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

50°F

10°C

Humidity 57%
Wind Speed SW 12 mph
Barometer 29.90 in (1012.5 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 23 Nov 2:56 pm EST
Extended Forecast for

Central Islip NY

  • Tonight

    Tonight: Mostly clear, with a low around 38. West wind around 9 mph, with gusts as high as 26 mph.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50. Northwest wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 38. Light southwest wind.

    Low: 38 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 40 percent chance of rain after 1pm. Cloudy, with a high near 56. South wind 6 to 10 mph.

    High: 56 °F

    Cloudy then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Rain. Steady temperature around 50. Southwest wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 50 °F

    Rain

  • Wednesday

    Wednesday: A 30 percent chance of rain. Cloudy, with a high near 59.

    High: 59 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 38. West wind around 9 mph, with gusts as high as 26 mph.
Monday
Sunny, with a high near 50. Northwest wind 6 to 11 mph, with gusts as high as 21 mph.
Monday Night
Increasing clouds, with a low around 38. Light southwest wind.
Tuesday
A 40 percent chance of rain after 1pm. Cloudy, with a high near 56. South wind 6 to 10 mph.
Tuesday Night
Rain. Steady temperature around 50. Southwest wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A 30 percent chance of rain. Cloudy, with a high near 59.
Wednesday Night
A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 38.
Thanksgiving Day
Mostly sunny, with a high near 43.
Thursday Night
Mostly clear, with a low around 30.
Friday
Mostly sunny, with a high near 40. Breezy.
Friday Night
Mostly clear, with a low around 30.
Saturday
Mostly sunny, with a high near 43.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Central Islip NY
 40.77°N 73.21°W (Elev. 49 ft)
Last Update:
2:01 pm EST Nov 23, 2025
Forecast Valid:
3pm EST Nov 23, 2025-6pm EST Nov 30, 2025
 
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