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

59°F

15°C

Humidity 93%
Wind Speed Calm
Barometer 30.24 in (1023.8 mb)
Dewpoint 57°F (14°C)
Visibility 0.25 mi
Last update 5 Oct 4:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Patchy dense fog before 10am. Otherwise, sunny, with a high near 82. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 82 °F

    Patchy Dense
    Fog then
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. South wind around 6 mph.

    Low: 60 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 78. South wind 6 to 11 mph.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60. Southwest wind 8 to 10 mph.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78. Southwest wind 8 to 15 mph.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Showers, mainly after 2am. Low around 61. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 61 °F

    Chance
    Showers then
    Showers

  • Wednesday

    Wednesday: Showers, mainly before 2pm. High near 73. Chance of precipitation is 80%.

    High: 73 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 50.

    Low: 50 °F

    Chance
    Showers then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

Detailed Forecast

Today
Patchy dense fog before 10am. Otherwise, sunny, with a high near 82. Calm wind becoming south 5 to 7 mph in the afternoon.
Tonight
Mostly clear, with a low around 60. South wind around 6 mph.
Monday
Sunny, with a high near 78. South wind 6 to 11 mph.
Monday Night
Mostly clear, with a low around 60. Southwest wind 8 to 10 mph.
Tuesday
Mostly sunny, with a high near 78. Southwest wind 8 to 15 mph.
Tuesday Night
Showers, mainly after 2am. Low around 61. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers, mainly before 2pm. High near 73. Chance of precipitation is 80%.
Wednesday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 50.
Thursday
Sunny, with a high near 65.
Thursday Night
Mostly clear, with a low around 49.
Friday
Mostly sunny, with a high near 67.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
5:01 am EDT Oct 5, 2025
Forecast Valid:
5am EDT Oct 5, 2025-6pm EDT Oct 11, 2025
 
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