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.

Mostly Cloudy

63°F

17°C

Humidity 68%
Wind Speed E 6 mph
Barometer 30.17 in (1021.6 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 19 Sep 6:56 pm EDT
Extended Forecast for

5 Miles SE West Sayville NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 64. Southeast wind around 14 mph.

    Low: 64 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers before 5pm, then rain likely after 5pm. Mostly cloudy, with a high near 72. Breezy, with a southeast wind 15 to 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 72 °F

    Rain Likely
    and Breezy

  • Sunday Night

    Sunday Night: Rain likely before 8pm, then showers, mainly between 8pm and 2am. Low around 63. Breezy, with a south wind 17 to 21 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Showers and
    Breezy

  • Monday

    Monday: A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 68. Breezy, with a northeast wind 18 to 25 mph.

    High: 68 °F

    Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: A chance of showers before 8pm, then a chance of showers after 2am. Mostly cloudy, with a low around 61. Breezy, with a northeast wind 17 to 24 mph. Chance of precipitation is 30%.

    Low: 61 °F

    Chance
    Showers and
    Breezy

  • Tuesday

    Tuesday: A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 65. Windy.

    High: 65 °F

    Chance
    Showers and
    Windy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 60. Windy.

    Low: 60 °F

    Mostly Cloudy
    and Windy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 65. Windy.

    High: 65 °F

    Mostly Cloudy
    and Windy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 60. Windy.

    Low: 60 °F

    Windy. Mostly
    Cloudy then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 64. Southeast wind around 14 mph.
Sunday
A chance of showers before 5pm, then rain likely after 5pm. Mostly cloudy, with a high near 72. Breezy, with a southeast wind 15 to 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Rain likely before 8pm, then showers, mainly between 8pm and 2am. Low around 63. Breezy, with a south wind 17 to 21 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 68. Breezy, with a northeast wind 18 to 25 mph.
Monday Night
A chance of showers before 8pm, then a chance of showers after 2am. Mostly cloudy, with a low around 61. Breezy, with a northeast wind 17 to 24 mph. Chance of precipitation is 30%.
Tuesday
A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 65. Windy.
Tuesday Night
Mostly cloudy, with a low around 60. Windy.
Wednesday
Mostly cloudy, with a high near 65. Windy.
Wednesday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 60. Windy.
Thursday
A 40 percent chance of showers. Mostly cloudy, with a high near 65. Windy.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 59. Windy.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 65. Windy.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 60. Windy.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 67. Windy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SE West Sayville NY
 40.67°N 73.06°W (Elev. 0 ft)
Last Update:
2:28 pm EDT Sep 19, 2026
Forecast Valid:
7pm EDT Sep 19, 2026-6pm EDT Sep 26, 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