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

45°F

7°C

Humidity 90%
Wind Speed W 6 mph
Barometer 30.43 in (1030.4 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 1 Nov 11:56 pm EST
Extended Forecast for

Islip NYSimilar City Names

  • Overnight

    Overnight: Patchy fog after 1am. Otherwise, mostly clear, with a low around 42. Light west wind.

    Low: 42 °F

    Patchy Fog

  • Monday

    Monday: Mostly sunny, with a high near 65. Light west wind becoming southwest 8 to 13 mph in the morning.

    High: 65 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 47. Southwest wind 3 to 6 mph.

    Low: 47 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 66. Light southwest wind increasing to 5 to 9 mph in the morning.

    High: 66 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 53. Southwest wind 3 to 5 mph.

    Low: 53 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain. Mostly cloudy, with a high near 69.

    High: 69 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Chance Rain

Detailed Forecast

Overnight
Patchy fog after 1am. Otherwise, mostly clear, with a low around 42. Light west wind.
Monday
Mostly sunny, with a high near 65. Light west wind becoming southwest 8 to 13 mph in the morning.
Monday Night
Partly cloudy, with a low around 47. Southwest wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 66. Light southwest wind increasing to 5 to 9 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 53. Southwest wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 69.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 58.
Friday
Rain likely. Mostly cloudy, with a high near 68. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 52.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 63.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
Mostly sunny, with a high near 60.
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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:
12:06 am EST Nov 2, 2026
Forecast Valid:
12am EST Nov 2, 2026-6pm EST Nov 8, 2026
 
Forecast Discussion
 
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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