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.

Fog

44°F

7°C

Humidity 96%
Wind Speed NW 7 mph
Barometer 29.80 in (1009.0 mb)
Dewpoint 43°F (6°C)
Visibility 0.13 mi
Wind Chill40°F (4°C)
Last update 21 Mar 7:56 am EDT
Extended Forecast for

5 Miles SSE Blue Point NY

  • Today

    Today: Sunny, with a high near 47. North wind 8 to 14 mph.

    High: 47 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 39. Northeast wind 5 to 8 mph becoming southeast after midnight.

    Low: 39 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A 20 percent chance of rain after 2pm. Mostly cloudy, with a high near 48. Southwest wind 14 to 16 mph.

    High: 48 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain and thunderstorms likely, then rain after 11pm. Low around 39. Southwest wind 10 to 14 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 39 °F

    Rain

  • Monday

    Monday: Rain, mainly before 8am. High near 43. North wind 16 to 18 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 43 °F

    Rain then
    Chance Rain

  • Monday Night

    Monday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 41.

    High: 41 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 47. North wind 8 to 14 mph.
Tonight
Increasing clouds, with a low around 39. Northeast wind 5 to 8 mph becoming southeast after midnight.
Sunday
A 20 percent chance of rain after 2pm. Mostly cloudy, with a high near 48. Southwest wind 14 to 16 mph.
Sunday Night
Rain and thunderstorms likely, then rain after 11pm. Low around 39. Southwest wind 10 to 14 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
Rain, mainly before 8am. High near 43. North wind 16 to 18 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Sunny, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 45.
Wednesday Night
Mostly cloudy, with a low around 37.
Thursday
Mostly cloudy, with a high near 45.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 40. Windy.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 46. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Blue Point NY
 40.68°N 72.99°W (Elev. 0 ft)
Last Update:
2:34 am EDT Mar 21, 2026
Forecast Valid:
8am EDT Mar 21, 2026-6pm EDT Mar 27, 2026
 
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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