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.

A Few Clouds

64°F

18°C

Humidity 48%
Wind Speed S 15 mph
Barometer 29.99 in (1015.6 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 9 Mar 3:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 40. South wind 5 to 7 mph becoming calm after midnight.

    Low: 40 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 66. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 66 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog. Otherwise, partly cloudy, with a low around 41. South wind around 6 mph becoming calm in the evening.

    Low: 41 °F

    Patchy Fog

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 59. South wind 6 to 14 mph.

    High: 59 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 48. South wind around 14 mph, with gusts as high as 24 mph.

    Low: 48 °F

    Chance
    Showers

  • Thursday

    Thursday: Rain likely, mainly before 2pm. Cloudy, with a temperature falling to around 45 by 5pm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 54 °F⇓

    Rain Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29.

    Low: 29 °F

    Chance Rain
    then Partly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain before 2am. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 40. South wind 5 to 7 mph becoming calm after midnight.
Tuesday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 66. Calm wind becoming south 5 to 8 mph in the afternoon.
Tuesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 41. South wind around 6 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 59. South wind 6 to 14 mph.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 48. South wind around 14 mph, with gusts as high as 24 mph.
Thursday
Rain likely, mainly before 2pm. Cloudy, with a temperature falling to around 45 by 5pm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29.
Friday
Mostly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain before 2am. Mostly cloudy, with a low around 35.
Saturday
Mostly sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 33.
Sunday
Mostly cloudy, with a high near 49.
Sunday Night
Rain likely. Mostly cloudy, with a low around 38. Chance of precipitation is 70%.
Monday
Rain likely. Cloudy, with a high near 49. Chance of precipitation is 60%.
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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:
2:19 pm EDT Mar 9, 2026
Forecast Valid:
4pm EDT Mar 9, 2026-6pm EDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation