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

N/A

Humidity NA
Wind Speed E 3 mph
Barometer 30.31 in
Dewpoint N/A
Visibility 7.00 mi
Last update 9 Jan 2:56 am EST
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Partly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of rain after 3pm. Increasing clouds, with a high near 52. South wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 52 °F

    Mostly Sunny
    then Chance
    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain, mainly before 10pm. Cloudy, with a low around 41. South wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 23 mph.

    Low: 41 °F

    Chance Rain
    then Cloudy

  • Saturday

    Saturday: Rain likely, mainly after 3pm. Cloudy, with a steady temperature around 43. Light and variable wind becoming east 5 to 7 mph in the morning. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 43 °F

    Slight Chance
    Rain then
    Rain Likely

  • Saturday Night

    Saturday Night: Rain. Steady temperature around 41. East wind around 6 mph becoming northwest after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 41 °F

    Rain then
    Rain Likely

  • Sunday

    Sunday: A chance of rain before noon, then a chance of showers after noon. Cloudy, then gradually becoming mostly sunny, with a high near 46. Chance of precipitation is 40%.

    High: 46 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 28. Calm wind.
Friday
A 40 percent chance of rain after 3pm. Increasing clouds, with a high near 52. South wind 6 to 10 mph, with gusts as high as 20 mph.
Friday Night
A 50 percent chance of rain, mainly before 10pm. Cloudy, with a low around 41. South wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 23 mph.
Saturday
Rain likely, mainly after 3pm. Cloudy, with a steady temperature around 43. Light and variable wind becoming east 5 to 7 mph in the morning. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
Rain. Steady temperature around 41. East wind around 6 mph becoming northwest after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
A chance of rain before noon, then a chance of showers after noon. Cloudy, then gradually becoming mostly sunny, with a high near 46. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 28.
Monday
Sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Mostly sunny, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 32.
Thursday
A 30 percent chance of showers. Mostly cloudy, with a high near 40.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
3:06 am EST Jan 9, 2026
Forecast Valid:
3am EST Jan 9, 2026-6pm EST Jan 15, 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