Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

67°F

19°C

Humidity 61%
Wind Speed SW 5 mph
Barometer 30.07 in (1018.1 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 1 Apr 4:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm.  Steady temperature around 62. North wind around 6 mph.  Chance of precipitation is 80%.

    High: 62 °F

    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm.  Low around 42. East wind 5 to 15 mph.  Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 42 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly before 11am.  Cloudy, with a high near 47. East wind 14 to 16 mph.  Chance of precipitation is 60%.

    High: 47 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 8pm.  Cloudy, with a low around 40. East wind 8 to 13 mph.

    Low: 40 °F

    Slight Chance
    Showers

  • Friday

    Friday: Cloudy, then gradually becoming mostly sunny, with a high near 59. East wind 5 to 8 mph becoming southwest in the afternoon.

    High: 59 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am.  Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am.  High near 60. Chance of precipitation is 80%.

    High: 60 °F

    Showers

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. Steady temperature around 62. North wind around 6 mph. Chance of precipitation is 80%.
Tonight
Showers and possibly a thunderstorm. Low around 42. East wind 5 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers likely, mainly before 11am. Cloudy, with a high near 47. East wind 14 to 16 mph. Chance of precipitation is 60%.
Thursday Night
A 20 percent chance of showers after 8pm. Cloudy, with a low around 40. East wind 8 to 13 mph.
Friday
Cloudy, then gradually becoming mostly sunny, with a high near 59. East wind 5 to 8 mph becoming southwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 47.
Sunday
Showers, mainly after 8am. High near 60. Chance of precipitation is 80%.
Sunday Night
Showers, mainly before 8pm. Low around 41. Chance of precipitation is 80%.
Monday
Mostly sunny, with a high near 53.
Monday Night
Mostly clear, with a low around 39.
Tuesday
Mostly sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 34.
Wednesday
Sunny, with a high near 48.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
2:31 pm EDT Apr 1, 2026
5pm EDT Apr 1, 2026-6pm EDT Apr 8, 2026
 
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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