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

22°C

72°F

Humidity 64%
Wind Speed N 6 km/h
Barometer 1018.9 mb (30.09 in)
Dewpoint 15°C (59°F)
Visibility 16 km
Last update 26 Jul 10:56 pm EDT
Extended Forecast for

Stony Brook NY

  • Overnight

    Overnight: Mostly clear, with a low around 19. North wind around 8 km/h.

    Low: 19 °C

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 30. North wind 8 to 11 km/h becoming southeast in the afternoon.

    High: 30 °C

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 19. South wind 5 to 10 km/h becoming calm after midnight.

    Low: 19 °C

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 30. North wind 5 to 10 km/h becoming southeast in the afternoon.

    High: 30 °C

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 21. Southeast wind around 11 km/h.

    Low: 21 °C

    Slight Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 29.

    High: 29 °C

    Partly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 22.

    Low: 22 °C

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 29. Chance of precipitation is 30%.

    High: 29 °C

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 22.

    Low: 22 °C

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 19. North wind around 8 km/h.
Saturday
Sunny, with a high near 30. North wind 8 to 11 km/h becoming southeast in the afternoon.
Saturday Night
Mostly clear, with a low around 19. South wind 5 to 10 km/h becoming calm after midnight.
Sunday
Mostly sunny, with a high near 30. North wind 5 to 10 km/h becoming southeast in the afternoon.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 21. Southeast wind around 11 km/h.
Monday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 29.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 22.
Tuesday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 29. Chance of precipitation is 30%.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 22.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 30.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 22.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 31.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 23.
Friday
Mostly sunny, with a high near 32.
Click Map For Forecast
Disclaimer
Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 m)
Last Update:
10:55 pm EDT Jul 26, 2024
Forecast Valid:
12am EDT Jul 27, 2024-6pm EDT Aug 2, 2024
 
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