National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

79°F

26°C

Humidity 54%
Wind Speed NW 10 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 18 Sep 1:56 pm EDT
Extended Forecast for

5 Miles SSE Blue Point NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 78. North wind around 9 mph.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 58. Breezy, with a northeast wind 10 to 15 mph increasing to 16 to 21 mph after midnight.

    Low: 58 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Saturday

    Saturday: Partly sunny, with a high near 68. Breezy, with a northeast wind 11 to 20 mph.

    High: 68 °F

    Partly Sunny
    and Breezy
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 63. Southeast wind 11 to 13 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 70. South wind 14 to 17 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 70 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers. Low around 65. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

    Low: 65 °F

    Showers

  • Monday

    Monday: Showers likely, mainly before 8am. Mostly cloudy, with a high near 68. Breezy. Chance of precipitation is 60%.

    High: 68 °F

    Showers
    Likely and
    Breezy

  • Monday Night

    Monday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 62. Windy.

    Low: 62 °F

    Chance
    Showers and
    Windy

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 64. Windy.

    High: 64 °F

    Chance
    Showers and
    Windy

Detailed Forecast

This Afternoon
Sunny, with a high near 78. North wind around 9 mph.
Tonight
Partly cloudy, with a low around 58. Breezy, with a northeast wind 10 to 15 mph increasing to 16 to 21 mph after midnight.
Saturday
Partly sunny, with a high near 68. Breezy, with a northeast wind 11 to 20 mph.
Saturday Night
Increasing clouds, with a low around 63. Southeast wind 11 to 13 mph.
Sunday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 70. South wind 14 to 17 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Showers. Low around 65. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Monday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 68. Breezy. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 62. Windy.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 64. Windy.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 60. Windy.
Wednesday
A 30 percent chance of showers. Mostly cloudy, with a high near 65. Windy.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 60. Windy.
Thursday
A 30 percent chance of showers. Mostly cloudy, with a high near 66. Windy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Blue Point NY
 40.68°N 72.99°W (Elev. 0 ft)
Last Update:
11:03 am EDT Sep 18, 2026
Forecast Valid:
2pm EDT Sep 18, 2026-6pm EDT Sep 24, 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