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.

A Few Clouds and Breezy

15°C

59°F

Humidity 36%
Wind Speed W 33 G 50 km/h
Barometer 1003.1 mb (29.62 in)
Dewpoint 0°C (32°F)
Visibility 16 km
Last update 22 Mar 5:56 pm EDT
Extended Forecast for

Stony Brook NY

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 10pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 0. Breezy, with a northwest wind 18 to 23 km/h increasing to 27 to 32 km/h in the evening.

    Low: 0 °C

    Chance
    Showers then
    Mostly Clear
    and Breezy

  • Sunday

    Sunday: Sunny, with a high near 8. Wind chill values between -5 and 5. Northwest wind 16 to 24 km/h.

    High: 8 °C

    Sunny

  • Sunday Night

    Sunday Night: Rain likely after 2am. Increasing clouds, with a low around 3. South wind 5 to 11 km/h. Chance of precipitation is 60%. New precipitation amounts between 1 and 2.5 mm possible.

    Low: 3 °C

    Mostly Cloudy
    then Rain
    Likely

  • Monday

    Monday: Rain. High near 9. Southeast wind 16 to 24 km/h. Chance of precipitation is 100%. New precipitation amounts between 7.5 mm and 1 cm possible.

    High: 9 °C

    Rain

  • Monday Night

    Monday Night: A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 4. West wind around 13 km/h.

    Low: 4 °C

    Chance Rain
    then Partly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 11.

    High: 11 °C

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 2.

    Low: 2 °C

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of showers between 8am and 2pm. Partly sunny, with a high near 9. Chance of precipitation is 40%.

    High: 9 °C

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 0.

    Low: 0 °C

    Partly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of showers, mainly before 10pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 0. Breezy, with a northwest wind 18 to 23 km/h increasing to 27 to 32 km/h in the evening.
Sunday
Sunny, with a high near 8. Wind chill values between -5 and 5. Northwest wind 16 to 24 km/h.
Sunday Night
Rain likely after 2am. Increasing clouds, with a low around 3. South wind 5 to 11 km/h. Chance of precipitation is 60%. New precipitation amounts between 1 and 2.5 mm possible.
Monday
Rain. High near 9. Southeast wind 16 to 24 km/h. Chance of precipitation is 100%. New precipitation amounts between 7.5 mm and 1 cm possible.
Monday Night
A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 4. West wind around 13 km/h.
Tuesday
Mostly sunny, with a high near 11.
Tuesday Night
Mostly cloudy, with a low around 2.
Wednesday
A chance of showers between 8am and 2pm. Partly sunny, with a high near 9. Chance of precipitation is 40%.
Wednesday Night
Partly cloudy, with a low around 0.
Thursday
Sunny, with a high near 11.
Thursday Night
Partly cloudy, with a low around 4.
Friday
Mostly sunny, with a high near 13.
Friday Night
Mostly cloudy, with a low around 5.
Saturday
Mostly cloudy, with a high near 14.
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:
5:15 pm EDT Mar 22, 2025
Forecast Valid:
6pm EDT Mar 22, 2025-6pm EDT Mar 29, 2025
 
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