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

32°F

0°C

Humidity 66%
Wind Speed Calm
Barometer 30.49 in (1032.6 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Last update 29 Nov 11:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Cloudy, with a temperature rising to around 37 by 5am. Light southeast wind.

    Low: 32 °F⇑

    Cloudy

  • Sunday

    Sunday: Rain, mainly after 1pm. High near 53. South wind 7 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 34. West wind around 10 mph, with gusts as high as 23 mph.

    Low: 34 °F

    Slight Chance
    Rain then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 44. Northwest wind 8 to 11 mph, with gusts as high as 23 mph.

    High: 44 °F

    Sunny

  • Monday Night

    Monday Night: A 50 percent chance of rain after 4am. Increasing clouds, with a low around 30. Light and variable wind.

    Low: 30 °F

    Partly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: Rain, mainly after 7am. High near 47. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

    High: 47 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain likely before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Chance of precipitation is 60%.

    Low: 31 °F

    Rain Likely

  • Wednesday

    Wednesday: Sunny, with a high near 44.

    High: 44 °F

    Sunny

  • Wednesday Night

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

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Overnight
Cloudy, with a temperature rising to around 37 by 5am. Light southeast wind.
Sunday
Rain, mainly after 1pm. High near 53. South wind 7 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 20 percent chance of rain before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 34. West wind around 10 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 44. Northwest wind 8 to 11 mph, with gusts as high as 23 mph.
Monday Night
A 50 percent chance of rain after 4am. Increasing clouds, with a low around 30. Light and variable wind.
Tuesday
Rain, mainly after 7am. High near 47. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Tuesday Night
Rain likely before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Chance of precipitation is 60%.
Wednesday
Sunny, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 41.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Saturday
A 30 percent chance of rain. Mostly cloudy, with a high near 43.
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Forecast Area
Tiles ©ESRI

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 29, 2025
Forecast Valid:
12am EST Nov 30, 2025-6pm EST Dec 6, 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