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

33°F

1°C

Humidity 54%
Wind Speed W 13 G 22 mph
Barometer 30.17 in (1021.6 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 12 Jan 8:56 am EST
Extended Forecast for

Central Islip NY

  • Today

    Today: Mostly sunny, with a high near 40. Wind chill values between 25 and 35. Southwest wind 11 to 13 mph, with gusts as high as 24 mph.

    High: 40 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. West wind around 7 mph.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 44. West wind 6 to 9 mph.

    High: 44 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 40. South wind around 8 mph, with gusts as high as 20 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 47. Southwest wind 6 to 9 mph.

    High: 47 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers. Cloudy, with a low around 33.

    Low: 33 °F

    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of rain. Mostly cloudy, with a high near 43.

    High: 43 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 22.

    Low: 22 °F

    Chance Snow

  • Friday

    Friday: A 30 percent chance of snow before 1pm. Partly sunny, with a high near 34.

    High: 34 °F

    Chance Snow

Detailed Forecast

Today
Mostly sunny, with a high near 40. Wind chill values between 25 and 35. Southwest wind 11 to 13 mph, with gusts as high as 24 mph.
Tonight
Mostly clear, with a low around 30. West wind around 7 mph.
Tuesday
Mostly sunny, with a high near 44. West wind 6 to 9 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 40. South wind around 8 mph, with gusts as high as 20 mph.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 47. Southwest wind 6 to 9 mph.
Wednesday Night
A 30 percent chance of showers. Cloudy, with a low around 33.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 43.
Thursday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 22.
Friday
A 30 percent chance of snow before 1pm. Partly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 40.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
A 30 percent chance of snow showers. Partly sunny, with a high near 37.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Central Islip NY
 40.79°N 73.2°W (Elev. 98 ft)
Last Update:
5:36 am EST Jan 12, 2026
Forecast Valid:
9am EST Jan 12, 2026-6pm EST Jan 18, 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