Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

40°F

4°C

Humidity 86%
Wind Speed S 3 mph
Barometer 30.46 in (1031.4 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 9 Apr 11:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Patchy fog after 1am.  Otherwise, partly cloudy, with a low around 38. Light south wind.

    Low: 38 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 9am.  Otherwise, mostly sunny, with a high near 57. Light south wind increasing to 5 to 10 mph in the morning.

    High: 57 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 46. South wind 9 to 14 mph.

    Low: 46 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 60. Northwest wind around 14 mph.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 41. North wind around 6 mph.

    Low: 41 °F

    Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 38. Light south wind.
Friday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 57. Light south wind increasing to 5 to 10 mph in the morning.
Friday Night
Mostly cloudy, with a low around 46. South wind 9 to 14 mph.
Saturday
Sunny, with a high near 60. Northwest wind around 14 mph.
Saturday Night
Clear, with a low around 41. North wind around 6 mph.
Sunday
Mostly sunny, with a high near 56.
Sunday Night
Mostly cloudy, with a low around 46.
Monday
Mostly cloudy, with a high near 66.
Monday Night
Mostly cloudy, with a low around 55.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly cloudy, with a low around 57.
Wednesday
Partly sunny, with a high near 73.
Wednesday Night
Mostly cloudy, with a low around 53.
Thursday
Partly sunny, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
2:47 pm EDT Apr 9, 2026
12am EDT Apr 10, 2026-6pm EDT Apr 16, 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