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.

Light Rain

44°F

7°C

Humidity 68%
Wind Speed S 9 mph
Barometer 30.23 in (1023.6 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 22 Apr 1:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 40 percent chance of showers. Cloudy, with a low around 40. South wind around 10 mph.

    Low: 40 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers, mainly before 11am. Cloudy, with a high near 52. South wind 10 to 15 mph.

    High: 52 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. Northeast wind around 5 mph becoming calm in the evening.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 67. Northwest wind 3 to 8 mph.

    High: 67 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 44. North wind 3 to 6 mph.

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of showers after 8am. Partly sunny, with a high near 52.

    High: 52 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 40 percent chance of showers. Cloudy, with a low around 40. South wind around 10 mph.
Wednesday
A 50 percent chance of showers, mainly before 11am. Cloudy, with a high near 52. South wind 10 to 15 mph.
Wednesday Night
Partly cloudy, with a low around 43. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 67. Northwest wind 3 to 8 mph.
Thursday Night
Mostly cloudy, with a low around 44. North wind 3 to 6 mph.
Friday
Partly sunny, with a high near 56.
Friday Night
Partly cloudy, with a low around 41.
Saturday
A 40 percent chance of showers after 8am. Partly sunny, with a high near 52.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 41.
Sunday
Partly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Partly sunny, with a high near 58.
Monday Night
Mostly cloudy, with a low around 45.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
3:50 pm EDT Apr 21, 2026
Forecast Valid:
2am EDT Apr 22, 2026-6pm EDT Apr 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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