National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fog/Mist

39°F

4°C

Humidity 96%
Wind Speed S 7 mph
Barometer 30.01 in (1016.3 mb)
Dewpoint 38°F (3°C)
Visibility 3.00 mi
Wind Chill34°F (1°C)
Last update 10 Mar 2:56 am EDT
Extended Forecast for

Nissequogue NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 63. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 63 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 41. South wind around 6 mph becoming calm after midnight.

    Low: 41 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 60. Light southeast wind becoming south 5 to 9 mph in the morning.

    High: 60 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of rain after 2am. Mostly cloudy, with a low around 49. Southwest wind 11 to 13 mph. Chance of precipitation is 50%.

    Low: 49 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of rain before 5pm, then a chance of rain and snow. Mostly cloudy, with a temperature falling to around 43 by 5pm. Chance of precipitation is 50%.

    High: 50 °F⇓

    Chance Rain
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 31.

    Low: 31 °F

    Chance Snow
    then Mostly
    Clear

  • Friday

    Friday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 42. Calm wind.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 63. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 41. South wind around 6 mph becoming calm after midnight.
Wednesday
Partly sunny, with a high near 60. Light southeast wind becoming south 5 to 9 mph in the morning.
Wednesday Night
A chance of rain before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of rain after 2am. Mostly cloudy, with a low around 49. Southwest wind 11 to 13 mph. Chance of precipitation is 50%.
Thursday
A chance of rain before 5pm, then a chance of rain and snow. Mostly cloudy, with a temperature falling to around 43 by 5pm. Chance of precipitation is 50%.
Thursday Night
A 30 percent chance of snow before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 31.
Friday
Mostly sunny, with a high near 46.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
Mostly sunny, with a high near 48.
Saturday Night
Mostly cloudy, with a low around 35.
Sunday
Cloudy, with a high near 51.
Sunday Night
Rain. Low around 41. Chance of precipitation is 90%.
Monday
Rain. High near 52. Chance of precipitation is 80%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nissequogue NY
 40.9°N 73.18°W (Elev. 7 ft)
Last Update:
2:07 am EDT Mar 10, 2026
Forecast Valid:
3am EDT Mar 10, 2026-6pm EDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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