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.

Fog

35°F

2°C

Humidity 96%
Wind Speed Calm
Barometer 30.35 in (1027.6 mb)
Dewpoint 34°F (1°C)
Visibility 0.50 mi
Last update 7 Mar 2:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Areas of fog. Otherwise, cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Areas Fog

  • Saturday

    Saturday: Areas of drizzle and fog between 7am and 1pm. Cloudy, with a high near 45. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 45 °F

    Areas Drizzle
    and Areas Fog

  • Saturday Night

    Saturday Night: A 50 percent chance of showers after 10pm. Areas of fog before 4am. Otherwise, cloudy, with a temperature rising to around 47 by 5am. Southwest wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 41 °F⇑

    Chance
    Showers and
    Areas Fog

  • Sunday

    Sunday: A 40 percent chance of rain. Cloudy, with a high near 58. Southwest wind 8 to 10 mph.

    High: 58 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. West wind around 5 mph becoming calm in the evening.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Monday Night

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

    Low: 40 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Areas of fog. Otherwise, cloudy, with a low around 34. Calm wind.
Saturday
Areas of drizzle and fog between 7am and 1pm. Cloudy, with a high near 45. Calm wind becoming south 5 to 8 mph in the afternoon.
Saturday Night
A 50 percent chance of showers after 10pm. Areas of fog before 4am. Otherwise, cloudy, with a temperature rising to around 47 by 5am. Southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday
A 40 percent chance of rain. Cloudy, with a high near 58. Southwest wind 8 to 10 mph.
Sunday Night
Mostly clear, with a low around 37. West wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Partly sunny, with a high near 57.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
A 40 percent chance of rain before 1pm. Cloudy, with a high near 54.
Wednesday Night
Rain likely. Cloudy, with a low around 41. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Cloudy, with a high near 51.
Thursday Night
Partly cloudy, with a low around 28.
Friday
Partly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:47 am EST Mar 7, 2026
Forecast Valid:
3am EST Mar 7, 2026-6pm EDT Mar 13, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation