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.

A Few Clouds

61°F

16°C

Humidity 43%
Wind Speed NE 14 mph
Barometer 30.40 in (1029.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 19 Oct 12:56 pm EDT
Extended Forecast for

2 Miles NE Port Jefferson NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 62. Northeast wind 9 to 11 mph.

    High: 62 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. North wind 13 to 18 mph.

    Low: 54 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65. Breezy, with a northeast wind 16 to 22 mph.

    High: 65 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52. Windy, with a northeast wind 17 to 22 mph increasing to 23 to 28 mph after midnight.

    Low: 52 °F

    Partly Cloudy
    and Windy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 61. Windy, with a northeast wind 21 to 26 mph decreasing to 15 to 20 mph in the afternoon.

    High: 61 °F

    Sunny and
    Windy then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 50. Breezy.

    Low: 50 °F

    Partly Cloudy
    and Breezy

  • Thursday

    Thursday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 52. Breezy.

    Low: 52 °F

    Mostly Clear
    and Breezy

  • Friday

    Friday: Sunny, with a high near 59. Breezy.

    High: 59 °F

    Sunny and
    Breezy then
    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 62. Northeast wind 9 to 11 mph.
Tonight
Mostly cloudy, with a low around 54. North wind 13 to 18 mph.
Tuesday
Mostly cloudy, with a high near 65. Breezy, with a northeast wind 16 to 22 mph.
Tuesday Night
Partly cloudy, with a low around 52. Windy, with a northeast wind 17 to 22 mph increasing to 23 to 28 mph after midnight.
Wednesday
Mostly sunny, with a high near 61. Windy, with a northeast wind 21 to 26 mph decreasing to 15 to 20 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 50. Breezy.
Thursday
Sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 52. Breezy.
Friday
Sunny, with a high near 59. Breezy.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 58.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NE Port Jefferson NY
 40.97°N 73.02°W (Elev. 0 ft)
Last Update:
5:21 am EDT Oct 19, 2026
Forecast Valid:
1pm EDT Oct 19, 2026-6pm EDT Oct 25, 2026
 
Forecast Discussion
 
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Additional Resources

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