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

42°F

6°C

Humidity 82%
Wind Speed E 14 G 25 mph
Barometer 30.41 in (1030.0 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 2 Apr 8:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: A 40 percent chance of showers before 11am. Mostly cloudy, with a high near 45. Northeast wind around 14 mph.

    High: 45 °F

    Chance
    Showers then
    Mostly Cloudy

  • Tonight

    Tonight: A chance of drizzle or light rain, mainly after 2am. Patchy fog. Otherwise, cloudy, with a low around 40. East wind 7 to 11 mph. Chance of precipitation is 30%.

    Low: 40 °F

    Chance Light
    Rain and
    Patchy Fog

  • Friday

    Friday: A chance of drizzle or light rain before 11am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 56. Southeast wind 3 to 8 mph. Chance of precipitation is 30%.

    High: 56 °F

    Chance Light
    Rain and
    Areas Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49. Southwest wind 8 to 10 mph.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers. Partly sunny, with a high near 62. Light and variable wind becoming east 5 to 10 mph in the afternoon.

    High: 62 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 58. Chance of precipitation is 90%.

    High: 58 °F

    Showers

  • Sunday Night

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

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

Detailed Forecast

Today
A 40 percent chance of showers before 11am. Mostly cloudy, with a high near 45. Northeast wind around 14 mph.
Tonight
A chance of drizzle or light rain, mainly after 2am. Patchy fog. Otherwise, cloudy, with a low around 40. East wind 7 to 11 mph. Chance of precipitation is 30%.
Friday
A chance of drizzle or light rain before 11am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 56. Southeast wind 3 to 8 mph. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 49. Southwest wind 8 to 10 mph.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 62. Light and variable wind becoming east 5 to 10 mph in the afternoon.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 43.
Sunday
Showers, mainly after 8am. High near 58. Chance of precipitation is 90%.
Sunday Night
Mostly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 37.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Partly cloudy, with a low around 32.
Wednesday
Sunny, with a high near 46.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:20 am EDT Apr 2, 2026
Forecast Valid:
9am EDT Apr 2, 2026-6pm EDT Apr 8, 2026
 
Forecast Discussion
 
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Additional Resources

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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