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.

Fair

34°F

1°C

Humidity 70%
Wind Speed S 3 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 7 Nov 12:56 am EST
Extended Forecast for

Lake Ronkonkoma NY

Frost Advisory until November 7, 08:00am
Click here for hazard details and duration
Frost Advisory
  •  
    Frost Advisory until November 7, 08:00am

    NOW until 8:00am Fri

    Frost Advisory

  • Overnight

    Low: 34 °F

    Areas Frost

  • Friday

    Friday: Areas of frost before 7am. Otherwise, partly sunny, with a high near 61. Light south wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 30 mph.

    High: 61 °F

    Areas Frost
    then Partly
    Sunny

  • Friday Night

    Friday Night: Showers, mainly between 10pm and 4am. Steady temperature around 56. South wind 8 to 14 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 56 °F

    Showers

  • Saturday

    Saturday: A 30 percent chance of showers before 10am. Mostly cloudy, then gradually becoming sunny, with a high near 65. West wind 7 to 9 mph.

    High: 65 °F

    Chance
    Showers then
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 45. Northwest wind around 5 mph becoming light and variable.

    Low: 45 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain likely after 1pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °F

    Mostly Cloudy
    then Rain
    Likely

  • Sunday Night

    Sunday Night: Rain. Low around 47. Chance of precipitation is 80%.

    Low: 47 °F

    Rain

  • Monday

    Monday: A 40 percent chance of showers before 1pm. Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance
    Showers

Detailed Forecast

Overnight
Areas of frost after 4am. Otherwise, partly cloudy, with a low around 34. Calm wind.
Friday
Areas of frost before 7am. Otherwise, partly sunny, with a high near 61. Light south wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 30 mph.
Friday Night
Showers, mainly between 10pm and 4am. Steady temperature around 56. South wind 8 to 14 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A 30 percent chance of showers before 10am. Mostly cloudy, then gradually becoming sunny, with a high near 65. West wind 7 to 9 mph.
Saturday Night
Partly cloudy, with a low around 45. Northwest wind around 5 mph becoming light and variable.
Sunday
Rain likely after 1pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Rain. Low around 47. Chance of precipitation is 80%.
Monday
A 40 percent chance of showers before 1pm. Mostly cloudy, with a high near 55.
Monday Night
Partly cloudy, with a low around 33.
Veterans Day
Mostly sunny, with a high near 47.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 53.
Wednesday Night
Partly cloudy, with a low around 41.
Thursday
Mostly sunny, with a high near 53.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Ronkonkoma NY
 40.83°N 73.14°W (Elev. 98 ft)
Last Update:
1:33 am EST Nov 7, 2025
Forecast Valid:
1am EST Nov 7, 2025-6pm EST Nov 13, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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