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.

Overcast

48°F

9°C

Humidity 93%
Wind Speed Calm
Barometer 29.71 in (1006.1 mb)
Dewpoint 46°F (8°C)
Visibility 8.00 mi
Last update 22 Mar 4:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: A 40 percent chance of rain. Mostly cloudy, with a high near 54. South wind around 8 mph.

    High: 54 °F

    Chance Rain

  • Tonight

    Tonight: Rain. Low around 38. South wind around 6 mph becoming light and variable. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 38 °F

    Rain

  • Monday

    Monday: Rain, mainly before 11am. High near 47. North wind around 11 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 47 °F

    Rain then
    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 32. Wind chill values between 25 and 30. Northwest wind 10 to 13 mph.

    Low: 32 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 46. North wind 6 to 10 mph becoming southwest in the afternoon.

    High: 46 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 35.

    Low: 35 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
A 40 percent chance of rain. Mostly cloudy, with a high near 54. South wind around 8 mph.
Tonight
Rain. Low around 38. South wind around 6 mph becoming light and variable. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
Rain, mainly before 11am. High near 47. North wind around 11 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday Night
Partly cloudy, with a low around 32. Wind chill values between 25 and 30. Northwest wind 10 to 13 mph.
Tuesday
Sunny, with a high near 46. North wind 6 to 10 mph becoming southwest in the afternoon.
Tuesday Night
Increasing clouds, with a low around 35.
Wednesday
Partly sunny, with a high near 51.
Wednesday Night
Mostly cloudy, with a low around 39.
Thursday
Mostly cloudy, with a high near 54.
Thursday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Friday
Rain likely. Partly sunny, with a high near 53. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 28.
Saturday
Sunny, with a high near 42.
Saturday Night
Mostly clear, with a low around 31.
Sunday
Mostly sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Stony Brook NY
 40.92°N 73.15°W (Elev. 36 ft)
Last Update:
3:49 pm EDT Mar 22, 2026
Forecast Valid:
5pm EDT Mar 22, 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