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.

Mostly Cloudy

77°F

25°C

Humidity 74%
Wind Speed SW 7 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 26 Jun 4:56 pm EDT
Extended Forecast for

5 Miles SSE West Sayville NY

  • Tonight

    Tonight: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 65. South wind 8 to 13 mph becoming light west after midnight.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers, mainly after 10am. Mostly cloudy, with a high near 72. Light and variable wind becoming south 5 to 7 mph in the morning.

    High: 72 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers before 10pm, then a chance of showers after midnight. Mostly cloudy, with a low around 65. South wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 75. Northeast wind 5 to 7 mph becoming southeast in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 66. South wind around 6 mph becoming light and variable after midnight.

    Low: 66 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 65. South wind 8 to 13 mph becoming light west after midnight.
Saturday
A 50 percent chance of showers, mainly after 10am. Mostly cloudy, with a high near 72. Light and variable wind becoming south 5 to 7 mph in the morning.
Saturday Night
A slight chance of showers before 10pm, then a chance of showers after midnight. Mostly cloudy, with a low around 65. South wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 75. Northeast wind 5 to 7 mph becoming southeast in the afternoon.
Sunday Night
Partly cloudy, with a low around 66. South wind around 6 mph becoming light and variable after midnight.
Monday
Mostly sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 71.
Wednesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 79.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 73.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 75.
Friday
Sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE West Sayville NY
 40.67°N 73.06°W (Elev. 0 ft)
Last Update:
2:46 pm EDT Jun 26, 2026
Forecast Valid:
5pm 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