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

44°F

7°C

Humidity 49%
Wind Speed N 7 mph
Barometer 30.41 in (1029.8 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 12 Apr 2:56 am EDT
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Clear, with a steady temperature around 44. North wind around 7 mph.

    Low: 44 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 54. Northeast wind 6 to 8 mph becoming south in the afternoon.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 44. South wind 6 to 8 mph.

    Low: 44 °F

    Increasing
    Clouds

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 69. Southwest wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 69 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 52. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 52 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.

    Low: 57 °F

    Chance
    Showers then
    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a steady temperature around 44. North wind around 7 mph.
Sunday
Sunny, with a high near 54. Northeast wind 6 to 8 mph becoming south in the afternoon.
Sunday Night
Increasing clouds, with a low around 44. South wind 6 to 8 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 69. Southwest wind 11 to 14 mph, with gusts as high as 24 mph.
Monday Night
Mostly cloudy, with a low around 52. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
A chance of showers between 8pm and midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 75.
Thursday Night
Mostly cloudy, with a low around 56.
Friday
Mostly sunny, with a high near 70.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Partly sunny, with a high near 65.
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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:
2:46 am EDT Apr 12, 2026
Forecast Valid:
3am EDT Apr 12, 2026-6pm EDT Apr 18, 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