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

42°F

6°C

Humidity 38%
Wind Speed NW 12 mph
Barometer 30.45 in (1031.2 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 29 Nov 3:56 pm EST
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Increasing clouds, with a low around 31. Calm wind becoming south around 6 mph after midnight.

    Low: 31 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain, mainly after 1pm. High near 52. South wind 9 to 16 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 34. West wind 11 to 13 mph, with gusts as high as 23 mph.

    Low: 34 °F

    Slight Chance
    Rain then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 43. Northwest wind 9 to 14 mph.

    High: 43 °F

    Sunny

  • Monday Night

    Monday Night: A 50 percent chance of rain after 4am. Increasing clouds, with a low around 30. North wind around 5 mph becoming light and variable in the evening.

    Low: 30 °F

    Partly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: Rain, mainly after 7am. High near 45. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

    High: 45 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain likely before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Chance of precipitation is 60%.

    Low: 31 °F

    Rain Likely

  • Wednesday

    Wednesday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 31. Calm wind becoming south around 6 mph after midnight.
Sunday
Rain, mainly after 1pm. High near 52. South wind 9 to 16 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 20 percent chance of rain before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 34. West wind 11 to 13 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 43. Northwest wind 9 to 14 mph.
Monday Night
A 50 percent chance of rain after 4am. Increasing clouds, with a low around 30. North wind around 5 mph becoming light and variable in the evening.
Tuesday
Rain, mainly after 7am. High near 45. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Tuesday Night
Rain likely before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Chance of precipitation is 60%.
Wednesday
Sunny, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 23.
Friday
Partly sunny, with a high near 39.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 28.
Saturday
A 30 percent chance of rain. Mostly cloudy, with a high near 41.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:12 pm EST Nov 29, 2025
Forecast Valid:
4pm EST Nov 29, 2025-6pm EST Dec 6, 2025
 
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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