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

58°F

14°C

Humidity 70%
Wind Speed NE 15 mph
Barometer 30.18 in (1022.0 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 1 Apr 8:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Showers, mainly before 5am. Low around 41. Northeast wind 10 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Showers

  • Thursday

    Thursday: A 40 percent chance of showers, mainly before 11am. Cloudy, with a high near 46. Northeast wind around 14 mph, with gusts as high as 25 mph.

    High: 46 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 8pm. Cloudy, with a low around 39. East wind 5 to 9 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Slight Chance
    Showers

  • Friday

    Friday: Mostly cloudy, with a high near 58. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 58 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 50. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.

    Low: 50 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers. High near 58. Chance of precipitation is 80%.

    High: 58 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 8pm. Low around 39. Chance of precipitation is 80%.

    Low: 39 °F

    Showers then
    Chance
    Showers

Detailed Forecast

Tonight
Showers, mainly before 5am. Low around 41. Northeast wind 10 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
A 40 percent chance of showers, mainly before 11am. Cloudy, with a high near 46. Northeast wind around 14 mph, with gusts as high as 25 mph.
Thursday Night
A 20 percent chance of showers after 8pm. Cloudy, with a low around 39. East wind 5 to 9 mph, with gusts as high as 20 mph.
Friday
Mostly cloudy, with a high near 58. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 50. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Mostly cloudy, with a low around 45.
Sunday
Showers. High near 58. Chance of precipitation is 80%.
Sunday Night
Showers, mainly before 8pm. Low around 39. Chance of precipitation is 80%.
Monday
Mostly sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Partly cloudy, with a low around 33.
Wednesday
Sunny, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
9:10 pm EDT Apr 1, 2026
Forecast Valid:
9pm EDT Apr 1, 2026-6pm EDT Apr 8, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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