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.

Fair

50°F

10°C

Humidity 93%
Wind Speed SW 6 mph
Barometer 30.08 in (1018.6 mb)
Dewpoint 48°F (9°C)
Visibility 8.00 mi
Wind Chill48°F (9°C)
Last update 4 Apr 3:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Today

    Today: Patchy fog before 10am. Otherwise, partly sunny, with a high near 59. West wind 5 to 10 mph becoming east in the afternoon.

    High: 59 °F

    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: A 50 percent chance of rain after 11pm. Cloudy, with a low around 42. East wind 9 to 14 mph.

    Low: 42 °F

    Chance Rain

  • Sunday

    Sunday: Rain and possibly a thunderstorm. High near 59. Southwest wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 59 °F

    Rain

  • Sunday Night

    Sunday Night: Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 40. Northwest wind around 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Rain Likely
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 54. West wind around 11 mph.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers before 2pm. Mostly sunny, with a high near 51.

    High: 51 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 47.

    High: 47 °F

    Sunny

Detailed Forecast

Today
Patchy fog before 10am. Otherwise, partly sunny, with a high near 59. West wind 5 to 10 mph becoming east in the afternoon.
Tonight
A 50 percent chance of rain after 11pm. Cloudy, with a low around 42. East wind 9 to 14 mph.
Sunday
Rain and possibly a thunderstorm. High near 59. Southwest wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 40. Northwest wind around 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Sunny, with a high near 54. West wind around 11 mph.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
A 30 percent chance of showers before 2pm. Mostly sunny, with a high near 51.
Tuesday Night
Mostly clear, with a low around 31.
Wednesday
Sunny, with a high near 47.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Sunny, with a high near 56.
Thursday Night
Partly cloudy, with a low around 43.
Friday
Mostly sunny, with a high near 60.
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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:
2:33 am EDT Apr 4, 2026
Forecast Valid:
4am EDT Apr 4, 2026-6pm EDT Apr 10, 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