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.

Fog/Mist

47°F

8°C

Humidity 100%
Wind Speed S 6 mph
Barometer 29.54 in (1000.4 mb)
Dewpoint 47°F (8°C)
Visibility 2.50 mi
Wind Chill44°F (7°C)
Last update 12 Mar 5:56 am EDT
Extended Forecast for

Ronkonkoma NY

  • Today

    Today: Rain before 3pm, then snow, possibly mixed with rain. Patchy fog before 7am. Temperature falling to around 39 by 5pm. Breezy, with a south wind 8 to 13 mph becoming northwest 19 to 24 mph in the morning. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.

    High: 52 °F⇓

    Chance Rain
    and Patchy
    Fog then
    Rain/Snow and
    Breezy

  • Tonight

    Tonight: Snow, possibly mixed with rain before 8pm. Low around 29. Northwest wind 9 to 11 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 45. Wind chill values between 25 and 35 early. West wind 5 to 10 mph becoming south 12 to 17 mph in the afternoon.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind 14 to 16 mph, with gusts as high as 26 mph.

    Low: 36 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 50. West wind 15 to 17 mph, with gusts as high as 28 mph.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, with a high near 47.

    High: 47 °F

    Cloudy

  • Sunday Night

    Sunday Night: Rain, mainly after 2am. Low around 41. Chance of precipitation is 80%.

    Low: 41 °F

    Chance Rain
    then Rain

  • Monday

    Monday: Rain. High near 57. Breezy. Chance of precipitation is 90%.

    High: 57 °F

    Rain and
    Breezy

Detailed Forecast

Today
Rain before 3pm, then snow, possibly mixed with rain. Patchy fog before 7am. Temperature falling to around 39 by 5pm. Breezy, with a south wind 8 to 13 mph becoming northwest 19 to 24 mph in the morning. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Snow, possibly mixed with rain before 8pm. Low around 29. Northwest wind 9 to 11 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Friday
Increasing clouds, with a high near 45. Wind chill values between 25 and 35 early. West wind 5 to 10 mph becoming south 12 to 17 mph in the afternoon.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 36. South wind 14 to 16 mph, with gusts as high as 26 mph.
Saturday
Sunny, with a high near 50. West wind 15 to 17 mph, with gusts as high as 28 mph.
Saturday Night
Increasing clouds, with a low around 32.
Sunday
Cloudy, with a high near 47.
Sunday Night
Rain, mainly after 2am. Low around 41. Chance of precipitation is 80%.
Monday
Rain. High near 57. Breezy. Chance of precipitation is 90%.
Monday Night
Rain likely, mainly before 2am. Mostly cloudy, with a low around 34. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 41.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
6:12 am EDT Mar 12, 2026
Forecast Valid:
6am EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation