National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Light Drizzle

50°F

10°C

Humidity 89%
Wind Speed SE 12 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 47°F (8°C)
Visibility 8.00 mi
Wind Chill45°F (7°C)
Last update 18 Apr 7:56 pm EDT
Extended Forecast for

Islip NY

  • Tonight

    Tonight: A 30 percent chance of showers after 5am. Patchy fog. Otherwise, cloudy, with a low around 47. Southeast wind 5 to 9 mph.

    Low: 47 °F

    Patchy Fog
    then Chance
    Showers and
    Areas Fog

  • Sunday

    Sunday: Showers, mainly before 5pm. Patchy fog before 8am. High near 56. South wind 6 to 15 mph becoming northwest in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40. Northwest wind around 6 mph.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers. Mostly sunny, with a high near 52. Northwest wind 7 to 10 mph.

    High: 52 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 34. North wind around 8 mph.

    Low: 34 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 40.

    Low: 40 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of showers after 5am. Patchy fog. Otherwise, cloudy, with a low around 47. Southeast wind 5 to 9 mph.
Sunday
Showers, mainly before 5pm. Patchy fog before 8am. High near 56. South wind 6 to 15 mph becoming northwest in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Partly cloudy, with a low around 40. Northwest wind around 6 mph.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 52. Northwest wind 7 to 10 mph.
Monday Night
Partly cloudy, with a low around 34. North wind around 8 mph.
Tuesday
Sunny, with a high near 50.
Tuesday Night
Increasing clouds, with a low around 40.
Wednesday
Mostly cloudy, with a high near 59.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Sunny, with a high near 62.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 46.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
6:34 pm EDT Apr 18, 2026
Forecast Valid:
8pm EDT Apr 18, 2026-6pm EDT Apr 25, 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