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.

Fair

52°F

11°C

Humidity 72%
Wind Speed SW 13 mph
Barometer 30.12 in (1019.8 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 13 May 12:56 am EDT
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 50. Southwest wind around 10 mph.

    Low: 50 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 61. Breezy, with a south wind 14 to 19 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 38 mph.

    High: 61 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers likely, mainly after 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 53. Breezy, with a south wind 10 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 53 °F

    Chance
    Showers and
    Breezy then
    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: Showers and possibly a thunderstorm. Patchy fog. High near 63. Southeast wind 5 to 8 mph becoming calm in the morning. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 63 °F

    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 50. Northwest wind 3 to 7 mph. Chance of precipitation is 60%.

    Low: 50 °F

    Showers
    Likely

  • Friday

    Friday: A 40 percent chance of showers before 2pm. Partly sunny, with a high near 65.

    High: 65 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 50. Southwest wind around 10 mph.
Wednesday
Mostly cloudy, with a high near 61. Breezy, with a south wind 14 to 19 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 38 mph.
Wednesday Night
Showers likely, mainly after 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 53. Breezy, with a south wind 10 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Showers and possibly a thunderstorm. Patchy fog. High near 63. Southeast wind 5 to 8 mph becoming calm in the morning. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 50. Northwest wind 3 to 7 mph. Chance of precipitation is 60%.
Friday
A 40 percent chance of showers before 2pm. Partly sunny, with a high near 65.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Sunny, with a high near 69.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Sunny, with a high near 74.
Sunday Night
Partly cloudy, with a low around 56.
Monday
Mostly sunny, with a high near 70.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.73°N 73.07°W (Elev. 16 ft)
Last Update:
2:36 pm EDT May 12, 2026
Forecast Valid:
1am EDT May 13, 2026-6pm EDT May 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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