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.

Partly Cloudy and Breezy

44°F

7°C

Humidity 34%
Wind Speed W 23 G 39 mph
Barometer 29.88 in (1012.0 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 28 Nov 12:56 pm EST
Extended Forecast for

Ronkonkoma NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 46. Windy, with a west wind around 26 mph, with gusts as high as 43 mph.

    High: 46 °F

    Mostly Sunny
    and Windy

  • Tonight

    Tonight: Mostly clear, with a low around 31. Wind chill values between 25 and 30. Breezy, with a west wind 14 to 20 mph, with gusts as high as 37 mph.

    Low: 31 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Saturday

    Saturday: Sunny, with a high near 45. Wind chill values between 25 and 35 early. Northwest wind 9 to 14 mph.

    High: 45 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 33. Calm wind becoming south around 6 mph after midnight.

    Low: 33 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers likely, mainly after 1pm. Cloudy, with a high near 54. South wind 9 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 54 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers before 1am, then a chance of sprinkles after 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35. Chance of precipitation is 50%.

    Low: 35 °F

    Chance
    Showers

  • Monday

    Monday: A chance of flurries before 7am. Mostly sunny, with a high near 45.

    High: 45 °F

    Chance
    Flurries

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Rain likely, mainly after 1pm. Cloudy, with a high near 47. Chance of precipitation is 60%.

    High: 47 °F

    Rain Likely

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 46. Windy, with a west wind around 26 mph, with gusts as high as 43 mph.
Tonight
Mostly clear, with a low around 31. Wind chill values between 25 and 30. Breezy, with a west wind 14 to 20 mph, with gusts as high as 37 mph.
Saturday
Sunny, with a high near 45. Wind chill values between 25 and 35 early. Northwest wind 9 to 14 mph.
Saturday Night
Increasing clouds, with a low around 33. Calm wind becoming south around 6 mph after midnight.
Sunday
Showers likely, mainly after 1pm. Cloudy, with a high near 54. South wind 9 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A chance of showers before 1am, then a chance of sprinkles after 1am. Cloudy, then gradually becoming partly cloudy, with a low around 35. Chance of precipitation is 50%.
Monday
A chance of flurries before 7am. Mostly sunny, with a high near 45.
Monday Night
Mostly cloudy, with a low around 31.
Tuesday
Rain likely, mainly after 1pm. Cloudy, with a high near 47. Chance of precipitation is 60%.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 32.
Wednesday
Mostly sunny, with a high near 43.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Mostly cloudy, with a high near 45.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
1:12 am EST Nov 28, 2025
Forecast Valid:
1pm EST Nov 28, 2025-6pm EST Dec 4, 2025
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation