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.

Fog/Mist

51°F

11°C

Humidity 96%
Wind Speed S 7 mph
Barometer 29.61 in (1002.4 mb)
Dewpoint 50°F (10°C)
Visibility 5.00 mi
Wind Chill48°F (9°C)
Last update 12 Mar 2:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 40 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 49. Southwest wind around 9 mph.

    Low: 49 °F

    Chance Rain
    and Patchy
    Fog

  • Thursday

    Thursday: Rain before 3pm, then snow, possibly mixed with rain. Patchy fog before 7am. Temperature rising to near 54 by 8am, then falling to around 39 during the remainder of the day. Breezy, with a northwest wind 15 to 24 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 54 °F⇓

    Rain and
    Patchy Fog
    then
    Rain/Snow and
    Breezy

  • Thursday Night

    Thursday Night: 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.

    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

Detailed Forecast

Overnight
A 40 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 49. Southwest wind around 9 mph.
Thursday
Rain before 3pm, then snow, possibly mixed with rain. Patchy fog before 7am. Temperature rising to near 54 by 8am, then falling to around 39 during the remainder of the day. Breezy, with a northwest wind 15 to 24 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Thursday Night
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.
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. 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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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
2:50 am EDT Mar 12, 2026
Forecast Valid:
3am EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
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