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.

Mostly Cloudy

78°F

26°C

Humidity 60%
Wind Speed NW 9 mph
Barometer 30.05 in (1017.3 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 18 Sep 12:56 pm EDT
Extended Forecast for

Central Islip NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 80. North wind around 10 mph, with gusts as high as 20 mph.

    High: 80 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 55. Northeast wind 6 to 10 mph.

    Low: 55 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 70. Northeast wind 7 to 10 mph.

    High: 70 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 57. Southeast wind around 6 mph.

    Low: 57 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers, mainly after 2pm. High near 71. South wind 7 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 71 °F

    Slight Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: Showers. Low around 60. Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.

    Low: 60 °F

    Showers

  • Monday

    Monday: Showers likely, mainly before 8am. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 65.

    High: 65 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 80. North wind around 10 mph, with gusts as high as 20 mph.
Tonight
Partly cloudy, with a low around 55. Northeast wind 6 to 10 mph.
Saturday
Mostly sunny, with a high near 70. Northeast wind 7 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 57. Southeast wind around 6 mph.
Sunday
Showers, mainly after 2pm. High near 71. South wind 7 to 13 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Showers. Low around 60. Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.
Monday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 56.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 65.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 54.
Wednesday
A 30 percent chance of showers. Mostly cloudy, with a high near 65. Breezy.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 54.
Thursday
A 30 percent chance of showers. Partly sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Central Islip NY
 40.77°N 73.21°W (Elev. 49 ft)
Last Update:
11:03 am EDT Sep 18, 2026
Forecast Valid:
1pm EDT Sep 18, 2026-6pm EDT Sep 24, 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