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

35°F

2°C

Humidity 57%
Wind Speed Calm
Barometer 30.06 in (1018.0 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 17 Jan 6:56 am EST
Extended Forecast for

5 Miles SSE Blue Point NY

  • Today

    Today: Rain likely, mainly between 1pm and 4pm. Mostly cloudy, with a high near 43. Southwest wind 16 to 18 mph. Chance of precipitation is 60%.

    High: 43 °F

    Slight Chance
    Rain then
    Rain Likely

  • Tonight

    Tonight: A chance of rain before 7pm, then a chance of rain after 4am. Mostly cloudy, with a low around 33. West wind 6 to 14 mph. Chance of precipitation is 30%.

    Low: 33 °F

    Chance Rain

  • Sunday

    Sunday: Snow likely, possibly mixed with rain, becoming all snow after 4pm. Cloudy, with a high near 37. West wind 6 to 10 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

    High: 37 °F

    Rain/Snow
    Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 27. Wind chill values between 15 and 25. Northwest wind 11 to 14 mph.

    Low: 27 °F

    Chance Snow

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 35. Breezy, with a west wind 17 to 25 mph.

    High: 35 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 20. Windy.

    Low: 20 °F

    Partly Cloudy
    and Windy

  • Tuesday

    Tuesday: Sunny, with a high near 25. Breezy.

    High: 25 °F

    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 20. Breezy.

    Low: 20 °F

    Mostly Clear
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. Breezy.

    High: 38 °F

    Sunny then
    Partly Sunny
    and Breezy

Detailed Forecast

Today
Rain likely, mainly between 1pm and 4pm. Mostly cloudy, with a high near 43. Southwest wind 16 to 18 mph. Chance of precipitation is 60%.
Tonight
A chance of rain before 7pm, then a chance of rain after 4am. Mostly cloudy, with a low around 33. West wind 6 to 14 mph. Chance of precipitation is 30%.
Sunday
Snow likely, possibly mixed with rain, becoming all snow after 4pm. Cloudy, with a high near 37. West wind 6 to 10 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
Sunday Night
A 30 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 27. Wind chill values between 15 and 25. Northwest wind 11 to 14 mph.
M.L.King Day
Mostly sunny, with a high near 35. Breezy, with a west wind 17 to 25 mph.
Monday Night
Partly cloudy, with a low around 20. Windy.
Tuesday
Sunny, with a high near 25. Breezy.
Tuesday Night
Mostly clear, with a low around 20. Breezy.
Wednesday
Mostly sunny, with a high near 38. Breezy.
Wednesday Night
Mostly cloudy, with a low around 34. Breezy.
Thursday
Partly sunny, with a high near 39.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Mostly sunny, with a high near 33.
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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:
4:17 am EST Jan 17, 2026
Forecast Valid:
7am EST Jan 17, 2026-6pm EST Jan 23, 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