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

57°F

14°C

Humidity 90%
Wind Speed E 6 mph
Barometer 30.30 in (1025.9 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 3 Oct 11:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Partly cloudy, with a low around 54. East wind around 6 mph.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers likely, mainly after 5pm. Increasing clouds, with a high near 63. East wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 63 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely, mainly before 11pm. Cloudy, with a low around 55. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 55 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Monday

    Monday: Mostly cloudy through mid morning, then gradual clearing, with a high near 68. Northwest wind 5 to 14 mph.

    High: 68 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 48. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 48 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 47.

    Low: 47 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 54. East wind around 6 mph.
Sunday
Showers likely, mainly after 5pm. Increasing clouds, with a high near 63. East wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Showers likely, mainly before 11pm. Cloudy, with a low around 55. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Monday
Mostly cloudy through mid morning, then gradual clearing, with a high near 68. Northwest wind 5 to 14 mph.
Monday Night
Clear, with a low around 48. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.
Tuesday
Sunny, with a high near 59.
Tuesday Night
Clear, with a low around 47.
Wednesday
Sunny, with a high near 63.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
Sunny, with a high near 68.
Thursday Night
Mostly clear, with a low around 54.
Friday
Sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Mostly sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
2:19 pm EDT Oct 3, 2026
Forecast Valid:
12am EDT Oct 4, 2026-6pm EDT Oct 10, 2026
 
Forecast Discussion
 
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Additional Resources

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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