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

36°F

2°C

Humidity 93%
Wind Speed Calm
Barometer 30.21 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 5 Mar 4:51 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Rain. Patchy fog. High near 39. Light east wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 39 °F

    Rain and
    Patchy Fog

  • Tonight

    Tonight: Rain, mainly before 4am. Patchy fog. Low around 34. East wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 34 °F

    Rain and
    Patchy Fog

  • Friday

    Friday: A 30 percent chance of rain, mainly before 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 41. Northeast wind 10 to 13 mph, with gusts as high as 25 mph.

    High: 41 °F

    Chance Rain
    and Patchy
    Fog

  • Friday Night

    Friday Night: A 20 percent chance of rain after 1am. Cloudy, with a low around 34. Northeast wind 5 to 8 mph becoming calm in the evening.

    Low: 34 °F

    Cloudy then
    Slight Chance
    Rain

  • Saturday

    Saturday: Cloudy, with a high near 49. Calm wind becoming south 5 to 9 mph in the morning.

    High: 49 °F

    Cloudy

  • Saturday Night

    Saturday Night: Showers likely. Cloudy, with a low around 43. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 43 °F

    Showers
    Likely

  • Sunday

    Sunday: A 30 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 56.

    High: 56 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
Rain. Patchy fog. High near 39. Light east wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Rain, mainly before 4am. Patchy fog. Low around 34. East wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
A 30 percent chance of rain, mainly before 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 41. Northeast wind 10 to 13 mph, with gusts as high as 25 mph.
Friday Night
A 20 percent chance of rain after 1am. Cloudy, with a low around 34. Northeast wind 5 to 8 mph becoming calm in the evening.
Saturday
Cloudy, with a high near 49. Calm wind becoming south 5 to 9 mph in the morning.
Saturday Night
Showers likely. Cloudy, with a low around 43. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
A 30 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Partly sunny, with a high near 57.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
A 30 percent chance of rain. Cloudy, with a high near 55.
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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:
12:54 am EST Mar 5, 2026
Forecast Valid:
5am EST Mar 5, 2026-6pm EDT Mar 11, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation