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.

Fair

37°F

3°C

Humidity 52%
Wind Speed W 9 mph
Barometer 30.11 in (1019.7 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 12 Jan 8:56 pm EST
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Mostly clear, with a low around 31. West wind 7 to 9 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 45. West wind 6 to 10 mph.

    High: 45 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 41. Southwest wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm. Cloudy, with a high near 47. Southwest wind 6 to 9 mph.

    High: 47 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers, mainly after 1am. Cloudy, with a low around 32. Calm wind becoming west around 5 mph after midnight.

    Low: 32 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 31. West wind 7 to 9 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 45. West wind 6 to 10 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 41. Southwest wind 8 to 10 mph, with gusts as high as 22 mph.
Wednesday
A 20 percent chance of showers before 1pm. Cloudy, with a high near 47. Southwest wind 6 to 9 mph.
Wednesday Night
A 50 percent chance of showers, mainly after 1am. Cloudy, with a low around 32. Calm wind becoming west around 5 mph after midnight.
Thursday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 42.
Thursday Night
Partly cloudy, with a low around 19.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 26.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Mostly cloudy, with a low around 28.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 37.
Sunday Night
Partly cloudy, with a low around 20.
M.L.King Day
Mostly sunny, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.25°W (Elev. 13 ft)
Last Update:
5:50 pm EST Jan 12, 2026
Forecast Valid:
9pm EST Jan 12, 2026-6pm EST Jan 19, 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