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.

Light Drizzle Fog/Mist

39°F

4°C

Humidity 93%
Wind Speed N 14 mph
Barometer 29.82 in (1009.8 mb)
Dewpoint 37°F (3°C)
Visibility 6.00 mi
Wind Chill31°F (-1°C)
Last update 23 Mar 11:56 am EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: A chance of rain before 2pm, then a slight chance of showers after 2pm. Cloudy, with a high near 43. North wind around 10 mph. Chance of precipitation is 50%.

    High: 43 °F

    Chance Rain

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Wind chill values between 25 and 30. Northwest wind 10 to 14 mph.

    Low: 32 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 46. Wind chill values between 25 and 35 early. North wind 6 to 10 mph becoming west in the afternoon.

    High: 46 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 36. Southwest wind 7 to 9 mph.

    Low: 36 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 50. Southwest wind 6 to 13 mph.

    High: 50 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 56.

    High: 56 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain likely after 2am. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.

    Low: 45 °F

    Mostly Cloudy
    then Rain
    Likely

  • Friday

    Friday: Rain likely, mainly before 8am. Partly sunny, with a high near 54. Chance of precipitation is 60%.

    High: 54 °F

    Rain Likely

Detailed Forecast

This Afternoon
A chance of rain before 2pm, then a slight chance of showers after 2pm. Cloudy, with a high near 43. North wind around 10 mph. Chance of precipitation is 50%.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Wind chill values between 25 and 30. Northwest wind 10 to 14 mph.
Tuesday
Sunny, with a high near 46. Wind chill values between 25 and 35 early. North wind 6 to 10 mph becoming west in the afternoon.
Tuesday Night
Increasing clouds, with a low around 36. Southwest wind 7 to 9 mph.
Wednesday
Partly sunny, with a high near 50. Southwest wind 6 to 13 mph.
Wednesday Night
Mostly cloudy, with a low around 41.
Thursday
Mostly cloudy, with a high near 56.
Thursday Night
Rain likely after 2am. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.
Friday
Rain likely, mainly before 8am. Partly sunny, with a high near 54. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 29.
Saturday
Mostly sunny, with a high near 42.
Saturday Night
Mostly clear, with a low around 31.
Sunday
Sunny, with a high near 47.
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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:
2:12 am EDT Mar 23, 2026
Forecast Valid:
12pm EDT Mar 23, 2026-6pm EDT Mar 29, 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