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

50°F

10°C

Humidity 89%
Wind Speed Calm
Barometer 30.09 in (1019.0 mb)
Dewpoint 47°F (8°C)
Visibility 8.00 mi
Last update 4 Apr 2:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 50. Southwest wind around 6 mph.

    Low: 50 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, partly sunny, with a high near 62. Light and variable wind becoming east 5 to 10 mph in the afternoon.

    High: 62 °F

    Patchy Fog
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of rain after 11pm. Cloudy, with a low around 41. East wind 6 to 10 mph, with gusts as high as 22 mph.

    Low: 41 °F

    Chance Rain

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 2pm. High near 58. Southwest wind 10 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 58 °F

    Rain Likely
    then Rain

  • Sunday Night

    Sunday Night: Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind 6 to 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Rain Likely
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 50. Southwest wind around 6 mph.
Saturday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 62. Light and variable wind becoming east 5 to 10 mph in the afternoon.
Saturday Night
A 40 percent chance of rain after 11pm. Cloudy, with a low around 41. East wind 6 to 10 mph, with gusts as high as 22 mph.
Sunday
Rain likely and possibly a thunderstorm, then rain after 2pm. High near 58. Southwest wind 10 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind 6 to 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 30.
Wednesday
Sunny, with a high near 45.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Sunny, with a high near 53.
Thursday Night
Partly cloudy, with a low around 42.
Friday
Mostly sunny, with a high near 58.
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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:
2:33 am EDT Apr 4, 2026
Forecast Valid:
3am EDT Apr 4, 2026-6pm EDT Apr 10, 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