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 Rain

57°F

14°C

Humidity 93%
Wind Speed N 15 G 22 mph
Barometer 29.81 in (1009.4 mb)
Dewpoint 55°F (13°C)
Visibility 8.00 mi
Last update 11 Oct 11:56 pm EDT
Extended Forecast for

Nissequogue NY

  • Overnight

    Overnight: A 50 percent chance of rain and thunderstorms. Cloudy, with a low around 56. Northeast wind around 16 mph.

    Low: 56 °F

    Chance Rain

  • Columbus Day

    Columbus Day: Cloudy through mid morning, then gradual clearing, with a high near 70. North wind 6 to 13 mph.

    High: 70 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 57. Northwest wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 70. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 70 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 63. Southwest wind 9 to 11 mph. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
A 50 percent chance of rain and thunderstorms. Cloudy, with a low around 56. Northeast wind around 16 mph.
Columbus Day
Cloudy through mid morning, then gradual clearing, with a high near 70. North wind 6 to 13 mph.
Monday Night
Mostly clear, with a low around 57. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 70. Light and variable wind becoming south 5 to 8 mph in the morning.
Tuesday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 63. Southwest wind 9 to 11 mph. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 75.
Wednesday Night
Mostly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 51.
Friday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 48. Breezy.
Saturday
Partly sunny, with a high near 56. Breezy.
Saturday Night
Mostly cloudy, with a low around 39. Breezy.
Sunday
Mostly sunny, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Nissequogue NY
 40.9°N 73.18°W (Elev. 7 ft)
Last Update:
3:33 pm EDT Oct 11, 2026
Forecast Valid:
12am EDT Oct 12, 2026-6pm EDT Oct 18, 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