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

50°F

10°C

Humidity 96%
Wind Speed SW 13 G 28 mph
Barometer 30.06 in (1017.9 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 9 Jan 8:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Scattered showers, mainly before 10pm. Mostly cloudy, with a low around 39. Southwest wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 40%.

    Low: 39 °F

    Scattered
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Rain, mainly after 1pm. High near 45. Calm wind becoming northeast around 6 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 45 °F

    Slight Chance
    Rain then
    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 38. East wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 38 °F

    Rain

  • Sunday

    Sunday: A 30 percent chance of rain, mainly before 1pm. Partly sunny, with a high near 45. West wind 7 to 16 mph.

    High: 45 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 27. West wind around 15 mph, with gusts as high as 30 mph.

    Low: 27 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

  • Monday Night

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

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Scattered showers, mainly before 10pm. Mostly cloudy, with a low around 39. Southwest wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 40%.
Saturday
Rain, mainly after 1pm. High near 45. Calm wind becoming northeast around 6 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Rain. Low around 38. East wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 30 percent chance of rain, mainly before 1pm. Partly sunny, with a high near 45. West wind 7 to 16 mph.
Sunday Night
Partly cloudy, with a low around 27. West wind around 15 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
Mostly cloudy, with a high near 39.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 22. Chance of precipitation is 30%.
Friday
Partly sunny, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
6:02 pm EST Jan 9, 2026
Forecast Valid:
9pm EST Jan 9, 2026-6pm EST Jan 16, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation