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

44°F

7°C

Humidity 73%
Wind Speed NW 15 mph
Barometer 29.74 in (1007.1 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 12 Mar 11:56 am EDT
Extended Forecast for

Islip Terrace NY

  • This Afternoon

    This Afternoon: Rain before 5pm, then snow, possibly mixed with rain. Temperature falling to around 37 by 5pm. Northwest wind 16 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 51 °F⇓

    Rain/Snow

  • Tonight

    Tonight: Snow, possibly mixed with rain before 8pm. Low around 30. Northwest wind around 7 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 30 °F

    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 45. Light and variable wind becoming south 9 to 14 mph in the morning.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 36. South wind 10 to 13 mph, with gusts as high as 28 mph.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 50. West wind 10 to 14 mph, with gusts as high as 25 mph.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, with a high near 48.

    High: 48 °F

    Cloudy

  • Sunday Night

    Sunday Night: Rain, mainly after 2am. Low around 40. Chance of precipitation is 80%.

    Low: 40 °F

    Chance Rain
    then Rain

  • Monday

    Monday: Rain. High near 56. Chance of precipitation is 90%.

    High: 56 °F

    Rain

Detailed Forecast

This Afternoon
Rain before 5pm, then snow, possibly mixed with rain. Temperature falling to around 37 by 5pm. Northwest wind 16 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tonight
Snow, possibly mixed with rain before 8pm. Low around 30. Northwest wind around 7 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Friday
Increasing clouds, with a high near 45. Light and variable wind becoming south 9 to 14 mph in the morning.
Friday Night
Partly cloudy, with a low around 36. South wind 10 to 13 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 50. West wind 10 to 14 mph, with gusts as high as 25 mph.
Saturday Night
Increasing clouds, with a low around 32.
Sunday
Cloudy, with a high near 48.
Sunday Night
Rain, mainly after 2am. Low around 40. Chance of precipitation is 80%.
Monday
Rain. High near 56. Chance of precipitation is 90%.
Monday Night
Rain likely, mainly before 2am. Mostly cloudy, with a low around 32. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 42.
Tuesday Night
Partly cloudy, with a low around 25.
Wednesday
Mostly sunny, with a high near 39.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
11:29 am EDT Mar 12, 2026
Forecast Valid:
12pm EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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