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.

A Few Clouds

64°F

18°C

Humidity 81%
Wind Speed W 5 mph
Barometer 29.81 in (1009.4 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 12 Oct 6:56 pm EDT
Extended Forecast for

Islip NYSimilar City Names

  • Tonight

    Tonight: Patchy fog after 8pm. Otherwise, partly cloudy, with a low around 57. Northwest wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 70. Light and variable wind becoming south 5 to 10 mph in the morning.

    High: 70 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Southwest wind around 11 mph, with gusts as high as 22 mph.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 78. West wind around 10 mph.

    High: 78 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 55. North wind 6 to 8 mph.

    Low: 55 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers after 2am. Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers, mainly after 8am. High near 69. Chance of precipitation is 80%.

    High: 69 °F

    Showers

  • Friday Night

    Friday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 45. Breezy. Chance of precipitation is 60%.

    Low: 45 °F

    Breezy.
    Showers
    Likely then
    Chance
    Showers

Detailed Forecast

Tonight
Patchy fog after 8pm. Otherwise, partly cloudy, with a low around 57. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 70. Light and variable wind becoming south 5 to 10 mph in the morning.
Tuesday Night
Mostly clear, with a low around 64. Southwest wind around 11 mph, with gusts as high as 22 mph.
Wednesday
Increasing clouds, with a high near 78. West wind around 10 mph.
Wednesday Night
Mostly cloudy, with a low around 55. North wind 6 to 8 mph.
Thursday
Sunny, with a high near 65.
Thursday Night
A 50 percent chance of showers after 2am. Partly cloudy, with a low around 52.
Friday
Showers, mainly after 8am. High near 69. Chance of precipitation is 80%.
Friday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 45. Breezy. Chance of precipitation is 60%.
Saturday
Mostly sunny, with a high near 55. Breezy.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 44.
Monday
Mostly sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NYSimilar City Names
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:47 pm EDT Oct 12, 2026
Forecast Valid:
7pm EDT Oct 12, 2026-6pm EDT Oct 19, 2026
 
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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