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

46°F

8°C

Humidity 46%
Wind Speed S 8 mph
Barometer 30.39 in (1029.1 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 25 Mar 11:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 49. South wind 5 to 8 mph.

    High: 49 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 39. South wind 5 to 11 mph.

    Low: 39 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 55. Southwest wind 8 to 14 mph, with gusts as high as 24 mph.

    High: 55 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Rain, mainly after 2am. Low around 45. Southwest wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Chance Rain
    then Rain

  • Friday

    Friday: Rain, mainly before 8am. High near 50. North wind 7 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 50 °F

    Rain then
    Chance Rain

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Saturday Night

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

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 46.

    High: 46 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 49. South wind 5 to 8 mph.
Tonight
Mostly cloudy, with a low around 39. South wind 5 to 11 mph.
Thursday
Partly sunny, with a high near 55. Southwest wind 8 to 14 mph, with gusts as high as 24 mph.
Thursday Night
Rain, mainly after 2am. Low around 45. Southwest wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain, mainly before 8am. High near 50. North wind 7 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Mostly cloudy, with a low around 29.
Saturday
Sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Sunny, with a high near 46.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Partly sunny, with a high near 51.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Partly sunny, with a high near 55.
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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:
2:27 am EDT Mar 25, 2026
Forecast Valid:
12pm EDT Mar 25, 2026-6pm EDT Mar 31, 2026
 
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