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

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Light Rain

50°F

10°C

Humidity 93%
Wind Speed NW 14 G 28 mph
Barometer 29.81 in (1009.5 mb)
Dewpoint 48°F (9°C)
Visibility 8.00 mi
Wind Chill45°F (7°C)
Last update 19 Apr 11:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Freeze Watch April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Freeze Watch

  • This Afternoon

    This Afternoon: Showers, mainly before 5pm. Temperature falling to around 46 by 4pm. Breezy, with a northwest wind 18 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    High: 54 °F⇓

    Showers and
    Breezy

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind 3 to 8 mph.

    Low: 39 °F

    Gradual
    Clearing

  • Monday

    Monday: A 30 percent chance of showers. Sunny through mid morning, then becoming mostly cloudy, with a high near 51. West wind 5 to 9 mph.

    High: 51 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31. North wind around 8 mph.

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 51. North wind around 6 mph becoming southwest in the afternoon.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 40.

    Low: 40 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers, mainly before 5pm. Temperature falling to around 46 by 4pm. Breezy, with a northwest wind 18 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind 3 to 8 mph.
Monday
A 30 percent chance of showers. Sunny through mid morning, then becoming mostly cloudy, with a high near 51. West wind 5 to 9 mph.
Monday Night
Partly cloudy, with a low around 31. North wind around 8 mph.
Tuesday
Sunny, with a high near 51. North wind around 6 mph becoming southwest in the afternoon.
Tuesday Night
Increasing clouds, with a low around 40.
Wednesday
Partly sunny, with a high near 58.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 59.
Friday Night
Partly cloudy, with a low around 45.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
10:15 am EDT Apr 19, 2026
Forecast Valid:
12pm EDT Apr 19, 2026-6pm EDT Apr 25, 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