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

28°F

-2°C

Humidity 29%
Wind Speed N 7 mph
Barometer 30.27 in (1024.9 mb)
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 8 Dec 5:56 pm EST
Extended Forecast for

Saint James NY

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 16. Wind chill values between 10 and 15. North wind 5 to 9 mph becoming light after midnight.

    Low: 16 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 37. Wind chill values between 15 and 25. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 37 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of snow before 1am. Mostly cloudy, with a temperature rising to around 35 by 10pm. Southwest wind 7 to 10 mph, with gusts as high as 23 mph.

    Low: 32 °F⇑

    Slight Chance
    Snow

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 47. Southwest wind 9 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 47 °F

    Slight Chance
    Rain then
    Rain Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 33. Southwest wind 10 to 13 mph, with gusts as high as 29 mph.

    Low: 33 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 16. Wind chill values between 10 and 15. North wind 5 to 9 mph becoming light after midnight.
Tuesday
Increasing clouds, with a high near 37. Wind chill values between 15 and 25. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
A 20 percent chance of snow before 1am. Mostly cloudy, with a temperature rising to around 35 by 10pm. Southwest wind 7 to 10 mph, with gusts as high as 23 mph.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 47. Southwest wind 9 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 33. Southwest wind 10 to 13 mph, with gusts as high as 29 mph.
Thursday
Mostly sunny, with a high near 41.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Mostly sunny, with a high near 37.
Friday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 25.
Saturday
A 30 percent chance of snow showers before 7am. Partly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Mostly sunny, with a high near 33.
Sunday Night
Mostly clear, with a low around 19.
Monday
Mostly sunny, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint James NY
 40.88°N 73.16°W (Elev. 148 ft)
Last Update:
5:06 pm EST Dec 8, 2025
Forecast Valid:
6pm EST Dec 8, 2025-6pm EST Dec 15, 2025
 
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