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.

Partly Cloudy

45°F

7°C

Humidity 30%
Wind Speed W 18 G 36 mph
Barometer 29.91 in (1013.0 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 28 Nov 2:56 pm EST
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Mostly clear, with a low around 31. Wind chill values between 25 and 30. West wind 11 to 18 mph, with gusts as high as 40 mph.

    Low: 31 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 43. Wind chill values between 20 and 30. Northwest wind 7 to 10 mph, with gusts as high as 21 mph.

    High: 43 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32. Calm wind becoming south around 6 mph after midnight.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain, mainly after 1pm. High near 52. South wind 9 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 34. Southwest wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 29 mph.

    Low: 34 °F

    Chance Rain

  • Monday

    Monday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 30.

    Low: 30 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Rain, mainly after 1pm. High near 45. Chance of precipitation is 80%.

    High: 45 °F

    Chance Rain
    then Rain

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.

    Low: 31 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 31. Wind chill values between 25 and 30. West wind 11 to 18 mph, with gusts as high as 40 mph.
Saturday
Sunny, with a high near 43. Wind chill values between 20 and 30. Northwest wind 7 to 10 mph, with gusts as high as 21 mph.
Saturday Night
Increasing clouds, with a low around 32. Calm wind becoming south around 6 mph after midnight.
Sunday
Rain, mainly after 1pm. High near 52. South wind 9 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 50 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 34. Southwest wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 29 mph.
Monday
Mostly sunny, with a high near 42.
Monday Night
Increasing clouds, with a low around 30.
Tuesday
Rain, mainly after 1pm. High near 45. Chance of precipitation is 80%.
Tuesday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.
Wednesday
Mostly sunny, with a high near 41.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Mostly sunny, with a high near 40.
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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:
1:32 pm EST Nov 28, 2025
Forecast Valid:
3pm EST Nov 28, 2025-6pm EST Dec 5, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation