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.

Light Rain

51°F

11°C

Humidity 89%
Wind Speed SW 8 mph
Barometer 29.65 in (1004.0 mb)
Dewpoint 48°F (9°C)
Visibility 7.00 mi
Wind Chill48°F (9°C)
Last update 27 Mar 2:56 am EDT
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Showers. Steady temperature around 51. West wind around 14 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Showers

  • Friday

    Friday: Showers likely, mainly before 8am. Mostly cloudy, with a high near 53. North wind 10 to 14 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 53 °F

    Showers
    Likely then
    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 31. Northeast wind 6 to 8 mph.

    Low: 31 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 10 to 13 mph.

    High: 41 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Northwest wind around 6 mph becoming calm after midnight.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 54.

    High: 54 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Showers. Steady temperature around 51. West wind around 14 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 53. North wind 10 to 14 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Mostly cloudy, with a low around 31. Northeast wind 6 to 8 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 10 to 13 mph.
Saturday Night
Partly cloudy, with a low around 29. Northwest wind around 6 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 47.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Partly sunny, with a high near 54.
Monday Night
Mostly cloudy, with a low around 43.
Tuesday
A 30 percent chance of rain. Partly sunny, with a high near 55.
Tuesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 44.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 59.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 59.
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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 Mar 27, 2026
Forecast Valid:
3am EDT Mar 27, 2026-6pm EDT Apr 2, 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