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.

Fair

55°F

13°C

Humidity 90%
Wind Speed E 8 mph
Barometer 30.39 in (1029.1 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 11 Oct 4:56 am EDT
Extended Forecast for

Islip NY

  • Today

    Today: Rain, mainly after 8am. High near 66. East wind 9 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 66 °F

    Rain

  • Tonight

    Tonight: Rain and possibly a thunderstorm, mainly before 2am, then a chance of rain and thunderstorms after 2am. Low around 56. East wind 9 to 15 mph becoming north after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 56 °F

    Rain then
    Rain Likely

  • Columbus Day

    Columbus Day: A chance of rain before 8am, then a chance of showers between 8am and 11am. Cloudy through mid morning, then gradual clearing, with a high near 69. North wind 9 to 13 mph. Chance of precipitation is 40%.

    High: 69 °F

    Chance Rain
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. North wind 3 to 5 mph.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 68. Light and variable wind becoming south 5 to 10 mph in the morning.

    High: 68 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

Detailed Forecast

Today
Rain, mainly after 8am. High near 66. East wind 9 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Rain and possibly a thunderstorm, mainly before 2am, then a chance of rain and thunderstorms after 2am. Low around 56. East wind 9 to 15 mph becoming north after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Columbus Day
A chance of rain before 8am, then a chance of showers between 8am and 11am. Cloudy through mid morning, then gradual clearing, with a high near 69. North wind 9 to 13 mph. Chance of precipitation is 40%.
Monday Night
Mostly clear, with a low around 54. North wind 3 to 5 mph.
Tuesday
Mostly sunny, with a high near 68. Light and variable wind becoming south 5 to 10 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 51.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Partly cloudy, with a low around 49.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 66.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 49.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 60. Breezy.
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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:
2:27 am EDT Oct 11, 2026
Forecast Valid:
5am EDT Oct 11, 2026-6pm EDT Oct 17, 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