Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

45°F

7°C

Humidity 42%
Wind Speed NW 12 mph
Barometer 30.14 in (1020.7 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 18 Nov 9:56 am EST
Extended Forecast for

Ronkonkoma NY

  • Today

    Today: Mostly sunny, with a high near 48. West wind 11 to 14 mph.

    High: 48 °F

    Mostly Sunny

  • Tonight

    Tonight: A 40 percent chance of rain after 1am.  Increasing clouds, with a low around 37. West wind 5 to 7 mph becoming calm  in the evening.

    Low: 37 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: A 20 percent chance of rain before 1pm.  Cloudy, then gradually becoming mostly sunny, with a high near 51. Calm wind becoming north around 6 mph in the morning.

    High: 51 °F

    Slight Chance
    Rain

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37. Calm wind becoming north around 5 mph after midnight.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 52. Northeast wind around 7 mph.

    High: 52 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of rain.  Mostly cloudy, with a high near 58.

    High: 58 °F

    Chance Rain

  • Friday Night

    Friday Night: A 30 percent chance of rain.  Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 53.

    High: 53 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 48. West wind 11 to 14 mph.
Tonight
A 40 percent chance of rain after 1am. Increasing clouds, with a low around 37. West wind 5 to 7 mph becoming calm in the evening.
Wednesday
A 20 percent chance of rain before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 51. Calm wind becoming north around 6 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 37. Calm wind becoming north around 5 mph after midnight.
Thursday
Partly sunny, with a high near 52. Northeast wind around 7 mph.
Thursday Night
Mostly cloudy, with a low around 43.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 58.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 42.
Saturday
Partly sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 36.
Sunday
Mostly sunny, with a high near 53.
Sunday Night
Partly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 55.
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ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
5:29 am EST Nov 18, 2025
10am EST Nov 18, 2025-6pm EST Nov 24, 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