National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fog/Mist

73°F

23°C

Humidity 100%
Wind Speed Calm
Barometer 29.97 in (1014.9 mb)
Dewpoint 73°F (23°C)
Visibility 1.00 mi
Last update 28 Aug 6:56 am EDT
Extended Forecast for

Islip NYSimilar City Names

  • Today

    Today: A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 40%.

    High: 82 °F

    Slight Chance
    Showers and
    Areas Fog
    then Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 63. North wind 3 to 8 mph.

    Low: 63 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 79. North wind 5 to 8 mph.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. Light south wind.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. Light west wind becoming southwest 6 to 11 mph in the morning.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers after 8am. Mostly cloudy, with a high near 81.

    High: 81 °F

    Chance
    Showers

Detailed Forecast

Today
A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 40%.
Tonight
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 63. North wind 3 to 8 mph.
Saturday
Mostly sunny, with a high near 79. North wind 5 to 8 mph.
Saturday Night
Mostly clear, with a low around 63. Light south wind.
Sunday
Sunny, with a high near 81. Light west wind becoming southwest 6 to 11 mph in the morning.
Sunday Night
Partly cloudy, with a low around 68.
Monday
Partly sunny, with a high near 83.
Monday Night
Mostly cloudy, with a low around 68.
Tuesday
A 40 percent chance of showers after 8am. Mostly cloudy, with a high near 81.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Wednesday
A 50 percent chance of showers. Partly sunny, with a high near 81.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Thursday
Partly sunny, with a high near 82.
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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:
4:20 am EDT Aug 28, 2026
Forecast Valid:
7am EDT Aug 28, 2026-6pm EDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation