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.

Overcast

76°F

24°C

Humidity 97%
Wind Speed S 16 G 26 mph
Barometer 29.77 in (1007.9 mb)
Dewpoint 75°F (24°C)
Visibility 7.00 mi
Heat Index75°F (24°C)
Last update 3 Aug 3:56 am EDT
Extended Forecast for

Lake Ronkonkoma NY

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Low around 74. South wind around 17 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 74 °F

    Showers

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 81. South wind around 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 81 °F

    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 65. West wind 6 to 9 mph becoming north after midnight.

    Low: 65 °F

    Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83. North wind around 6 mph becoming south in the afternoon.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 66. Light south wind.

    Low: 66 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers before 2pm. Partly sunny, with a high near 83.

    High: 83 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 2am. Partly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    Showers

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Low around 74. South wind around 17 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Showers and possibly a thunderstorm. High near 81. South wind around 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
A 30 percent chance of showers and thunderstorms before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 65. West wind 6 to 9 mph becoming north after midnight.
Tuesday
Mostly sunny, with a high near 83. North wind around 6 mph becoming south in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 66. Light south wind.
Wednesday
A 30 percent chance of showers before 2pm. Partly sunny, with a high near 83.
Wednesday Night
Mostly cloudy, with a low around 71.
Thursday
Mostly sunny, with a high near 86.
Thursday Night
A 30 percent chance of showers before 2am. Partly cloudy, with a low around 73.
Friday
Mostly sunny, with a high near 87.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 73.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 87.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 72.
Sunday
Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Ronkonkoma NY
 40.83°N 73.11°W (Elev. 98 ft)
Last Update:
2:12 am EDT Aug 3, 2026
Forecast Valid:
4am EDT Aug 3, 2026-6pm EDT Aug 9, 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