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

43°F

6°C

Humidity 82%
Wind Speed E 15 G 28 mph
Barometer 30.34 in (1027.4 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 2 Apr 6:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Today

    Today: Showers likely, mainly before 8am. Cloudy, with a high near 44. East wind around 15 mph. Chance of precipitation is 70%.

    High: 44 °F

    Showers
    Likely then
    Mostly Cloudy

  • Tonight

    Tonight: A chance of drizzle or light rain, mainly after 2am. Patchy fog. Otherwise, cloudy, with a low around 40. East wind 8 to 13 mph. Chance of precipitation is 30%.

    Low: 40 °F

    Chance Light
    Rain and
    Patchy Fog

  • Friday

    Friday: A chance of drizzle or light rain before 11am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 58. Light and variable wind becoming south around 6 mph in the afternoon. Chance of precipitation is 30%.

    High: 58 °F

    Chance Light
    Rain and
    Areas Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 51. Southwest wind 8 to 11 mph.

    Low: 51 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers. Partly sunny, with a high near 63. Light and variable wind becoming east 5 to 10 mph in the afternoon.

    High: 63 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 60. Chance of precipitation is 100%.

    High: 60 °F

    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
Showers likely, mainly before 8am. Cloudy, with a high near 44. East wind around 15 mph. Chance of precipitation is 70%.
Tonight
A chance of drizzle or light rain, mainly after 2am. Patchy fog. Otherwise, cloudy, with a low around 40. East wind 8 to 13 mph. Chance of precipitation is 30%.
Friday
A chance of drizzle or light rain before 11am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 58. Light and variable wind becoming south around 6 mph in the afternoon. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 51. Southwest wind 8 to 11 mph.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 63. Light and variable wind becoming east 5 to 10 mph in the afternoon.
Saturday Night
A 30 percent chance of showers after 2am. Cloudy, with a low around 44.
Sunday
Showers, mainly after 8am. High near 60. Chance of precipitation is 100%.
Sunday Night
Mostly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Mostly sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 32.
Wednesday
Sunny, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
2:20 am EDT Apr 2, 2026
Forecast Valid:
7am EDT Apr 2, 2026-6pm EDT Apr 8, 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