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

43°F

6°C

Humidity 82%
Wind Speed S 8 mph
Barometer 30.18 in (1022.0 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 25 Mar 11:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 20 percent chance of rain after 2am. Cloudy, with a steady temperature around 43. South wind around 11 mph.

    Low: 43 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 57. Southwest wind 13 to 16 mph, with gusts as high as 26 mph.

    High: 57 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Showers, mainly after 2am. Low around 46. Southwest wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Slight Chance
    Showers then
    Showers

  • Friday

    Friday: Showers, mainly before 2pm. High near 52. North wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Showers

  • Friday Night

    Friday Night: A chance of rain showers before 11pm, then a slight chance of rain and snow showers between 11pm and 2am, then a slight chance of snow showers after 2am. Mostly cloudy, with a low around 30. North wind around 8 mph. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 46.

    High: 46 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of rain after 2am. Cloudy, with a steady temperature around 43. South wind around 11 mph.
Thursday
Cloudy, then gradually becoming mostly sunny, with a high near 57. Southwest wind 13 to 16 mph, with gusts as high as 26 mph.
Thursday Night
Showers, mainly after 2am. Low around 46. Southwest wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Showers, mainly before 2pm. High near 52. North wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A chance of rain showers before 11pm, then a slight chance of rain and snow showers between 11pm and 2am, then a slight chance of snow showers after 2am. Mostly cloudy, with a low around 30. North wind around 8 mph. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Partly cloudy, with a low around 28.
Sunday
Sunny, with a high near 46.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly cloudy, with a high near 53.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly cloudy, with a high near 53.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 38.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 53.
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Forecast Area
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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:
11:15 pm EDT Mar 25, 2026
Forecast Valid:
12am EDT Mar 26, 2026-6pm EDT Apr 1, 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