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.

Overcast

44°F

7°C

Humidity 51%
Wind Speed NW 12 mph
Barometer 29.72 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 11 Jan 12:56 pm EST
Extended Forecast for

Islip Terrace NY

  • This Afternoon

    This Afternoon: A 30 percent chance of showers after 4pm. Mostly sunny, with a high near 46. West wind around 11 mph.

    High: 46 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers before 7pm. Mostly clear, with a low around 28. Wind chill values between 20 and 25. West wind 11 to 15 mph, with gusts as high as 34 mph.

    Low: 28 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 41. Wind chill values between 20 and 30. West wind around 11 mph, with gusts as high as 26 mph.

    High: 41 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30. West wind around 7 mph, with gusts as high as 20 mph.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 45. Southwest wind 5 to 9 mph.

    High: 45 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 47.

    High: 47 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain after 1am. Cloudy, with a low around 34.

    Low: 34 °F

    Cloudy then
    Chance Rain

  • Thursday

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

    High: 43 °F

    Chance Rain

Detailed Forecast

This Afternoon
A 30 percent chance of showers after 4pm. Mostly sunny, with a high near 46. West wind around 11 mph.
Tonight
A 30 percent chance of showers before 7pm. Mostly clear, with a low around 28. Wind chill values between 20 and 25. West wind 11 to 15 mph, with gusts as high as 34 mph.
Monday
Mostly sunny, with a high near 41. Wind chill values between 20 and 30. West wind around 11 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 30. West wind around 7 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 45. Southwest wind 5 to 9 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 40.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
A 40 percent chance of rain after 1am. Cloudy, with a low around 34.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 43.
Thursday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 39.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
1:42 pm EST Jan 11, 2026
Forecast Valid:
1pm EST Jan 11, 2026-6pm EST Jan 17, 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