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/Mist

52°F

11°C

Humidity 93%
Wind Speed SW 15 G 26 mph
Barometer 29.85 in (1010.7 mb)
Dewpoint 50°F (10°C)
Visibility 2.00 mi
Wind Chill47°F (8°C)
Last update 5 Apr 9:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Rain and possibly a thunderstorm. High near 57. Southwest wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 57 °F

    Rain

  • Tonight

    Tonight: Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 38. Southwest wind around 7 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 38 °F

    Rain Likely
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 53. West wind around 10 mph, with gusts as high as 20 mph.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain. Partly cloudy, with a low around 39. Light west wind.

    Low: 39 °F

    Slight Chance
    Rain

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. West wind 7 to 13 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 45.

    High: 45 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

Detailed Forecast

Today
Rain and possibly a thunderstorm. High near 57. Southwest wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 38. Southwest wind around 7 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Sunny, with a high near 53. West wind around 10 mph, with gusts as high as 20 mph.
Monday Night
A 20 percent chance of rain. Partly cloudy, with a low around 39. Light west wind.
Tuesday
Mostly sunny, with a high near 51. West wind 7 to 13 mph.
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
Mostly sunny, with a high near 52.
Thursday Night
Partly cloudy, with a low around 43.
Friday
Mostly sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 45.
Saturday
Partly sunny, with a high near 59.
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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:
5:03 am EDT Apr 5, 2026
Forecast Valid:
10am EDT Apr 5, 2026-6pm EDT Apr 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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