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.

Overcast

42°F

6°C

Humidity 89%
Wind Speed W 8 mph
Barometer 30.08 in (1018.7 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 30 Nov 11:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Partly cloudy, with a low around 35. West wind around 16 mph.

    Low: 35 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 44. Northwest wind 10 to 16 mph.

    High: 44 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 30. North wind around 6 mph becoming calm in the evening.

    Low: 30 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Rain. High near 48. Southeast wind 6 to 14 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

    High: 48 °F

    Rain

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 29. Northwest wind around 14 mph.

    Low: 29 °F

    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 41.

    High: 41 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 44. Breezy.

    High: 44 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 35. West wind around 16 mph.
Monday
Sunny, with a high near 44. Northwest wind 10 to 16 mph.
Monday Night
Increasing clouds, with a low around 30. North wind around 6 mph becoming calm in the evening.
Tuesday
Rain. High near 48. Southeast wind 6 to 14 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Tuesday Night
A 40 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 29. Northwest wind around 14 mph.
Wednesday
Sunny, with a high near 41.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 44. Breezy.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 37.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 27. Chance of precipitation is 50%.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 45.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30.
Sunday
Partly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
5:44 pm EST Nov 30, 2025
Forecast Valid:
12am EST Dec 1, 2025-6pm EST Dec 7, 2025
 
Forecast Discussion
 
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Additional Resources

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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