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.

A Few Clouds

67°F

19°C

Humidity 22%
Wind Speed SW 14 G 22 mph
Barometer 30.03 in (1016.7 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 9 Mar 1:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 64. Southwest wind around 7 mph.

    High: 64 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 40. South wind 3 to 6 mph.

    Low: 40 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 65. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 65 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 41. South wind around 6 mph becoming calm in the evening.

    Low: 41 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: A 20 percent chance of showers. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 59. South wind 5 to 10 mph.

    High: 59 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance
    Showers

  • Thursday

    Thursday: Rain likely, mainly before 2pm. Mostly cloudy, with a high near 56. Chance of precipitation is 60%.

    High: 56 °F

    Rain Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before 8pm. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Chance Rain
    then Partly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 64. Southwest wind around 7 mph.
Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 40. South wind 3 to 6 mph.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 65. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 41. South wind around 6 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 59. South wind 5 to 10 mph.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 48.
Thursday
Rain likely, mainly before 2pm. Mostly cloudy, with a high near 56. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of rain before 8pm. Mostly cloudy, with a low around 31.
Friday
Mostly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain before 2am. Mostly cloudy, with a low around 36.
Saturday
Mostly sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 51.
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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:
2:19 pm EDT Mar 9, 2026
Forecast Valid:
2pm EDT Mar 9, 2026-6pm EDT Mar 15, 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