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.

Mostly Cloudy

53°F

12°C

Humidity 83%
Wind Speed Calm
Barometer 30.40 in (1029.2 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 10 Oct 7:56 am EDT
Extended Forecast for

Islip NY

  • Today

    Today: Partly sunny, with a high near 66. North wind 5 to 7 mph becoming east in the afternoon.

    High: 66 °F

    Partly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 54. East wind 3 to 6 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain, mainly after 2pm. High near 66. Southeast wind 9 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 66 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: Rain and possibly a thunderstorm. Steady temperature around 62. East wind 9 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 62 °F

    Rain

  • Columbus Day

    Columbus Day: Rain likely, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 69. North wind around 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 69 °F

    Rain Likely

  • Monday Night

    Monday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 30 percent chance of showers before 8am. Partly sunny, with a high near 65.

    High: 65 °F

    Chance
    Showers then
    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 66. North wind 5 to 7 mph becoming east in the afternoon.
Tonight
Increasing clouds, with a low around 54. East wind 3 to 6 mph.
Sunday
Rain, mainly after 2pm. High near 66. Southeast wind 9 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Rain and possibly a thunderstorm. Steady temperature around 62. East wind 9 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Columbus Day
Rain likely, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 69. North wind around 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Mostly sunny, with a high near 70.
Tuesday Night
A chance of thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 48.
Thursday
Sunny, with a high near 62.
Thursday Night
Mostly cloudy, with a low around 50.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:11 am EDT Oct 10, 2026
Forecast Valid:
8am EDT Oct 10, 2026-6pm EDT Oct 16, 2026
 
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