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

52°F

11°C

Humidity 83%
Wind Speed SW 10 mph
Barometer 30.23 in (1023.7 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 3 Apr 12:56 pm EDT
Extended Forecast for

Islip NY

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 58. Southwest wind 7 to 10 mph.

    High: 58 °F

    Mostly Cloudy

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 49. Southwest wind 7 to 10 mph, with gusts as high as 22 mph.

    Low: 49 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Partly sunny, with a high near 64. Light and variable wind becoming east 5 to 9 mph in the morning.

    High: 64 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 43. East wind 7 to 10 mph, with gusts as high as 21 mph.

    Low: 43 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 59. South wind 13 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 59 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy, then gradually becoming partly cloudy, with a low around 40.

    Low: 40 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Monday Night

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

    Low: 38 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 58. Southwest wind 7 to 10 mph.
Tonight
Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 49. Southwest wind 7 to 10 mph, with gusts as high as 22 mph.
Saturday
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 64. Light and variable wind becoming east 5 to 9 mph in the morning.
Saturday Night
A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 43. East wind 7 to 10 mph, with gusts as high as 21 mph.
Sunday
Showers. High near 59. South wind 13 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Cloudy, then gradually becoming partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 32.
Wednesday
Sunny, with a high near 47.
Wednesday Night
Mostly clear, with a low around 37.
Thursday
Sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:20 am EDT Apr 3, 2026
Forecast Valid:
1pm EDT Apr 3, 2026-6pm EDT Apr 9, 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