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.

Mostly Cloudy

63°F

17°C

Humidity 73%
Wind Speed E 5 mph
Barometer 30.13 in (1020.1 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 21 Sep 7:56 pm EDT
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 57. Northeast wind 8 to 10 mph.

    Low: 57 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 68. Northeast wind 14 to 17 mph.

    High: 68 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 56. Northeast wind 16 to 18 mph.

    Low: 56 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 68. Breezy, with a northeast wind 20 to 22 mph, with gusts as high as 33 mph.

    High: 68 °F

    Partly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. Northeast wind around 18 mph, with gusts as high as 30 mph.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 67. Breezy.

    High: 67 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Chance
    Showers

  • Friday

    Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 67. Breezy.

    High: 67 °F

    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 54. Breezy.

    Low: 54 °F

    Chance
    Showers and
    Breezy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 57. Northeast wind 8 to 10 mph.
Tuesday
Mostly cloudy, with a high near 68. Northeast wind 14 to 17 mph.
Tuesday Night
Mostly cloudy, with a low around 56. Northeast wind 16 to 18 mph.
Wednesday
Partly sunny, with a high near 68. Breezy, with a northeast wind 20 to 22 mph, with gusts as high as 33 mph.
Wednesday Night
Partly cloudy, with a low around 56. Northeast wind around 18 mph, with gusts as high as 30 mph.
Thursday
Mostly sunny, with a high near 67. Breezy.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 52.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 67. Breezy.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 54. Breezy.
Saturday
A 50 percent chance of showers. Mostly cloudy, with a high near 67. Breezy.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 54. Breezy.
Sunday
Partly sunny, with a high near 68.
Sunday Night
Mostly cloudy, with a low around 55.
Monday
Partly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:19 pm EDT Sep 21, 2026
Forecast Valid:
8pm EDT Sep 21, 2026-6pm EDT Sep 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