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.

Partly Cloudy

48°F

9°C

Humidity 68%
Wind Speed W 18 G 31 mph
Barometer 29.72 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 7 Jan 1:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 49. West wind around 16 mph, with gusts as high as 32 mph.

    High: 49 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 32. Northwest wind 5 to 9 mph.

    Low: 32 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 47. Northwest wind 3 to 6 mph.

    High: 47 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 33. Calm wind.

    Low: 33 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 51. Light south wind increasing to 9 to 14 mph in the morning.

    High: 51 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: Rain likely, mainly before 1am. Cloudy, with a steady temperature around 48. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 48 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 52. Chance of precipitation is 90%.

    High: 52 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 41. Chance of precipitation is 90%.

    Low: 41 °F

    Rain

  • Sunday

    Sunday: A 40 percent chance of rain before 1pm. Mostly cloudy, with a high near 50.

    High: 50 °F

    Chance Rain

Detailed Forecast

This Afternoon
Sunny, with a high near 49. West wind around 16 mph, with gusts as high as 32 mph.
Tonight
Partly cloudy, with a low around 32. Northwest wind 5 to 9 mph.
Thursday
Sunny, with a high near 47. Northwest wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 33. Calm wind.
Friday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 51. Light south wind increasing to 9 to 14 mph in the morning.
Friday Night
Rain likely, mainly before 1am. Cloudy, with a steady temperature around 48. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 52. Chance of precipitation is 90%.
Saturday Night
Rain. Low around 41. Chance of precipitation is 90%.
Sunday
A 40 percent chance of rain before 1pm. Mostly cloudy, with a high near 50.
Sunday Night
Partly cloudy, with a low around 28.
Monday
Sunny, with a high near 39.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 44.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
12:54 pm EST Jan 7, 2026
Forecast Valid:
2pm EST Jan 7, 2026-6pm EST Jan 13, 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