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 6 to 13 mph becoming northwest after midnight. Chance of precipitation is 40%.

    Low: 39 °F

    Scattered
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Rain, mainly after 1pm. High near 46. Light and variable wind becoming east 5 to 9 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 46 °F

    Slight Chance
    Rain then
    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 38. East wind 6 to 9 mph becoming northwest 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 47. Breezy, with a west wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon.

    High: 47 °F

    Chance Rain
    and Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28. West wind around 18 mph, with gusts as high as 31 mph.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 41.

    High: 41 °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 45.

    High: 45 °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 6 to 13 mph becoming northwest after midnight. Chance of precipitation is 40%.
Saturday
Rain, mainly after 1pm. High near 46. Light and variable wind becoming east 5 to 9 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 6 to 9 mph becoming northwest 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 47. Breezy, with a west wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 28. West wind around 18 mph, with gusts as high as 31 mph.
Monday
Sunny, with a high near 41.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Mostly cloudy, with a high near 41.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 23. Chance of precipitation is 30%.
Friday
Partly sunny, with a high near 35.
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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:
6:02 pm EST Jan 9, 2026
Forecast Valid:
9pm EST Jan 9, 2026-6pm EST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation