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.

Overcast

63°F

17°C

Humidity 68%
Wind Speed NE 8 mph
Barometer 30.19 in (1022.3 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 4 Oct 1:56 pm EDT
Extended Forecast for

Sayville NY

  • This Afternoon

    This Afternoon: Showers, mainly after 5pm. Steady temperature around 60. East wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Showers

  • Tonight

    Tonight: Showers, mainly before 8pm. Low around 54. Northeast wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 54 °F

    Showers then
    Mostly Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 68. Breezy, with a northwest wind 6 to 11 mph increasing to 17 to 22 mph in the afternoon.

    High: 68 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Monday Night

    Monday Night: Clear, with a low around 44. Northwest wind 9 to 16 mph.

    Low: 44 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 61. Northwest wind around 9 mph.

    High: 61 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 45.

    Low: 45 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

Detailed Forecast

This Afternoon
Showers, mainly after 5pm. Steady temperature around 60. East wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Showers, mainly before 8pm. Low around 54. Northeast wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Partly sunny, then gradually becoming sunny, with a high near 68. Breezy, with a northwest wind 6 to 11 mph increasing to 17 to 22 mph in the afternoon.
Monday Night
Clear, with a low around 44. Northwest wind 9 to 16 mph.
Tuesday
Sunny, with a high near 61. Northwest wind around 9 mph.
Tuesday Night
Clear, with a low around 45.
Wednesday
Sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
Sunny, with a high near 70.
Thursday Night
Mostly clear, with a low around 56.
Friday
Sunny, with a high near 68.
Friday Night
Mostly clear, with a low around 54.
Saturday
Sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.76°N 73.09°W (Elev. 49 ft)
Last Update:
2:27 pm EDT Oct 4, 2026
Forecast Valid:
2pm EDT Oct 4, 2026-6pm EDT Oct 10, 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