clear, with a low around 31.
Saturday
Sunny, with a high near 43.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Mostly cloudy, with a high near 52.
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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:
1:01 am EST Nov 24, 2025
Forecast Valid:
1am EST Nov 24, 2025-6pm EST Nov 30, 2025
 
Forecast Discussion
 
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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