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.

Mostly Cloudy

38°F

3°C

Humidity 68%
Wind Speed SW 9 mph
Barometer 30.36 in (1028.0 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 24 Mar 11:56 pm EDT
Extended Forecast for

2 Miles NNW Stony Brook NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 31. Southwest wind around 8 mph.

    Low: 31 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 51. West wind 5 to 8 mph.

    High: 51 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 39. South wind around 9 mph.

    Low: 39 °F

    Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 60. South wind 9 to 15 mph.

    High: 60 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain, mainly after 2am. Low around 47. South wind around 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 47 °F

    Slight Chance
    Rain then
    Rain

  • Friday

    Friday: Rain likely, mainly before 8am. Mostly cloudy, with a high near 55. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 55 °F

    Rain Likely
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 31. Southwest wind around 8 mph.
Wednesday
Partly sunny, with a high near 51. West wind 5 to 8 mph.
Wednesday Night
Cloudy, with a low around 39. South wind around 9 mph.
Thursday
Mostly cloudy, with a high near 60. South wind 9 to 15 mph.
Thursday Night
Rain, mainly after 2am. Low around 47. South wind around 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain likely, mainly before 8am. Mostly cloudy, with a high near 55. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Partly cloudy, with a low around 29.
Saturday
Sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 32.
Sunday
Sunny, with a high near 48.
Sunday Night
Partly cloudy, with a low around 37.
Monday
Partly sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Partly sunny, with a high near 55.
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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:
7:09 pm EDT Mar 24, 2026
Forecast Valid:
1am EDT Mar 25, 2026-6pm EDT Mar 31, 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