National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

35°F

2°C

Humidity 38%
Wind Speed NW 8 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 17 Mar 9:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Wind chill values between 15 and 20. Northwest wind 11 to 13 mph.

    Low: 25 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37. Wind chill values between 20 and 30. Northwest wind around 5 mph becoming light and variable in the afternoon.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 27. Calm wind.

    Low: 27 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 43. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 33. Calm wind.

    Low: 33 °F

    Partly Cloudy
    then Slight
    Chance Snow
    Showers

  • Friday

    Friday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of rain. Partly sunny, with a high near 49.

    High: 49 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 25. Wind chill values between 15 and 20. Northwest wind 11 to 13 mph.
Wednesday
Mostly sunny, with a high near 37. Wind chill values between 20 and 30. Northwest wind around 5 mph becoming light and variable in the afternoon.
Wednesday Night
Mostly clear, with a low around 27. Calm wind.
Thursday
Mostly sunny, with a high near 43. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 33. Calm wind.
Friday
Partly sunny, with a high near 49.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 49.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 37.
Sunday
Mostly cloudy, with a high near 52.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 36.
Monday
Sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 28.
Tuesday
Sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
7:30 pm EDT Mar 17, 2026
Forecast Valid:
10pm EDT Mar 17, 2026-6pm EDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation