Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

50°F

10°C

Humidity 83%
Wind Speed SW 12 mph
Barometer 30.03 in (1017.0 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 31 Mar 3:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Showers likely.  Mostly cloudy, with a low around 51. Southwest wind around 10 mph.  Chance of precipitation is 60%.

    Low: 51 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before 11am.  Partly sunny, with a high near 67. Southwest wind 13 to 15 mph.  Chance of precipitation is 60%.

    High: 67 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly after 5am.  Mostly cloudy, with a low around 54. South wind around 15 mph.

    Low: 54 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before 8am, then a chance of rain between 8am and 2pm, then rain likely and possibly a thunderstorm after 2pm.  Mostly cloudy, with a high near 68. Southwest wind 9 to 13 mph.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 68 °F

    Chance Rain
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm.  Low around 42. Northeast wind 8 to 13 mph.  Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 42 °F

    Rain

  • Thursday

    Thursday: A 30 percent chance of rain before 2pm.  Cloudy, with a high near 47.

    High: 47 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A chance of rain between 8pm and 2am.  Cloudy, with a low around 41. Chance of precipitation is 30%.

    Low: 41 °F

    Chance Rain

  • Friday

    Friday: Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy

  • Friday Night

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

    Low: 51 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Showers likely. Mostly cloudy, with a low around 51. Southwest wind around 10 mph. Chance of precipitation is 60%.
Tuesday
Showers likely, mainly before 11am. Partly sunny, with a high near 67. Southwest wind 13 to 15 mph. Chance of precipitation is 60%.
Tuesday Night
A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 54. South wind around 15 mph.
Wednesday
A chance of showers before 8am, then a chance of rain between 8am and 2pm, then rain likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 68. Southwest wind 9 to 13 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Rain and possibly a thunderstorm. Low around 42. Northeast wind 8 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A 30 percent chance of rain before 2pm. Cloudy, with a high near 47.
Thursday Night
A chance of rain between 8pm and 2am. Cloudy, with a low around 41. Chance of precipitation is 30%.
Friday
Mostly cloudy, with a high near 60.
Friday Night
Mostly cloudy, with a low around 51.
Saturday
Partly sunny, with a high near 65.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 48.
Sunday
A 40 percent chance of rain. Mostly cloudy, with a high near 63.
Sunday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 44.
Monday
A 30 percent chance of rain. Partly sunny, with a high near 52.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
2:46 am EDT Mar 31, 2026
4am EDT Mar 31, 2026-6pm EDT Apr 6, 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