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.

Overcast

58°F

14°C

Humidity 93%
Wind Speed SW 15 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 56°F (13°C)
Visibility 9.00 mi
Last update 26 Nov 1:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Showers, mainly before 4am. Patchy fog. Low around 52. Southwest wind 10 to 14 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 52 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: Showers likely, mainly before 10am. Patchy fog before 1pm, then patchy fog after 4pm. Otherwise, cloudy, with a high near 62. Southwest wind 9 to 13 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    High: 62 °F

    Showers
    Likely and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 10pm. Patchy fog before 10pm. Otherwise, cloudy during the early evening, then gradual clearing, with a low around 38. Breezy, with a west wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 33 mph.

    Low: 38 °F

    Chance
    Showers and
    Patchy Fog
    then Partly
    Cloudy and
    Breezy

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 47. Breezy, with a west wind 18 to 24 mph, with gusts as high as 38 mph.

    High: 47 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31. Breezy, with a west wind 20 to 22 mph, with gusts as high as 36 mph.

    Low: 31 °F

    Mostly Clear
    and Breezy

  • Friday

    Friday: Mostly sunny, with a high near 44. Windy.

    High: 44 °F

    Mostly Sunny
    and Windy

  • Friday Night

    Friday Night: Mostly clear, with a low around 31. Breezy.

    Low: 31 °F

    Partly Cloudy
    and Breezy
    then Mostly
    Clear

  • Saturday

    Saturday: Sunny, with a high near 44.

    High: 44 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Showers, mainly before 4am. Patchy fog. Low around 52. Southwest wind 10 to 14 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers likely, mainly before 10am. Patchy fog before 1pm, then patchy fog after 4pm. Otherwise, cloudy, with a high near 62. Southwest wind 9 to 13 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
A 30 percent chance of showers before 10pm. Patchy fog before 10pm. Otherwise, cloudy during the early evening, then gradual clearing, with a low around 38. Breezy, with a west wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 33 mph.
Thanksgiving Day
Mostly sunny, with a high near 47. Breezy, with a west wind 18 to 24 mph, with gusts as high as 38 mph.
Thursday Night
Mostly clear, with a low around 31. Breezy, with a west wind 20 to 22 mph, with gusts as high as 36 mph.
Friday
Mostly sunny, with a high near 44. Windy.
Friday Night
Mostly clear, with a low around 31. Breezy.
Saturday
Sunny, with a high near 44.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Mostly cloudy, with a high near 54.
Sunday Night
A 50 percent chance of rain. Cloudy, with a low around 41.
Monday
A 40 percent chance of rain. Cloudy, with a high near 52.
Monday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 34.
Tuesday
Rain likely. Mostly cloudy, with a high near 46. Chance of precipitation is 60%.
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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:
1:00 am EST Nov 26, 2025
Forecast Valid:
2am EST Nov 26, 2025-6pm EST Dec 2, 2025
 
Forecast Discussion
 
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Additional Resources

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