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

73°F

23°C

Humidity 84%
Wind Speed SW 7 mph
Barometer 30.03 in (1016.8 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 26 Jun 8:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 66. Southwest wind around 6 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers, mainly after noon. Mostly cloudy, with a high near 80. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 80 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers before 10pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 64. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 64 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 84. Calm wind becoming northeast 5 to 7 mph in the morning.

    High: 84 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. South wind around 6 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 66. Southwest wind around 6 mph becoming calm in the evening.
Saturday
A 40 percent chance of showers, mainly after noon. Mostly cloudy, with a high near 80. Calm wind becoming south 5 to 7 mph in the afternoon.
Saturday Night
A slight chance of showers before 10pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 64. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Sunday
Partly sunny, with a high near 84. Calm wind becoming northeast 5 to 7 mph in the morning.
Sunday Night
Partly cloudy, with a low around 65. South wind around 6 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 84.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 86.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 74.
Thursday
Mostly sunny, with a high near 90.
Thursday Night
Mostly clear, with a low around 76.
Friday
Sunny, with a high near 92.
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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:
8:13 pm EDT Jun 26, 2026
Forecast Valid:
9pm EDT Jun 26, 2026-6pm EDT Jul 3, 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